Report on the zoological collections made in the Indo-Pacific Ocean ...

MOLLTTSCA. 67the oblique pale brown stripes on the narrowest extremity of thebody-whorl, the longitudinal more or less nodulous costoe subobsoleteon the last whorl, and the transverse striation and lira). Thenumber of whorls seems to vary very considerably in the ten specimensunder examination, and the apex of the spire appears to beinvariably broken off. When this has occurred the animal closesthe top with a smooth, shelly, spiral callosity, and it becomesa matter of uncertainty how many whorls may have been lost.This will account for the great difference in the number oi remamingvolutions in the following specimens :—No. 1 (the type of C. pygnuvafrom the collection of the late Henrj^ Adams) has six and ahalf normal whorls left ; Nos. 2, 3, and 4 have seven each, 5 and 6have eight each, No. 7 has nine. No. 8 ten, No. 9 eleven, andNo. lU has twelve. The number of whorls represented in thefigures of C. macrostoma are not reliable, as fig. 12 representsseventeen, whilst fig. 11 (evidently taken from the same specimen)exhibits but fifteen. The costa) are also somewhat vai'iable innumber and prominence, but invariably become more or less obsoleteon the contracted body-whorl, where, being crossed by the spiralsulci, they present the granular aspect described by A. Adams in hisdiagnosis of G. costata. The outer lip, which is very liable to bebroken away, is expanded, thickened but not varixed, grooved externallyand spotted with red lines, which for the most part fall inthe grooves referred to. Within it is smooth, and in full-grownspecimens exhibits a slight tubercular prominence, above which asmall sinus is observable, close to the suture.70. Cerithium (Rhinoclavis) fasciatura.Cerithimn ftisciatiira, Brug., Kiener, Coq. Viv. pi. 20. figs. 1-1 c;Suwerby, Conch. Icon., Vertagus, figs. 9 a, 9 h.Ilah. Friday Island, Torres Straits.The young specimen from this locality is very like Sowerby'afigure 9 h, but the lower part of the last whorl is white entirely.71. Cerithium (Rhinoclavis) vertagus.Cerithium vertagus, Linn., Kiencr, Coq. Viv. pi. 18. fig. 2.Vertagus vulgaris, Schumacher, Essai Nouv. Syst. p. 228; Adams,Genera, i. p. 285, pi. 30. figs. 1-1 c.Hah. Port Molle, Queensland, and Friday Island, Torres Straits,on the beach.72. Cerithium (Khinoclavis) koclii.Cerithium kocbi, Philippi, Ahhild. iii. pi. 1. fig. 3; Sowerhy, Thes.Cmich. vol. ii. pi. 176. figs. 13-15 ; id. ifi Reeve's Conch. Icon., Vertagus,figs. 26 a, h.Ilah. Red Sea (MacAndrew) ; East Africa (Philijipi) ; Mauritiusi^Mobius) ;Amirantes Islands, at Poivre Island in 20 fms., and He