ARTICLE XX. 



Description of a New Species of Helix, from California, and a new Characteristic Form of 

 certain American Colimacex. By Isaac Lea. Read March bth, 1852. 



Helix Lecontii. PI. XXX. Fig. 13. 



Testa plano-convexd, inferne convexd, papillosd, bruneo-corned, late umbilicald, tridentatd, intus columnd 

 accessione instructd; anfractibus senis; aperlurd subrotundatu, constrict A; labro hipatico, reflexo, bidentato ; 

 columella uno-dentatd. 



Shell plano-convex, convex below, papillose, brownish horn-colour, widely uinbilicated, three toothed, furnished 

 with an accessory column within; whorls six; aperture rounded, constricted; outer lip dull-brown, reflexed, two- 

 toothed ; columella one-toothed. 



I lab. St. Francisco, J. L. Le Conte, M. D. 



My cabinet and cabinet of Dr. Le Conte. 

 Diam. .27, Length .15, of an inch. 



Remarks. — This is a very beautiful little species, which is allied in some of its charac- 

 ters to hirsula, Say, infccla, Say, and Leai, Ward. It is about the size, outline and 

 colour of the last, and the umbilicus is of the same size. It differs, however, in the teeth, 

 the Leai having none on the outer lip; and in the papillae, which arc smaller, rounder and 

 closer in the Leai. The tooth on the columella is alike in both, being long, white, and 

 incurved. Like the inflecla, it has two teeth on the outer lip, but these are much larger 

 and whiter in the inflecta, which differs also in having the umbilicus closed, and in the 

 papillae being less distinct. In colour it is like a brown hirsuta, but it differs in being 

 smaller, in being umbilicatc, and in having two teeth on the outer lip, instead of a sinus, 

 as in hirsuta, which has a much larger tooth on the columella, and a much more con- 

 stricted aperture. 



Fig. 13, b represents the papilla? enlarged. 



Neither of the few specimens brought by Dr. Le Conte has the animal alive, which, of 

 course, will remain yet to be described. The papilla? cover the whole surface. On the 

 upper portion of the whorls they are close and elongate, passing into the form of stria). 

 On the lower portion they are more rounded and beautifully displayed. It is very proba- 

 ble that in some very perfect specimens, they may be found to have a hirsute character. 



I dedicate this species to Dr. Le Conte, whose enterprising researches in California 

 have brought to our knowledge many new forms in other branches of natural history. 



