26 [March, 







of our naturalists regard it as identical with Hyas coarctata of the British coasts. 

 I have had no opportunity of comparing specimens from both shores of the 

 Atlantic, but the American species appears to me to resemble most Hyas aranea, 

 judging from the figure in Herbst's work. 



9. Mithrax spinosissimus. The specimen in the collection is of unusual size. 

 Carapace 7 inches in length, as many in breadth, and 3 inches thick; hand and 

 finger 7 inches long, 2J broad; whole length of one of the first pair of feet 13 

 inches. 



12. Pericera cornuta. This specimen has been described by Dr. Randall 

 (Jour. Acad. Nat. Sci., vol. viii., p. 108) as Chorinus armatus. It does not 

 belong to the genus Chorinus, as the orbits of the eyes are not incomplete, as 

 they are in that genus, but embrace the peduncle of the eye on all sides like a 

 tube, allowing no other motion to the eye than that of retraction or protrusion. 

 On comparison, Dr. R.'s description will be found to agree in general with that 

 given by M. Edwards of Pericera cornuta, (Hist. Crust., tome I, p. 335,) and a 

 reference to the figure given in Hughes' Nat. Hist, of Barbadoes, pi. 25, fig. 3, or 

 to Herbst, pi. 59, fig. 6, will complete the proof. 



13 and 14. Epialtns Nuttalii and productus Randall appear to be new and well 

 marked species. 



22. Pseudocarcinus raercenaria is the Cancer mercenaria of Say, (Jour. Acad. 

 Nat. Sci., vol. I, p. 448,) abundant along our southern coast. It is referred by 

 M. Edwards, with some doubt, to the genus Xantho of Leach, (M. Edw. Hist. 

 Crust., tome I, p. 399,) but I have no hesitation in referring it to his own genus 

 Pseudocarcinus, and am disposed to think that he had it before him when writing 

 his description of Pseudocarcinus ocellatus, (op. cit., p. 409.) His description 

 applies in every particular, but is short. The country of his specimens he says 

 is unknown. 



25. Platycarcinus productus, Randall, is a distinct species from the three others 

 known. 



28. Trapezia cymodoce. The specimens in the collection agree exactly with 

 Guerin's figure, (Voy. Coq. Crust., pi. 1, fig. 4.) M. Edwards' remarks are 

 very just with regard to the difference between Guerin's Trapezia cymodoce, 

 and the Cancer cymodoce of Herbst. 



33. Lupa cribraria. The crab of our southern coast described by Say as Lupa 

 maculata, (J. A. N. S., vol. I, p. 445,) appears, by Edwards' description and 

 figure, (op. cit., tome 1, p. 452, pi. 17,' fig. 1,) to be same as Lamarck's Por- 

 tunus cribrarius, (Anim. sans Vert., tome V., p. 259, and 2^- edit., t. V., p. 

 476.) Say's paper was read Dec. 1st, 1818, and Lamarck's fifth volume was 

 published, as declared by the title page, in July, 1818, and his name has right of 

 priority, and I have therefore adopted it. 



35. Lupa pelagica. This specimen has Say's original label affixed, and is 

 doubtless one of the specimens described by him in the Jour. Acad., vol. I, p. 97. 

 It is not the L. pelagica of M. Edwards, and does not appear to be the young of 

 the L. dicantha common along our coast; but further examination is requisite to 

 determine what claims it has to be considered new. 



He refers, through mistake, to pi. 18, fig. 1. 



