268 Porcellana, sp. 



trated : and this is so precisely the case with the specimens of 

 the animals described by Mr. Hailstone, that this gentleman 

 mentions (p. 264.) the shortness of the rostrum as the cha- 

 racter which excluded it from the genus Macropodia. 



Under such circumstances, I am sure Mr. Hailstone will 

 pardon me for expressing a wish that he, or any other natu- 

 ralist living upon the coast, will strive to throw farther 

 light upon this interesting subject, by endeavouring to ascer- 

 tain, by the examination of specimens captured at different 

 periods of the year, whether intermediate individuals may not 

 be found between that now figured and the adult rostrated 

 Macropodiae. It would be likewise highly desirable to ascer- 

 tain the still earlier stages both of the Macropodia and Hyas. 

 This might easily be accomplished by catching the females 

 with spawn, and confining them until the eggs should be 

 hatched; whereby we should obtain a complete proof or 

 refutation of the singular statements of Mr. J. V. Thompson. 

 — The Grove, Hammersmith, Jati. 28. 1835. 



[When we were (Feb. 21.) on the point of taking all the 

 preceding notices on Crustacea to press we found that Mr. 

 Hailstone had sent us another set of specimens of the Porcel- 

 lana described in p. 265, and the following notice on them. 

 This he had done without our having made the least inti- 

 mation to him of Mr. Westwood's views on the case, and 

 the coincidence of views thus proved we think interesting.] 



In my last communication I sent you descriptions of two 

 species of Porcellana which I am now convinced are but one 

 in different stages of growth, as will appear from the speci- 

 mens which I forward you, and, accordingly, I beg you will 

 substitute the accompanying description, made from the 

 largest specimen I have seen, for the other two. 



[We have not done this, because our engraving [Jig. 28.) 

 had been prepared, and because Mr. Westwood's remark 

 above teaches us that information on the stages of growth 

 in Crustacea, which the giving of all Mr. Hailstone's de- 

 scriptions supplies, is very interesting. Mr. Westwood has 

 drawn a figure {Jig. 29.) of one of the suite of specimens now 

 received from Mr. Hailstone. The largest sent had become 

 loose in the box, and very much broken.] 



Genus Porcellana, sp. (fig. 29. c, very young.) 

 Front of the shell with three denticulated teeth, the middle 

 one depressed at its point, and channeled down the middle ; 

 behind each eye two lobes; behind that the shell is faintly 



