TIIK NAUTILUS. 115 



the ends of tlie outer lip, wliicli is fleshy yellowisli on the face. 

 Siiulpture of irrt'giihir {^rowtli-lines juid weak, microscopic spiral 

 striation, scarcely visible except umler tlie compouiul niicioscope. 

 At each end there are about seven spiral grooves, which are widely 

 separated except close to the ends. The outer li|) is veiy convex on 

 the face, somewhat thickened outside, incurved and armed with 

 about 28 unequal, not very strong teeth. The grooves between the 

 teeth extend as far as the middle of the face of the lip. The colu- 

 mella bears a strong white fold, terminating outwardly in a vertical 

 callus on the ventral side of the base of the siiell. There is scarcely 

 any anterior notch. Posteriorly tlie callus of the peristome extend3 

 downward from the apex and towards the aperture. Deep within 

 the aperture there is a longitudinal callous ridge on the parietal wall 

 of the aperture. Length lo.;"), diam. 9 mm. 



Fakara, Awaji, Japan, Y. Ilirase. 



Tills belongs to a rather numerous group of species, among which 

 it is nearest to 0. bulla Adams and Reeve (Zool. S.nmarang p. 21, 

 pi. G, fig. /)). The new form is less narrow anteriorly and differ- 

 ently colored. It is blunter at the ends than 0. punctata. 



A NEW LYMNAEA FROM MONTANA. 



DY FRANK C. BAKER. 



Galra MONTANENSIS, n. sp. 



Siiell of medium size, rather thin, translucent, ovate-turrefed ; 

 periostracum light horn color; surface shining, lines of growth 

 distinct, crossed by very fine wavy spiral lines; whorls six. convex, 

 the body whorl somewhat obese; sutures deeply impressed; spire 

 acute, longer than the aperture ; aperture ovate, outer lip thin ; inner 

 lip wide, somewhat triangular, reflexed over the umbilical region ; 

 there is no distinct axial plait, hut the inner lip is slightly indented 

 where it touches the parietal wall ; the umbilical chiidc is narrowly 

 open. There are two rest period marks on one adult specimen. 



Length 14.00; width G.50 ; aperture length, G.80 ; width 4.00 

 mill, adult. 



Length y.OO ; width .5.00 ; aperture length, .O.-'jO ; width 3.00 mill. 

 juv. 



