B. capsularis, testa cylindracea, frontis cirris binis pendulis, setaque caudali unica. Capsular brachionus, in a cylindric shell, with two long pendulous locks of hair proceeding from the front; the tail consists of a single bristle.
373. Brachionus Quadratus.
B. capsularis, testa quadrangula, apice bidentata, basi bicorni, cauda nulla. Capsular brachionus, in a quadrangular shell, with two small teeth at the apex, two horns proceeding from the base, and no tail.
374. Brachionus Impressus.
B. capsularis, testa quadrangula, apice integra, basi obtusi emarginata, cauda flexuosa. Capsular brachionus, the shell quadrangular, a smooth undivided apex; obtuse base; notched margin, and a flexuous tail.
375. Brachionus Urceolaris.
For a full description of this animalculum, being the same as the vorticella urceolaris, the reader will please to refer to [page 408]. Views of the animal in its different positions will be found in [Plate XXII.] Fig. 36, 37, 38, and in [Plate XXVII.] Fig. 56 and 57. Fig. 56, a a, are the two fibrillæ; b, the head; f, the intestines; i, the aperture from which the tail is protruded; i k, the tail; at the end, k, is a cleft, enabling the animal to affix itself more firmly to any substance. Fig. 57, at a c a, are seen the fibrillæ; d shews the moveable intestine, supposed to be the heart or lungs; f, the intestines; h i k, the tail.
376. Brachionus Bakeri.
B. capsularis, testa ventricosa, apice quadridentata, basi bicorni, cauda longa bicuspi. [Plate XXVII.] Fig. 58. Capsular brachionus, the shell ventricose, four teeth at the apex, two horns at the base, and a long tail terminating in two short points.
This differs considerably from the foregoing in the shape of the shell, from each side of which there is a curved projection, f f, inclining towards the tail, nearly of the same length with it, and terminating in a point, h h. The upper part also of the shell is of a different form, having in general four longer spiculæ, and two shorter ones. From the head two arms or branches, e e, are frequently extended; the circular end of each is furnished with a tuft of little hairs, which sometimes move in a vibratory manner, at other times have a rotatory motion. The eggs are either affixed to the tail, or the curved part of the shell; they have from one to five hanging from them. Müller has likewise discovered in this animalculum two small feelers, and a kind of tongue. a a, the rotatory organs; b, the tongue; c c, the feelers; d d, a ciliated part on the side of the shell; g, the heart or lungs; m k, the tail; at the extremity, k, two sharp points.