Mr. P. H. Gosse 07i Artificial Sea Water. 17 



margine anfractuum elevatiusculo, lineari, intus lubrico, umbone 

 centrali exiguo munito. 



From specimens which reached London ahve, from the Concan, 

 near Bombay. 



Cyclostoma marginatum, Chemn. 



Under this name Pfeiffer cites Turbo marginatus, Ch., from 

 Coromandcl, in his hst of doubtful species Mon. p. 313, with 

 the observation that it may rather be a Bithinia. The latter 

 supposition is correct. I have this shell, clearly indicated by 

 Chemnitz, sent by Dr. .Jcrdon from the Carnatic, and by Mr. 

 Edgar Layard from Jaffna in Northern Ceylon. It is the shell 

 which Souleyet (Voy. de la Bonite, vol. ii. p. 547. t. 31. f. 19- 

 21) has described and figured as Valvata sulcata, from a pond 

 near Pondichery, although he has omitted to describe the deli- 

 cate strife by which the spiral ridges are decussated. Souleyet 

 has erred in ascribing the shell to Valvata. The testaceous 

 operculum confirms its place in Bithinia. Souleyet says it is 

 " vix spiraliter striatum ;" his engraver exhibits an operculum 

 with concentric stria?. The truth evidently lies between, and, as 

 in other Bithinia, there must be a central spiral nucleus, fol- 

 lowed by concentric laminae. Unfortunately my specimens are 

 destitute of opercula. The shell will henceforth stand as Bithinia 

 [Turbo) marginata, Ch. 



Spa, 24th November 1854. 



IV. — On Artificial Sea Water. By Philip H. Gosse, A.L.S. 

 To the Editors of the Annals of Natural History. 

 Gentlemen, 



If Mr. Warington supposes that I obtained from him one atom 

 of information previously unknown to me, on the subject of 

 making sea- water from its constituent salts, he is most thoroughly 

 mistaken. He is no less wrong in saying that I "consulted" 

 him ; since I merely mentioned what was on my mind in familiar 

 conversation. 



With this, however, the public are of course not concerned, 

 and I shall say no more on that head. 



Such of your readers as have felt interested in the matter may 

 be assured that I have not deceived them, in the statement that 

 the simple formula given in the ' Annals ' for July 1854 will 

 make sea-water, in every respect fit for an aquarium, and capable 

 of supporting animal and vegetable life. 



Ann. i^ Mag. N. Hist. Ser.2. Vol.xw. 2 



