MOLLUSCS.. 67 



the oblique pale brown stripes on the narrowest extremity of tho 

 body-whorl, the longitudinal more or less nodulous costse subobsoleto 

 on the last whorl, and the transverse striation and line. Tho 

 Dumber of whorls seems to vary very considerably in the ten speci- 

 mens under examination, and the apex of the spire appears to be 

 invariably broken off. When this has occurred the animal closes 

 the top with a smooth, shelly, spiral callosity, and it becomes 

 a matter of uncertainty how many whorls may have been lost. 

 This will account for the great difference in the number oi remaining 

 volutions in the following specimens: — IS T o. 1 (the type of G. pyg- 

 mcea from the collection of tho late Henry Adams) has six and a 

 half normal whorls left; Nos. 2, 3, and 4 have seven each, 5 and 6 

 havo eight each, No. 7 has nine, No. 8 ten, No. 9 eleven, and 

 No. 10 has twelve. The number of whorls represented in tho 

 figures of C. macrostoma are not reliable, as fig. 12 represents 

 seventeen, whilst fig. 11 (evidently taken from the same specimen) 

 exhibits but fifteen. The costto are also somewhat variable in 

 number and prominence, but invariably become more or less obsolete 

 on the contracted body-whorl, where, being crossed by the spiral 

 sulci, they present the granular aspect described by A. Adams in his 

 diagnosis of C. costata. The outer lip, which is very liable to be 

 broken away, is expanded, thickened but not varixed, grooved ex- 

 ternally and spotted with red lines, which for the most part fall in 

 the grooves referred to. Within it is smooth, and in full-grown 

 specimens exhibits a slight tubercular prominence, above which a 

 small sinus is observable, close to the suture. 



70. Cerithium (Khinoclavis) fasciatum. 



Cerithium fasciatum, Brwj., Kiener, Coq. Viv. pi. 20. figs. 1-1 c; 

 Sowerby, Conch. Icon., Vertagus, figs. 9 a, 9 b. 



Hob. Friday Island, Torres Straits. 



The young specimen from this locality is very like Sowerby's 

 figure 9 b, but the lower part of the last whorl is white entirely. 



71. Cerithium (Khinoclavis) vertagus. 



Cerithium vertagus, Linn., Kiener, Coq. Viv. pi. 18. fig. 2. 

 Vertagus vulgaris, Schumacher, Essai Nouv. Syst. p. 223; Adams, 

 Genera, i. p. 285, pi. 30. figs. 1-1 e. 



Hob. Port Mollo, Queensland, and Friday Island, Torres Straits, 

 on the beach. 



72. Cerithium (Khinoclavis) kochi. 



Cerithium kochi, Philippi, Abbild. iii. pi. 1. fig. 3 ; Sowerby, Thes. 

 Conch, vol. ii. pi. 176. figs. 13-15 ; id. in Reeve's Conch. Icon., Ver- 

 tagus, figs. 26 a, b. 



Bab. Red Sea (Mac-Andrew) ; East Africa (Philippi) ; Mauritius 

 {Mbbius) ; Amirantes Islands, at Poivre Island in 20 fms., and lie 



p2 



