HIM A. 4H 



N. NUCLEOLI'S, Phil. PI. lo, fio-. 262. 



Whitish, brown at suture and base, with usually a })rown 



central band. Length, 5-6-5 mill. 



Mazatlan ; Acapulco -W. M. Gabb. 



This is one of the few Mazatlan species unknown to Carpen- 

 ter ; it is a verv distinct and i)retty form. 



N. iNCRASSATA, Strom. PI. 15, figs. 268-266. 



Brownish white, usually obscurely maculate or banded with 

 brown ; whorls with or without a slight shoulder ; shell broad 

 to elongated ovate ; occasionally (in some specimens) Avith a 

 varix crossing the whorl ; lip varix strong, usually with three 

 brown spots. Length, 'iS-MJ inch. 



Iceland, and North Europe to Azores, Mediterranean. 



Fossil, widely distributed in European tertiary and quaternary 

 deposits. .Owing to the great variability of this species, it has 

 received numerous names : one of these forms, indeed, is usually 

 separated by some of the best European conchologists, and it 

 will be as well, perhaps, to designate it as var. jji/grm^o, although 

 the immense series of specimens before me compels me to agree 

 with Dr. von Martens, that it has no real claim to specific dis- 

 tinctness. 



Var. PYG-M.-EA, Lam. Fig. 265. 



Shell narrower and more finely sculptured ; whorls rounded, 

 not angulated aboA-e ; spire proportionately longer. 



N. incrassa/a is a ver}^ active mollusk, and now and then 

 (ihanges its crawling position by leisurely' floating with its foot 

 upwards. It often gets into lobster and whelk pots. The spawn 

 cases are solitary, ^'ellowish, and shaped like a round flask, with 

 a small neck or opening at the top. 



X. ROSACEA, Reeve. PI. 15, fig. 26T. 



Deep rose-color, black edged at the base, lip white. 



Length, 8*5 mill. 



• Habitat ti/iknown. 



May be a variety of N. incransata. 



N. PROMPTA, Marrat. 



Ovately conical, highly polished, pale j^ellowish white, with 

 two reddish-purple dotted bands, one in the eenti'e of the body- 



