220 LAND AND FRESH- WATER SHELLS OF N. 



Fig. 373. numerous separate plates, con- 



vergiug towards and creuulatiug 

 the cutting margin. 



Lingual dentition (of 31. sig- 

 natus*) : Teeth arranged en chev- 

 ron. Central plate narrow with 

 one small obtuse denticle, laterals 

 with one prominent tooth sup- 



'■ Lingual dentition 



porting two denticles and a small of juacroceramus 



siffnatus. 



Jaw of Macrocera- OnC at baSG. [Blaxd.] 



mus signatus. 

 [Bland.] 



Subgenus MACROCERAMUS, Guild, s. str. 



Shell striate or costulate, conical, often turreted, white, varie- 

 gated with brownish; apex whole; whirls 9-12; aperture 

 rounded-quadrangular, not effuse. 



Animal (of M. kieneri) whitish, translucent, a little darker 

 above the head ; body very short, terminating in a blunt ex- 

 tremity ; eye-peduncles of moderate length, of nearly equal 

 diameter throughout, terminating in a rounded bulb ; tentacles 

 very short, nearly rudimentary ; ocular points large and black. 



Fig. 375. 



Macroceramus kieneri, Pfeiffer. — Shell fusiform, attenuated- 

 cylindrical, whitisji, or grayish clouded and marbled with brown ; spire 

 acuminate ; whirls from nine to thirteen, rounded, 

 with numerous oblique, prominent striae or ribs; 

 suture impressed, creiiulated by the extension of the 

 alternate ribs across it ; aperture rounded, oblique ; 

 peristome thin, somewhat reflected ; axis impressed, 

 not truly perforate ; on the last whirl a colored line 

 revolves : this is sometimes raised a little from the 

 surface, and sometimes is sharp like a delicate 

 carina. Length 18, diam. of antepenultimate whirl 

 6 ; of aperture, length 4^, breadth 4^ mill. 



Pupattnicarinata, BiNNEY,Terr. Moll. I, not Lamarck. 



Bulbnus kieneri, Pfeiffer, Proc. Zool. Soc. 1846, 40; Mon. Hel. Viv. II, 



79 ; in Chemnitz, ed. 2, 131, pi, xlii, f. 23, 24.— Reeve, Con, Icon. 463. 



Macfoceramiis kieneri. 



Bland, Ann. N. Y. Lye. VIII, 162, f, 5, 6 (1865). 



