74 AMERICAN JOURNAL 



Shell cylindrical, membranaceous, truncate posteriorly, much 

 convolute, covered with a thin yellowish epidermis ; aperture 

 small, not one-half the length of the shell. 



Animal white, pellucid, neck long ; head disk, elongate, tri- 

 angular, with a posterior fissure, Haminea-shaped, deeply fissured 

 laterally. Foot oblong, rather widest anteriorly, rounded be- 

 hind. 



Remarks — .Resembles Cylindrobulla Beanii, Fisch. 



Cryptopthalmus cylindricus, Pease. Proceed. Zool. Soc. 

 London, 1861. Plate 7, fig 7. 

 Description. — Testa ? 



Animal elongate, cylindrical, smooth, sides nearly parallel. 

 Cephalic disk short, about one-fourth the entire length of the 

 animal, depressed, subcordate, triangular, convexly truncate in 

 front, posteriorly separated by a fissure into two lobes. Eyes 

 deeply immersed in the cephalic disk, inconspicuous from above, 

 their position being indicated by small pale spots, they can be 

 distinctly seen by turning up the sides of the disk. The lateral 

 lobes closely envelop the body, extending from the head to the 

 excretory tube, the left one overlapping the right ; excretory 

 tube at the posterior end of the body, short, convolute. There 

 is no groove between the lateral lobes and the locomotive disk. 

 Color dusky olive, margins of the cephalic disk paler than cen- 

 trally, and foot paler than above. 



When disturbed the animal contracts itself, assuming a 

 spherical form. Its motions are languid. Station on sea weed, 

 in shallow water.. 



Lophocercus viridis, Pease. — Plate 8, figs. 1 and 2. 



Description. — T. tenui, pellucida, fragilis, alba, subconvoluta, 

 oblique striata, latere sinistro vix inflato ; apertura magna, 

 aperta ; labro ab apicem disjuncto, postice vix producto ; labrum 

 subcallosum. 



Ha b. — H u ah ein e . 



Shell thin, pellucid, fragile, white, slightly convolute, oblique- 

 ly finely striate, left side slightly inflated ; aperture large, open 

 widely; outer lip disjoined from the apex, very slightly produced 

 posteriorly and truncate ; inner lip slightly callous. 



Animal ; body oval or ovate, dorsal region elevated, lateral 

 lobes regular in shape, outline of the edges convex, not meeting ; 

 tentacles well developed, grooved and truncated ; eyes immersed 

 immediately behind the tentacles ; foot linear, adapted for clasp- 

 ing sea weed ; the whole upper surface garnished with more or 



