78 TROCHUS. 



Trochus (Monodonta) atropurpureus GLD., Proc. Host. Soc. Xat. 

 Hut iii, p. 107 (1849). U. S. Expl Exped. Shells, p. 189, t. 13, f. 

 224. Trochus samoensis HOMBRON ET JACQUINOT, Voy. au Pole 

 Sud. etc., Zool., v. p. 58, 1. 14, f. 21-25 (1854). FISCHER, Coq. Viv., 

 p. 239, 1. 82, f. 2. 



A solid little species, evidently allied to the group of T. cru- 

 ciatus ( l< Clanculopsis "). Numerous specimens before me show little 

 variation. The more notable characters are the uniform dark color 

 with rosy apex, the very regular and superficial cutting of the lirse 

 into beads on every part of the surface, and the teeth around the 

 umbilicus. 



T. BATHYRHAPHE E. A. Smith. PI. 11, figs. 34, 35. 



Shell depressed-conic, the base flattened, olive-green, the apex 

 green, ornamented with deep brown granules, rather widely umbil- 

 icate; whorls 5i, convex, separated by a narrowly canaliculate suture, 

 encircled by granose Iira3, about 7 on penultimate whorl ; last whorl 

 with roundly angulated periphery, encircled by about 14 granulose 

 lira?, umbilicus white, surrounded by a white granuliferous rib, and 

 with a smooth rib within; aperture oblique, beautifully pearly, 

 lirate within, lip with the outer margin crenulated, at the base 

 strongly lirate ; columella inserted on the whorl above, oblique, 

 dentate below. Alt. 6$, diam. 8-] mill. (Smith.') 



San Christoval, Solomon Is. 



Trochus ( Clanculus) bathyrhaphe SMITH, Journ. Linn. Soc. London, 

 xii, p. 557, t. 30, f. 17 (1876). 



Distinguished from atropurpureus by the difference of color, 

 more rounded spire, and the peculiarity of the umbilicus. The main 

 color of bathyrhaphe is a very dark olive-green, the apex being 

 bright green ; the granules of the infrasutural series, which are con- 

 siderable larger than the rest, are dark brown at intervals, two 

 or three together being of this color, and those between them of the 

 same hue as the shell. The granules on the base are subalternately 

 reddish-brown and greenish. (Smith.') 



T. MICRODON A. Adams. PI. 13, figs. 91, 92. 



Shell depressed conoidal, thick, solid, of a reddish-brown hue, 

 interstices between the ribs, chocolate colored, above marked with a 

 few broad yellowish or flesh-tinted maculations radiating from the 

 sutures toward, but not quite reaching the periphery, which with the 

 base, has the ribs sparcely dotted with white ; spire low-conic, apex 



