THE NAUTILUS. 115 



the ends of (lie outer lip, which is fleshy yellowish on fhe face. 

 Sculpture of irregular growth-lines and weak, microscopic spiral 

 Btriation, scarcely visible except under the compound microscope. 

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

 separated except close to the ends. The outer lip is very 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 shell. There is scarcely 

 any anterior notch. Posteriorly the callus of the peristome extends 

 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 13. ~>, diam. mm. 



Fakara, Awaji, Japan, Y. Ilirase. 



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

 it is nearest to 0. biil/u Adams and Reeve (Zool. Samarang p. 21, 

 pi. G, fig. 5). 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. 



BY FRANK C. BAKER. 



GALBA MONTANENSIS, n. sp. 



Shell of medium size, rather thin, translucent, ovate- turreted ; 

 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, ouler 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 chink is narrowly 

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



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

 mill, adult. 



Length U.OO ; width 5.00 ; aperture length, 5.50 ; width 3.00 mill, 

 juv. 



