1850.] 



07 



39. Potamia latifrons, Randall, is distinct from Boscia dentata, M. Edw. 

 Potamia, as generic name, ought to take precedence of Boscia. 



40. Orthostoma dentata, Randall, forms a genus distinct from the others of the 

 same group. 



49. Macrophthalmus compressipes, Randall, is a distinct species, and is the 

 same as the M. podophthalmus figured in the Voyage of the Boiiite. Priority of 

 publication must determine which name shall prevail. The text of the work I 

 have not seen. 



53. Grapsus cruentatus. The individuals in the Collection of the Academy, 

 belonging to this species, were erroneously regarded by Dr. Randall as new, and 

 were described by him as G. longipes, in the Journal of the Academy, (vol. viii, 

 p. 125.) It was doubtless a mistaken supposition that they were brought from 

 Surinam, as stated p. 126, and this error probably misled Dr. R. 



55. Grapsus rudis, M. Edw., is the same as G. hirtus, Randall, (J. A. N. S., 

 vol. viii, p. 124.) Milne-Edwards' name has priority. With him I regard G. 

 rudis as distinct from G. pictus, though it differs only in the following particulars : 

 the carapace is clothed with numerous but distant transverse lines of hairs; the 

 front is not so perpendicularly turned down ; the four lobes of the front are more 

 tuberculous, and the limbs smaller when compared with the body. There is but 

 one specimen in the collection, but that is in good condition. 



56 and 57. Pachygrapsus crassipes and P. parallelus appear to be distinct from 

 the described species of the genus Grapsus. 



66. Guaia ornata. This is a very distinct and pretty species of the genus 

 Guaia, described by Dr. Randall as Ilia ornata, (J. A. N. S., vol. viii, p. 129,) 

 but it really belongs to the genus to which I have referred it. This error, of 

 confounding the two genera, Ilia and Guaia, has been committed by others be- 

 sides Dr. R., until specimens really belonging to the genus Ilia fell into their 

 hands, when a distinctive character is at once perceived in the peculiar contorted 

 form of the hands in this genus. For want of attention to this point, Myra fugax 

 and Guaia punctata have been confounded with Ilia punctata, many points in the 

 description of each being common. 



68. Ranina' dentata. Two fine specimens. Dimensions of largest : carapace 

 4J inches long, 42 broad ; carapace and abdomen extended, 7 inches ; breadth of 

 hand, finger excluded, li inch, including finger, 2i inches; length of thumb or 

 moveable finger, 1 J inch ; length of one of the first pair of feet, thumb extended, 

 is 7 inches. 



70. Blepharipoda occidentals, Randall. A well marked genus. The indi- 

 vidual is a female; abdomen with appendages, first pair of feet cheliform; hence 

 it is near Albunea, but quite distinct. 



74. Porcellana sociata, Say. In Say's article (J. A. N. S. vol. i, p. 456) the 

 name of this species is given P. soriata. Say's original specimen is still in the 

 collection of the Academy, but the label could not be found to determine how he 

 wrote the name ; there can be but little doubt that the name as printed is a typo- 

 graphical error arising from an imperfection in the manuscript, and that Leach, 

 Desmarest, and Milne Edwards are right in regarding sociata as the true specific 

 name; an imperfectly formed c connected with the preceding letter being easily 

 mistaken for one of the manuscript forms of r. Another example of deviation 



