44 TROCHUS. 



Gray, in Diefferibach, Travels in New Zeal., p. 239. — T. aclnosus 

 Gould, U. S. Expl. Expecl, f. 217 (pi. 3, figs. 16, \1).—T. fidvolahris 

 HoMBR. ET Jacq,., Voy. ail Pole Sad. pi. xiv, f. 14-16. — Polydonta 

 tritoiiis A. Ad., P. Z. S. 1855, p. 132. 



The synonyir.y of this species was worked out by Dr. Fischer. 

 There is but little variation in the several suites I have examined. 

 The more prominent characters are the regular beads, the secondary 

 sculpture of fine stria?, the striate base, and especially the brown; 

 parietal callus. 



The animal is yellowish brown, foot reddish or purplish brown 

 filaments white, three on each side. The head lobes are smooth and 

 rounded, and joined together across the head ; the eyes are on rather 

 long white peduncles. 



Section Pr/ECIa Gray, 1857. 



Piwcla Gray, Guide Syst. dlst. moll. Brit. 3Ius., p. 148. 

 T. eleoantulus Wood. PI. 14, figs. 16, 17. 



Shell perforate, conical, white, maculated with red or brown, 

 yellowish beneath; whorls 9, the first 7 exactly conical, planulate, 

 ornamented with 4 or 5 spiral series of small granules, the lower 

 margin nodulous, and with a double row of granules ; penultimate 

 whorl convex, nodose below, the nodules heavy ; suture profound ; 

 last whorl convex, ornamented with about 15 or 16 oblong nodules 

 around the periphery, plano-convex beneath, with 7 to 9 concentric 

 lirpe ; umbilical area broad, yellowish, with a spiral ridge; aperture 

 subrhombic, canaliculate within, the basal margin plicate ; col- 

 umella tortuous, denticulate below and within. 



Alt. 25, diam. 23 mill. (Fischer.) 



Ceylon ( Wood.) 



T. elegantulus Wood, Ind. Test, suppl., t. 5, f. 9. — Reeve, 

 Conch. Icon. f. 96. — Fischer, Coq. Viv., p. 194, t. 63, f 1. — T. hys- 

 ginus Valenciennes, Voy. de la Venus, Moll., t. 4, f 3. 



A shell of remarkable form ; the first 7 whorls are flat and form an 

 exactly conical spire ; the two last whorls are convex, globose, and 

 bear a series of nodules on the lower part. (Fischer.) 



Section Belangeria Fischer, 1880. 



Belangerla Fischer, Coquilles Vivantes, p. 415. 

 T. scABRosus Philippi, PL 12, figs. 78-81. 



Shell fivlse-umbilicate, conic, thick, solid ; outlines of spire nearly 

 straight ; whorls 6 to 7, i)lanulate, the last often constricted, carinate 



