(f.) Ovigerous frænum.

(g.) Ovarian branching tubes filling up the peduncle.

(h.) Outer integument of peduncle, lined by corium and muscles, continuous with the outer membrane (a) of the capitulum.

[3.] [Anelasma squalicola], Small portion of the outer integument of the peduncle, greatly magnified, exhibiting the natural lines of splitting, and showing that it is composed of several distinct portions or layers, which are displayed by the corners having been turned over. Three of the branching filaments, filled with pulpy corium, are given; the others have been cut off. The membrane (a) extends under (b), but not under the circular patches of membrane, (c, c.)

[4.] [Anelasma squalicola]. Mandibles, seen from the side towards the maxillæ.

[5.] [Anelasma squalicola]. Mandibles, seen from the side towards the labrum.

[6.] [Anelasma squalicola]. The right-hand, rudimentary cirrus, the third from the mouth.

[7.] [Anelasma squalicola]. Maxillæ. The thin horny apodeme, (a).

[8.] [Ibla Cumingii], female, (magnified four times.)

[8a´.] [Ibla Cumingii], female, (magnified about five times), with the right hand valves and right side of the peduncle removed. The Male (h) is seen attached in the sack. The peculiar form of the body, caused by the small development of the prosoma, by the distance of the first and second pairs of cirri, and by the distance of the mouth from the adductor muscle, (a dark dotted circle opposite i,) and lastly, the remarkable course of the œsophagus over the adductor muscle, together with the outline of the stomach, are here all exhibited.