*^As\nA)i(n/i(i//ii(n\\e rostral hornsaretwo; they arelongand 

 divergent, but at their base there is a supra-orbital spine which 

 in Anamalhia is wanting-, and the orbital region offers special 

 characters. The orbit is more complete than in the Crustacea of 

 the neighbouring groups, and the eye is retractile hiding in a 

 groove left between the carapace and a flattened projection 

 behind the orbit. The basal joint of the external antennae is un- 

 armed, and juts out a little so as to form a sort of orbital platform; 

 it is flattened below: the movable portion of the antennae at its 

 insertion is partially concealed under the rostrum, of which, being 

 short, it does not reach the apex. The carapace is piriform, and 

 its salient parts generally form flattened protuberances, which are 

 somewhat analogous to the fungiform productions of the body in 

 the genus Euryiwmc- The external maxillipeds are remarkable 

 for the rounded form of the antero-external angle of the fourth 

 joint, the opposite angle being truncate to receive the articulation 

 of the palp." The feet are long and strong, the fingers of the 

 chela are sharp. The first ambulatory foot reaches beyond the 

 others; its joints are cylindrical, and end in a finger slightly 

 curved and apically acute. The pleon has seven segments, and is 

 without spines ; in the male the seventh segment is narrow and 

 attenuate at the end ; in the female it is very broad. The 

 branchlce and the appendages are of the normal oxyrrhynchal 

 type. 



The authors of this definition assign to the genus only Scyra- 

 viathia carpcntcri (Norman) and Scyraiiialhia occidciitalis (Faxon). 

 They do not agree with Faxon in placing these species in 

 Anarnathia, because the type of the latter, A. rissoaiia (Roux), 'is 

 well characterized by its small orbits, with upper margin i:ntire, 

 and without pre-orbital and post-orbital spines. They remark that 

 the American species of Anamathia. A- hystrix (Stimpson), A. 

 crassa, A. M.-Edw. (including A- agassizi, S. I- Smith). A. 

 tanneri. Smith, and A. modcsia (Stimpson), all have orbital spines, 

 and might thus be distinguished from A- rissoaiia, forming a 

 gradual transition to Scyrajiialliia. But at all events, they con- 

 clude, the latter is distinguished from the former ' by the external 

 widening which the basal joint of the second antenna? forms 

 under the orbit, by the absence of spines upon that joint, and, 

 lastly, by the transformation of certain dorsal spines of Aiiamalh.ia 

 into low tubercles, ordinarily truncate at the extremity.' Scyra 

 umbonata, Stimpson. which A- Milne-Edwards had transferred 

 to Scyrainafhia, is indirectly withdrawn trriu ii by the joint 

 authors. After alluding to the suspicion entertained by Sars that 

 Stinrpson's species might even prove to be identical with Scyra- 

 malliia carpcntcri. they say, " it is easy to determine the profound 

 dift'erences which separate these two crustaceans, not only in 



* The authors use the expression " tigclle mobile " to designate the last three 

 joints of the third maxillipeds, and also the niovab'e pait of ihc second antennae, 

 including stem joints and flagellum. 



