MAZATLAN UNIVALVES 171 



Genus TOENATINA, A. Adams. 



Distinguished from Cyliclina, Loven, by the head being de- 

 veloped behind into tentacular lobes. Shell with the spire 

 distinct. Columella with a spiral plait, 



222. TOENATINA INFEEQUENS, C B. Ad. 



Bulla (Tornatina) infrequens, C. B. Ad. Pan. Shells, p. 214, 



no. 319 ; do. p. 319. 

 P = Bulla (Tornatina) gracilis, Mice, (non A. Ad.) Zeit.f. Mai. 



1850, p. 162, no. 3. 



Menke's species being white, not hom-colom'ed like T. gra- 

 cilis from the China Seas, and being identified from a single 

 specimen wedged in the mouth of a dead Conns puncticulatus, 

 is almost certainly the same as that described by C. B. Ad. 

 from Panama. T. infrequens is distinguished by the Oliva- 

 like spire, more or less elevated and deeply channeled along 

 the suture. The body whirl is not swollen anteriorly, and the 

 fold lies slanting on its base. Long. '14:, long. spir.'O'S. lat. '05, 



Sab. — Panama ; extremely rare ; C. B. Adams. — Mazatlan ; 

 very rare,, on Spondylus calcifer ; L'pool Col. 



Tablet 783 contains the finest specimen ; and the smallest 

 measuring, '07 in length. 



223. Tornatina caeinata, n. s. 



T. t. cylindraeea, alba, IcBvi, infra suturam appressam acute 

 carinatd ; inter suturam et carinam excavata ; anfr. v. quarum 

 duo primi discoidales, ad spiram verticaliter affixi ; spira plus 

 minusve extante ; aperturd prcelonga, labro acuto, in medio 

 producto, postice ad suturam vix canaliculato ; labro tenui ; 

 pariete ad basin tumidd ; columelld plied infra parietem robustd 

 spiraliter munitd. 



Known from T. infrequens (1) by the smaller size, and more 

 irregular spire ; (2) by the suture, which is not channeled ; 

 (3) by the shoulder, which is sharply carinated, with the space 

 hollowed between the keel and suture ; (4) by the sweUing of 

 the body whirl at the base ; and (5) by the plait which runs 

 more transversely, below the body whirl, instead of obliquely, 

 almost on it, as in T. infrequens. By some of the above char- 

 acters it is further distinguished from T. cerealis, Gld. (Mex. Sf 



