52 THE VOYAGE OF H.M.S. CHALLENGER. 



Habitat. — Port Jackson (Angas). 



This species is generally assigned to the sub-genus Clanculus, and there accordingly I leave it, 

 but it is conical in form instead of being conoidal, and angulated at the base instead of being 

 rounded. 



5. Trochus (Clanculus) floridus, Pkilippi. 



Trochus floridus, Philippi, Conch. Cab. (ed. Kiister), 1846, p. 243, sp. 309, pL xxxvi. fig. 15. 



„ ,, Philippi, Zeitschr. f. Malacologie, 1849, p. 156. 



Clanculus gibbosus, A. Adams, Proc. ZooL Soc. Lond., 1851, p. 162, sp. 45. 



„ „ Angas, South Austr. Moll., Proc. Zool. Soc. Lond., 1865, p. 178, No. 143. 



Trochus floridus, Fischer in Kiener's Iconog., p. 237, sp. 125, pi. lxxxL fig. 3. 



April 17-18, 1874. Port Jackson, Sydney. 2 to 10 fathoms. 



Habitat. — South Australia, Port Jackson (Angas), New Ireland (Adams). 



This is a species excessively like Trochus (Clanculus) clanculus, Wood, but that species is higher 

 and more conical, with less convex whorls, and the suture not depressed as here. The colour, sculp- 

 ture, and mouth, too, are all slightly different. One would be very apt to overlook these differences, 

 but when once noticed they are striking. 



6. Trochus (Euchelus) atratus (Gmelin). 



Chemnitz, Conch. Cab., vol. v. p. 172, pL clxxvii. figs. 1754-55. 

 Turbo atratus, Gmelin, Syst. Nat., 13th ed., p. 3601, sp. 53. 



„ ,, Dillwyn, Cat., vol. ii. p. 845, sp. 71. 



Monodonta canaliculata, Lamarck, Anim. s. vert., vol. vii. p. 37, and (ed. Desh.) vol. ix. p. 181, sp. 20. 



,, „ Delessert, Recueil, pi. xxxvii. fig. 1. 



Trochus canaliculatus, Quoy and Gaimard, "Astrolabe," vol. iii. p. 261, pi. lxiv. figs. 21-25. 



,, atratus, Philippi, Conch. Cab. (ed. Kiister), p. 174, pi. xxvii. fig. 14. 

 Monodonta atrata, A. Adams, Monog. Trochid., Proc. Zool. Soc. Lond., 1851, p. 174, sp. 6. 

 Turbo atratus (Trochus), Wood, Ind. Test. (ed. Hanley), p. 154, pi. xxxi. fig. 72. 

 Euchelus denigratus, Adams, Genera, voL i. p. 418, pL xlvi. fig. 6. 



,, canaliculatus, Chenu, Man. Conch., vol. i. p. 358, fig. 2656. 

 Trochus atratus, Fischer in Kiener's Iconog., p. 293, sp. 166, pi. xciv. fig. 3. 

 „ (Euchelus) atratus, E. A. Smith, "Alert" Collections, p. 74, No. 97. 



September8, 1874. Flinder's Passage, Cape York, North-Eastern Australia. 7 fathoms. 

 September 8, 1874. Off Albany Islaud, Cape York. 3 to 12 fathoms. 

 Station 208. January 17, 1875. Lat. 11° 37' N, Ion. 123° 31' E. Philippines. 

 18 fathoms. Blue mud. 



Habitat. — Nicobar Islands (Chemnitz), Vanikoro and Tongatabu (Quoy and Gaimard), 

 Fiji, Moluccas, Sorong (Fischer), Ticao (Adams), North-Eastern Australia (British Museum). 



