264 Macropbdia IVhalangium. 



(c) 6-jointed, carinated ; first joint broad and longest; second, 

 narrower and shorter ; third, as broad as the first, and 

 shorter; fourth, fifth, and sixth of the same breadth, the 

 fourth being as long as the second ; the fifth shorter, and the 

 sixth abruptly narrow and arcuate. — Legs. Anterior pair 

 shortest and thickest, equal, didactyle, as long as the body ; 

 hands slightly compressed. Four hinder pairs very long and 

 slender. The claws of the two anterior of the four hinder 

 pairs slightly hooked at their extremity; those of the two 

 posterior pairs arcuate. 



This crab I have found very abundantly along with the 

 preceding one. (Jig. 26.) I am at a loss to what genus to 

 refer it. The shortness of the rostrum will preclude its being 

 placed among the Macropodiae, to which genus its characters 

 in other respects are most nearly assimilated. All the indi- 

 viduals I possess are males. The length of the shell of the 

 largest is about one tenth of an inch. — St. Leonard's, Hast- 

 ings, July 11. 1834. 



[We, subsequently to receiving the preceding descriptions 

 from Mr. Hailstone, asked him to favour us with sketches, or 

 a sight, of specimens, of the animals. He sent us on Nov. 7, 

 1834, specimens of the Pontophilus, Hyas, and Macropodia, 

 already described ; and specimens of a form of Porcellana, 

 accompanied by the following descriptions of two forms re- 

 ferable to this genus : — ] 



Along with these specimens, of which you have descriptions 

 of mine, i. e. a species of Pont6philus, another of Hyas, and 

 a species allied to the Macropodiadae, I send you two distinct, 

 as they appear to me, species of Porcellana, both of them dif- 

 fering from the P. platycheles. I should be obliged to you 

 to submit them to the judgment of your adviser in Crustacea. 

 I send you descriptions of them, in case they should prove to 

 be undescribed species ; but, as I can hardly suppose this to 

 be the case, I shall be obliged for their specific names when 

 you return me the specimens. Of the smaller species there 

 are four specimens, but, I am sorry to say, very imperfect ones. 



Should any of the species represented in the specimens sent 

 prove to be known ones, I shall be glad to receive their names, 

 and a reference to the book in which they are described. 

 Probably you could inform me whether there is any manual 

 describing all the species of Crustacea known. I possess 

 Leach's Malacostraca Podophthalma Britannia, and Samouelle's 

 Entomologist's Compendium, containing an abstract of Dr. 

 Leach's arrangement, and a description of each genus, and of 

 one species of it. I have, also, the Regne Animal, with Latreille's 

 arrangement; but this does not describe more than the genus. 



