CYLINDRELLA. 309 



2. CYLINDRELLA LACTARIA, Gould. 

 Plate LXIX. Figure 2. 



C. testa fusiformi, ad apicertj. truncata, tenui, albida, sur- 

 sum fuscescente, rivulis lacteis undique longitudinaliter 

 notata ; anfractibus (superstitibus) ad decern, convexius- 

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

 ampla, expansa ; peristomate albo, modice everso ; collo 

 brevi. 



SYNONYMS AND EEFEBENCES. 



Pupa (Siphonostoma)fo(;terto, Gould, Bost. Journ. Nat. Hist. IV. 491, pi. 

 24, fig. 13. 



BESCRIPTION. 



Animal wHte, ivith 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 Unes. 

 Permanent whorls about ten, the entire number about 

 twenty-five, elegantly sculptured with deUcate, oblique, 

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

 the last whorl has a distinct keel skirting the region of 

 the umbilicus ; pi-otrusion 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. 



VOL. II. 78 



