204 CRUSTACEA. 



dorsal spines are in two series of two or three each; besides which 

 there are two or three below towards apex, and others on the outer 

 surface, which are obsolescent except in the fifth pair. 



Cancer perlatus, HEKBST, i. 265, pi. 21, f. 122. 



Cancer da'ira, HERBST, iii. pi. 53, f. 2. 



Cancer variolosus, PABR., Supp., 338. 



Lagostoma perlata, EDWARDS, Crust., i. 387. 



Cancer (^Da'ira) perlatus, DE HAAN, Faun. Japon., 18. 



As the word perlatus in Latin signifies very broad, and not pearly, 

 as intended by it, we have rejected it for variolosus of Fabricius. 



GENUS CHLOEODIUS, Leach. 



The carapax in the Chlorodii varies in the number of marginal 

 teeth, either by the subdivision of the normal teeth, or by the obso- 

 lescence of some of them. The normal number ./we prevails. In the 

 nudipes, each of the normal teeth consists of two or three teeth, and 

 the whole number is thus ten or eleven; in the sanguineus, the number 

 is seven, there being an intermediate inferior tooth between D and E, 

 and a posterior tooth back of S ; in the niger there are four, the tooth 

 E being obsolete ; and in the cytlierea both E and S are obsolescent, 

 though still distinguishable. 



The areolation of the carapax differs widely ; in some, as the ungu- 

 latus, all the normal areolets are very distinct, and in the monticulosus 

 they are much subdivided ; while in the levissimus all are wanting, 

 and the surface is quite smooth. The process beneath the front ad- 

 joining the outer antennas is broader than long, and the first joint of 

 the outer antennae reaches forward so as to fill very nearly the orbital 

 hiatus. The third joint of the outer maxilliped has the anterior mar- 

 gin concave or emarginate, and is subrectangular in form. 



The genus Chlorodius of De Haan (Faun. Japon., 13), is the same 

 with Atelecyclus; this author, however, supposed his genus identical 

 with Leach's when it was adopted by him. 



The genera Pilodius and Cyclodius are properly subgenera along 

 with Chlorodius, in the same manner as Xanthodes and Paraxanthus 

 are subgenera with Xantho. 



