317 



Mangilia alucinans, Sowerby, Proc. Mai. Soc, London, 1896, 

 vol. ii., p. 29, pi. iii., fig. 12. Type locality— "Yankiihlla Bay" ; 

 var. ornata, Sowerby, loc. cit., pi. iii., fig. 13; Pritchard and 

 Gatliff, op. cit. supra, p. 175, "Victorian coast"; Tate and May, 

 loc. cit. supra, "Long Baj^ Tasmania." 



Mr. Sowerby says of M. alucinans : — "Shells of this 

 species have been mistaken for M. vincentina, Crosse, and 

 also for M . lineata, Reeve. The type of the former is a little 

 plain brown shell, with very obscure bands of darker brown. 

 It is more sharply angular, and the ribs are thinner than 

 in M. alucinans." 



Mr. Angas in P.Z.S., 1877, p. 185, records M. vincen- 

 tina for New South Wales, and remarks: — "The figure given 

 in the French Journal of this species is so bad, no one could 

 recognize it. The shell is white, with a row of brown spots 

 between the ribs a little below the sutures, and sometimes 

 with a central band on the last whorl. Crosse figures it of 

 a uniform brown colour." This figure seems to have ex- 

 cusably m_isled Mr. Sowerby as to the appearance of Crosse's 

 type, and he calls it "a little plain brown shell." Crosse 

 describes his shell as "lutescens," and Sowerby his as "strani- 

 inea," both equal to "yellowish" ; Angas says the former is 

 white, and Sowerby says of the latter, "Some are nearly 

 white." As to M. vincentina being a little shell, it is really 

 described as 7 mm. long, which is half a millimetre longer 

 than M. alucinans. Angas recognized Port Jackson shells 

 as the species he had sent to Crosse from South Australia, 

 and examples sent me from New South Wales by Mr. Hedley 

 as M . vincentina are identical with the type and cotypes of 

 M. alucinans returned to me by Mr. Sowerby. The type 

 localities of the two species are practically the same. Rapid 

 Bay and Yankalilla Bay being adjacent to each other in 

 Gulf St. Vincent; and it is significant, too, that Mr. So-werby 

 says, "Among all the South Australian shells I have exam- 

 ined, none are quite conformable to Crosse's type of this 

 species," and yet Angas and I dredged our specimens in 

 almost the same spot. 



In the collection of the late Professor Tate, which came 

 into my possession, was a tray with rather more than 200 

 shells labelled Mangelia vincentina, St. Vincent Gulf. Of 

 these nearly one-half were like Sowerby's type of M. aluci- 

 nans, and the remainder were the stouter, more coloured 

 form approaching his variety ornata. Angas in P.Z.S., 

 London, 1880, p. 415, begins a paper thus: — "Several months 

 ago I received from Professor Ralph Tate, of the Adelaide 

 University, a small collection of marine shells obtained by 

 him (mostly from shell -sand) on various beaches in St. Vin- 



