OF CONCHOLOGY. tO 



less numerous, cirrigerous appendages. Tail long, compressed 

 and lance-pointed. Color grass green, mottled with darker, 

 sometimes dotted minutely with brown, or a few blue spots mar- 

 gined with black along the edge of the lateral lobes and on the 

 neck. 



Station on sea weed, in shallow water. When handled it dis- 

 charges a white viscid fluid. 



Genus LOBIGER, Krohn. 



Five species of this genus have been described, viz. : 



L. pellucidus, A. Ad. Sab. ? 



L. Cumingii, A. Ad. " Columbia. 



L. Philippu, Krohn. " Sicily. 



L. Souverbn, Fischer. " Guadeloupe. 



L. picta, Pease. " Huaheine. 



Remarks. — The two first were described from the shell only, 

 consequently we consider their generic position as doubtful. The 

 animals of the remaining three differ so widely, in the number 

 and character of their lobes and tentacles, as to render it ne- 

 cessary to modify the diagnosis of the genus as given by 

 Krohn and Adams. 



L. Philippii, Krohn, on which the genus was founded, is pro- 

 vided with two pairs of simple fleshy lobes and one pair of ten- 

 tacles. L. Souverbii, Fischer, has but a single pair of lobes, 

 similar to those of the above. L. picta, Pease, has two pairs of 

 compound, thin, pellucid lobes and two pairs of tentacles. We 

 would therefore define the genus as follows : 



" Body elongate, produced posteriorly into a long, pointed 

 tail; provided with one or two pairs of natatory appendages on 

 the sides of the body, in the form of simple or compound lobes, 

 dilated in pyriform shapes. One or two pairs of auriform ten- 

 tacles. Eyes sessile on each side of the head. Posterior portion 

 of the body and under surface of the lobes more or less papil- 

 lose/' 



We would remark that species of genera of widely aberrant 

 form, such as the above and Volvatella, differ widely in their 

 specific characters. No two species of the above genera agree 

 with each other, but present differences, greater even than those 

 on which many genera. have been founded. 



Lobiger picta, Pease. — Plate 8, fig 3. 



Description. — T. ovata, tenuiscula, longitudinaliter striata, 

 alba, epidermide flavescente induta ; latere sinistro vix dilatato ; 

 apertura oblongo-ovalis, antice rotundata, postice producta, con- 



