REPORT OX THE CRUST.UKA M A.CKU RA. 11 



Family Thaimastouhelid.k. 



First pair of antenna with flagella long, second with scaphocerite ; first pair of pereiopoda unequal, chelate, 

 large ; second symmetrical, chelate, small ; rhipidura foliaceous ; branchiaj filamentous cylindrical ; podo- 

 branehire and mastigobranchise present. Genera Thaumastocheles, Callocarw. 



Family Pylochelida 



The carapace has no rostrum, and its lateral walls are compressed and very deep. 

 The eyes stand on peduncles of moderate length. The first pair of antenna? terminates 

 in two short flagella, and the second supports a small scaphocerite. The mandibles 

 carry a synaphipod. The first pair of pereiopoda is subequal, chelate. Second and third 

 pairs long and slender, each terminating in a long styliform dactylos. Fourth and fifth 

 pairs are short, and terminate in a small, and more or less rudimentary dactylos. 

 Rhipidura with the branches rigid and tapering ; outer larger than the inner. Telson 

 rigid anteriorly, and flexile posteriorly. 



The respiratory apparatus is trichobranchiate. The filaments are long, slender, and 

 cylindrical. The podobranchial plumes and mastigobranchial plates are wanting 

 throughout all the appendages of the pereion, that is, from the first pair of gnathopoda 

 to the posterior pair of pereiopoda. 



This family is established to receive the genera Pomatocheles, Miers, Pylocheles, A. 

 .Milne-Edwards, and Cheiroplatea. 



The name is derived from that given to a genus by A. Milne-Edwards, and includes 

 all those paguriform Anomura that are trichobranchiate. 



Cheiroplatea, 1 n. gen. 



Carapace having deep lateral membranous walls, produced anteriorly in advance of 

 the dorsal frontal margin. 



Ophthalmopoda broadest at the base, and tapering gradually to the apex. 



First pair of antenna} having the peduncular joints long, each capable of being folded 

 upon the preceding, and terminating in two slender flagella that arc longer than the 

 third joint of the peduncle. 



Second pair of antenna? having a strong and small scaphocerite attached to the peduncle. 



Mandibles carrying a triarticulate synaphipod. 



Second pair of gnathopoda imperfectly chelate, and carrying a basecphysis. 



First pair of pereiopoda with the two limbs correspondingly equal, being large 

 and well developed, having the anterior or upper surface of the carpos and propodos 



1 x-'Pi hand ; ^'Act-rvs, Mat ; this name was chosen and the plate printed before I became aware that the somewhat 

 similar name Ghiroplatys had beeu previously used by Kirby for a genus of Diptera. 



