CYLINDilELLA. 



2. CYLINDRELLA LACTARIA, GOULD. 

 PLATE LXIX. FIGURE 2. 



C. testa fusiform!, ad apicem truncata, tenui, albida, sur- 

 sum fuscescente, rivulis lacteis undique longitudinaliter 

 notata ; anfractibus (superstitibus) ad decem, convexius- 

 culis, concinne striatis, ultimo carinato ; apertura circular!, 

 ampla, expansa ; peristomate albo, modice everso ; collo 

 brevi. 



SYNONYMS AND REFERENCES. 



Pupa (Siphonostoraa) lactaria, GOULD, Bost. Journ. Nat. Hist. IV. 491, pi. 

 24, fig. 13. 



DESCRIPTION. 



ANIMAL white, with a dark line along the back of each 

 tentacle, one along the median line, and a very delicate 

 one along each cheek ; ocular points large and black. 



SHELL fusiform, truncated at tip, thin and translucent, 

 yellowish white, becoming dusky towards the apex, and 

 ornamented with longitudinal, flexuous, milk-white lines. 

 Permanent whorls about ten, the entire number about 

 twenty-five, elegantly sculptured Avith delicate, oblique, 

 longitudinal striaj, of a uniform size on all the whorls ; 

 the last whorl has a distinct keel skirting the region of 



o o 



the umbilicus ; protrusion from the preceding whorl short, 

 forming a large, rounded, trumpet-shaped aperture, ex- 

 panding into a narrow, white lip. Aperture at an angle 

 of forty-five degrees with the axis of the shell. 



Length three-fifths of an inch ; breadth three-twentieths 

 of an inch. 



