MONILEA-PRIOTROCHUS. 257 



M. XUCLEA Philippi. PL 61, figs. 31, 32. 



Shell narrowly umbilicate, globose-conoidal, solid, whitish, mac- 

 ulated with chestnut, sometimes banded, often punctate and artic- 

 ulated with white dots ; spire conic, acute, short; sutures impressed ; 

 whorls 5 to 6, convex, decussated by spiral lirse and close, strong 

 longitudinal stria? ; the lirse usually with intermediate lirulse ; whorls 

 often a little flattened below the suture, with a slight angle at the 

 shoulder ; last whorl globose and convex ; aperture slightly oblique ; 

 outer and basal lips closely lirate within ; columella short, concave, 

 its edge plicate-denticulate, terminating below in a tooth ; umbilicus 

 funnel-shaped, white, margined by a slight eonvexity terminating 

 below the columellar tooth. 



Alt. 7* diam. 8-j mill.; alt. 9, diam. 9 mill. 



New Caledonian Archipelago ; Japan; Viti Is. (Garrett.) 



T. nucleus PHIL. Zeitschr. f. Mai. 1849, p. 17 i ; Conchyl. Cab., p. 

 306, t. 44, f. 9. FISCHER, Coq. Viv., p. 256, t. 86, f. 2. 



A peculiar little species, of globose form, with truncated columella, 

 lirate interior, and finely decussated surface. The color pattern is 

 very variable. The Viti Id. specimens before me have rather large, 

 angular radiating maculations above, of a blackish umber shade, 

 a lighter girdle around the periphery, the base maculated and tes- 

 sellated umber and buff. 



Subgenus PRIOTROCHUS Fischer, 1880. 



Aphanotrochus v. MART., in Mobius' Reise nach Mauritius, 

 Mollusken, p. 296 (1880) type, Tr. obscurus Wood. Priotrochus 

 FISCHER, Coq. Viv., p. 420 (1880) ; Manuel de Conchyl., p. 824. 



Von Martens declares Fischer's name, Priotrochus to have one 

 month priority. 



The relations of the group are with Monilea and Solanderia. 

 The operculum and animal are unknown. 



M. OBSCURUS Wood. PL 61, figs. 33. 



Shell narrowly perforated, conical, elevated, very solid, thick, 

 ashen-white, with longitudinal chestnut streaks or maculations, 

 spire elevated, apex acute, sutures slightly impressed, the whorl 

 below them closely appressed ; whorls 6 to 7, the upper ones sub- 

 angular and nodulose in the middle, the last with a coronal series 

 of knobs, on large specimens becoming obsolete toward the aper- 

 ture ; entire surface traversed by spiral lirulse, much narrower than 

 17 



