212 Panama Shells. CYCLOSTOMID.E. 



315. Auricula trilineata. Nov. sp. 



Shell obovate : dark brownish red, with three revolving dis- 

 tant white lines on the last whorl, of which the anterior line is 

 not so well denned : rufous on the columella : with irregular 

 striae of growth : apex obtuse ? spire very small, with the out- 

 lines curvilinear : whorls ,* very narrow, imbricately 



appressed, with the suture distinct : last whorl very large, con- 

 volate : aperture very long, narrow : labrum not sharp, with a 

 deposit over the whole visible interior, which is transversely 

 plaited : at the end of the columella with a twisted plait, sepa- 

 rated by a sinus from a large transverse plait, above which are 

 four small approximate transverse plaits. 



Mean divergence about 135 ; length .71 inch ; breadth .43 

 inch ; length of spire .05 inch. 



Station. Unknown. 



Habitat. Panama ; C. B. A. ! 

 Only 1 specimen was found. 



sic. Auricula - -. Sp. indet. 

 Station. Under stones at high water mark. 



Habitat Panama ; C. B. A. ! 



We obtained 2 specimens, which, although immature, appear 

 distinct from the other species of Auricula. 



Family CYCLOSTOMID^E. 



TRUIVCATEr,liA. We include this genus, as well as 

 Pedipes and Auricula, in this paper, because they are maritime 

 in their habits. Their geographical distribution, corresponding 

 with that of the marine genera, is entirely different from that of 

 the terrestrial molluscs. 



* In our unique specimen the suture of the iipper whorls is obliterated by ero- 

 sion. Probably the number of whorls is six or seven. 



