REPORT ON THE GASTEROPODA. 67 



25. Trochus (Trochocochlea) fuligineus, A. Adams (PI. IV. fig. 11). 



Labio fuliginea, A. Adams, Monog. Trochid., Proc. Zool. Soc. Lond., 1851, p. 180, sp. 25. 

 Trochocochlea fuliginea, Adams, Genera, vol. i. p. 426. 



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



Habitat.— "?"— (Ad.) 



I give this under the name it bears in the British Museum, but have a very strong impression 

 that it is the Trochus striolatus, Quoy and Gaimard, " Astrolabe," vol. iii. p. 253, pi. lxiii. figs. 18-22. 



Specimens of this species exist in the British Museum, but without any mark of locality. It does 

 not occur in Australian lists, so far as I know. 



26. Trochus (Diloma) porcifer (A. Adams), (PI. IV. fig. 12). 



Labio porcifera, A. Adams, Monog. Trochid., Proc. Zool. Soc. Lond., 1851, p. 179, sp. 23. 

 June 26, 1874. D'Urville Island, New Zealand, Beach. 



Habitat—" ?"— (Ad.) New Zealand (Brit. Mus.) 



This species seems to have fallen into utter oblivion. Adams' description was not such as to 

 secure its recognition ; no figure of the shell was given ; the very name of the species is omitted in 

 Adams' Genera. Dr Fischer does not give it in Kiener, and in no list of New Zealand species does it 

 seem to occur. Possibly it has passed as Trochus nigerrimus, Gmel. (his Turbo, not his Trochus 

 of that name), which seems to be plentiful, but which is quite distinct. This supposition is con- 

 firmed by a remark of Tapparoni-Canefri on the Trochus {Diloma) nigerrimus, Gmel. (Viaggio d. 

 "Magenta," Moll., p. 66), " Alcune varieta del Trochus araucanus" (D'Orb., a synonym for Trochus 

 nigerrimus, attached by him to the species as found in Chili), " mi parvero avere una grande aua- 

 logia con una specie che nel Museo di Londra porta il nome di Diloma porcifera, ed e della Nuova 

 Zelanda." 



As to the distinctness of the two species, I was glad to have my own estimate confirmed by Mi- 

 Edgar A. Smith, who, with his usual kindness, compared for me D'Orbigny's types of Trochus araucanus 

 with New Zealand specimens of Trochus nigerrimus, Gmel., and further Adams' type of Labio porcifera, 

 with Gmelin's species. As to the first pair, he writes (August 5, 1884), " I find not a shadow of 

 difference, and am certain they are the same species. This is remarkable, as a similar distribution 

 occurs in the case of Banella vexillum {vide Smith, Proc. Zool. Soc, 1881, p. 31)." l 



Then in regard to the second pair he adds, " Trochus porciferus is more strongly spirally ridged, 

 more or less punctate with yellowish, and has the columella porcellanous white, with a pearly depres- 

 sion running up the centre. On the contrary, Trochus nigerrimus has a pearly band scarcely at all 

 impressed, extending from the lower part of the columella right across to the termination of the outer 

 lip above — a feature constant in all stages of growth." 



1 I have thought it important to reproduce this whole note in connection with some doubts expressed by 

 Tapparoni-Canefri on this point in continuation of the very passage quoted above. 



