120 
CLASS III. 
well as suctorial mouths: [they are single animals, in short, and not 
colonies.| The projecting edges, usually named ribs (coste) which 
are beset with cilia, especially characterise this family : whence the 
German name Rippenquallen. Whether these vibratile cilia, which 
occasionally are so arranged as to form vibrating laminz, do really 
cause the progression of these animals, as is usually assumed, is in 
consequence of the objections raised by Merrens and by WILL 
(Hore Tergest. s. 8—13) exceedingly doubtful. 
The name Beroé given by Brown (Nat. Hist. of Jamaica) to the 
animal discovered by him in the middle of the last century, is 
borrowed from Mythology; it is that of one of the numerous 
daughters of Oceanus : 
Clioque et Beroé soror, Oceanitides ambo.— 
VIRGIL, Georgic. Lib. IV. 341. 
Comp. on this order: Rane, Etablissement de la Famille des Béroides et 
description de deux genres nouveaux qui lui appartiennent ; Mémoires de la 
Soc. d’Hist. nat. de Paris, Tom. Iv. 1828, pp. 166—173, Pl. 19, 20. 
Mertens Beobachtungen und Untersuchungen iiber die beroeartigen Aca- 
lephen, Mém. de UV Acad. imp. des sc. de St. Petersbourg, sc. physiq. sixitme 
série, Tom, 11. 1838, pp. 479—543, Taf. 1.—xim. (A copious extract may 
be found in Oxen’s Jsis, 1836, s. 311—321.) Lesson, Mém. sur la 
famille des Béroides, Ann. des Sc. nat. 2° série, Tom. vi. Zool. 1836, 
pp. 235—266. 
Family V. SBeroidea. (The characters of the order are those 
of the single family.) 
A) Stomach small. 
Cestum Lesurur. Body transverse, elongate, gelatinous, with 
ciliated margins. 
Sp. Cestum Veneris Lusurur Nouv. Bullet. de la soc. philom. Juin, 1813, 
Pl. v. (Recus. in Oxen’s Isis, 1817, s. 1505—1508, Tab. x11.) GUERIN, 
Iconogr. Zooph. Pl. 18, fig. 1. (after a drawing by LAURILLARD) in the 
Mediterranean, This girdle of Venus has the form of a band of more 
than five feet long, and full two inches high. In the thinner inferior edge 
is situated the oral aperture (opposite to the place assigned to it by 
LESUEUR in the thicker superior edge). In Cestwm Najadis Escouscu. 
Acal. Tab. 1. fig. 1, from the South-Sea, near the Line, two long tentacula 
beset with fine threads are present, which in the species from the 
Mediterranean are often, and in Cestum Amphitrites MurtEns (1.1. Tab. I.) 
are (always ?) wanting. 
The genus Lemniscus Quoy and Gaim. is probably founded on a detached 
piece of Cestum. 
