MAZATLAN UNIVALVES BIAS 
Genus TORNATINA, 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. TORNATINA INFREQUENS, C. B. Ad. 
Bulla (Tornatina) infrequens, C. B. Ad. Pan. Shells, p. 214, 
no. 319; do. p. 319. 
?=Bulla (Tornatina) gracilis, Mke. (non A. Ad.) Zeit. f. Mal. 
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. B. Ad. 
from Panama. T. infrequens is distinguished by the Oliva- 
hike 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, 
Hab.—Panama; extremely rare; C. B. Adams.—Mazatlan ; 
very rare, on Spondylus ealcifer ; L’pool Col. 
Tablet 783 contains the finest specimen; and the smallest 
measuring, ‘07 in length. 
223. TORNATINA CARINATA, 2. 8. 
T. t. eylindraced, albd, levi, infra suturam appressam acute 
carinata ; inter suturam et carinam excavatd ; anfr. v. quarum 
duo primi discoidales, ad spiram verticaliter affixi ; spird plus 
minusve extante; aperturd pralonga, labro acuto, in medio 
producto, postice ad suturam vix canaliculato; labro tenw ; 
pariete ad basin tumida ; columella plica infra parietem robusta 
spiraliter munita. 
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, asin T. infrequens. By some of the above char- 
acters it is further distinguished from T. cerealis, Gd. (Mea. & 
