ZOOLO&T OF FERNANDO NORONHA. 498 



29. HippoNYX GrRATANTTs, var. 



Hipponyx Grayanus, Menke, Carpenter, Proc. Zool. Soc. 1856, p. 4; 

 Crosse, Journ. de Conch. 1862, vol, x. p. 23, 



The distribution of this species appears to be very extensive. 

 Carpenter quotes it from Galapagos, Sandwich Islands, Panama, 

 S.W. Mexico, Mazatlan, and St. Vincent (W. Africa). Some 

 specimens in the British Museum from St. Helena, wrongly 

 named H. rndiatus, Quoy & Graimard, by .Jeffreys *, and two 

 specimens from Fernando ISToronha agree in all respects with this 

 species except in the more excentric position of the apex, which 

 gives them a more capuliform appearance. 



30, Nerita ascensionis, Gmelin. 



In his monograph of Nerita in the Conchylien-Cabinet, Dr. 

 von Martens mentions only the island of Ascension and Gruinea 

 as localities for this species. I had previously noted f the fact of 

 its occurrence at the island of Trinidad off the Brazilian coast, 

 and now I record its presence at Fernando Noronha, where it was 

 also obtained by the ' Challenger ' Expedition. 



.31. Turbo (Calcar) Olfersi, Troschel. 



Trochus Olfersi, Troschel, Philippi, Conch.-Cab. ed. 2, p. 126, pi. 22, 

 f, 1. 



Calcar Olfersi, Fischer in Kiener's Coq. Viv. p. 18, pi. 77 ■ f- 1. 



Trochus iligitatus. Reeve (non Deshayes), Conch. Icon. pi. 5. f, 24; 

 Sowerby, Thes. vol. v. pi. 504, fig. 135. 



Sab. Brazil {Philippi ^ Fischer). 



The localities quoted by Eeeve and Sowerby, namely Central 

 America and Panama, will doubtless prove incorrect. 



Failing to recognize this species as T. Olfersi, Sowerby has 

 placed that name among the synonymy of T. imhricatus, which, 

 however, is a perfectly distinct shell, T. cUgitatus of Deshayes, 

 as pointed out by Philippi, Fischer, and Carpenter, is identical 

 with the common T. unguis, Wood, of the Californian coast. 



32. Trochus (Eutrochus) jujubinus, Gmelin. 



Sab. "West Indies {Philippi Sf Fischer). 



The two specimens from Fernando Noronha are more widely 



* Ann, & Mag. Nat, Hist. 1872, vol. ix. p, 264. 

 t md. 1881,Tol. viii. p. 431. 



