I.II.III.IV.V.
M. europæus, Atlantic City:
Left2663+3+
Right2764(+1?)4
M. bidens:
Landenæs16(5)543
Fæø16543
Udsire16654

In M. europæus the metacarpal of the third digit is much constricted in the middle. The shaft of the ulna is straight. Except in these particulars and the relatively small size of the whole pectoral limb, the latter appears not to differ materially from that of M. bidens. As shown above, the first digit in M. bidens consists of the metacarpal bone only, while in M. europæus a phalange is also present.

Dimensions of the skeleton of the Atlantic City specimen of M. europæus, No. 23846, U.S.N.M.

mm.
Length of the seven cervical vertebræa94
Length of first, second, and third cervical vertebræa45
Atlas:
Greatest breadth156
Greatest height103
Height of neural canal36
Greatest breadth across anterior articular facets96
Axis, greatest breadth144
Seventh cervical vertebra:
Greatest breadth80
Greatest height without inferior process117
Greatest length of centrum14
Greatest height of neural canal49
First thoracic vertebra:
Greatest height151
Greatest breadth136
Height of centrum37
Length of centrum21
Breadth of centrum (articular surface)48
Height of neural spine61
Height of neural canal53
Seventh thoracic vertebra:
Greatest height246
Greatest breadth116
Height of centrum35
Length of centrum69
Breadth of centrum46
Breadth between transverse processes66
Eighth thoracic vertebra:
Greatest height246
Greatest breadth (between transverse processes)142
Height of centrum39
Length of centrum73
Breadth of centrum47
First lumbar vertebra:
Greatest height263
Greatest breadth (between transverse processes)215
Height of centrum (anterior)43
Length of centrum83
Breadth of centrum53
First caudal vertebra:
Greatest height263
Greatest breadth (between transverse processes)207
Height of centrum (anterior)65
Length of centrum113
Breadth of centrum67
Seventh caudal vertebra:
Greatest height153
Greatest breadth87
Height of centrum (without hypapophysis)66
Length of centrum84
Breadth of centrum70
Length of last 10 caudal vertebræ285
Sternum:
Total length404
Length of manubrium165
Greatest breadth of manubrium134
Depth of anterior notch of manubrium37
Scapula:
Length247
Depth161
Length of acromionb44
Length of coracoid59
Humerus, length107
Radius, length110
Ulna, length100
Pelvic bones, length51

a Placed in contact. b From the inside, without the cartilaginous tip.

HISTORY OF THE ATLANTIC CITY SPECIMEN.

Regarding the finding of the Atlantic City specimen and its exterior and gross anatomy, nothing has been published except brief references by Sir William Turner in 1889[25] and Dr. Glover M. Allen in 1906,[26] taken from a newspaper report of a communication made by myself before the Biological Society of Washington in 1889. On that account a somewhat detailed statement regarding it will be made in this place.

This individual ([Pl. 41], figs. 1, 2) was a male, 12½ feet long. It was observed by the crew of life-saving station No. 28, near Atlantic City, New Jersey, on the afternoon of March 28, 1889. It had come inside the bar which skirts the coast at this point, and was apparently unable to find its way out. It was captured with some difficulty, after being wounded in the throat, and was dragged up on the beach near the station. Later in the day it was carried to the skating rink of Messrs. Johnson & McShea, at Atlantic City, where it was exhibited until Monday, April 1. On the next morning it was sent by express to Washington.

I examined it for the first time in Atlantic City on March 29. It was then lying on the floor of the skating rink in such a position that the under surfaces were concealed, and, as the teeth were not visible, I mistook it for a female. Upon its arrival in Washington, however, where it could be examined under more favorable circumstances, it proved to be a male. The following measurements were taken from the fresh specimen:

External dimensions of a specimen of M. europæus from Atlantic City, New Jersey.