MAZATLAN UNIVALVES 171 



GENUS TOBNATINA, A. Adams. 



Distinguished from Cylichna, 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, Mke. (non A. Ad.} Zeit.f. Mai. 



1850, p. 162, no. 3. 



Menke's species being white, not horn-coloured like T. gra- 

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

 specimen wedged in the mouth of a dead Conus puncticulatus, 

 is almost certainly the same as that described by C. IB. 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. '03. 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. TOENATINA CAEINATA, n. s. 



T. t. cylindraced, alba, lavi, infra suturam appressam acute 

 carinatd ; inter suturam et carinam excavatd ; anfr. v. guarum 

 duo primi discoidales, ad spiram verticaliter affixi ; spird plus 

 minusve extante ; aperturd prcelongd, 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 swelling 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, G-ld. (Mex. fy 



