REPORT ON THE CRUSTACEA MACRURA. 621 



to a rudimentary condition, being only a short, flat point, and beside it stands a three- 

 jointed but rather feeble synaphipod, that is fringed with a few hairs. 



The first pair of siagnopoda is two-branched, one branch being broad, foliaceous, and 

 fringed with hairs. 



The first pair of gnathopoda has a long basecphysis and a mastigobranchial plate of 

 extreme tenuity, with a small podobranchial plume attached. 



The second pair of gnathopoda (fig. 4i) is long, robust and four-jointed ; the first joint, 

 which is the coxa, is short, the second is long, the third and fourth long and distally 

 fringed with spinules. It has no basecphysis attached, but supports a rather rudimentary 

 mastigobranchia that originates in a broad discoidal base, and has no branchial plume. 



The first pair of pereiopoda is short, strong, and chelate, having the basis and ischium 

 anteriorly produced on the lower margin to a prominent tooth ; the coxa supports a 

 rudimentary mastigobranchial appendage, as do all the other pereiopoda except the 

 posterior pair. There is a pair of arthrobranchial plumes attached to the articulation of 

 the second pair of gnathopoda and anterior four pairs of pereiopoda. There are six 

 pleurobranchise, of which the posterior is the largest and the anterior the smallest. The 

 second pair of pereiopoda is long, slender, and chelate, having the carpos long, flexible, 

 and multiarticulate. The three succeeding pairs are long and moderately robust, they 

 have the meros posteriorly fringed with spines ; the propodos is longer than the carpos, 

 and terminates in a short and slightly curved dactylos, that has the posterior margin 

 sharply serrate. 



Merhippolyte orientalis, n. sp. 



Rostrum armed on the upper surface with five or more strong teeth, of which the 

 posterior corresponds with the gastric region, and is smaller than the others. The apex 

 of the rostrum is broken off, and its length cannot therefore be determined. 



The ophthalmopoda are pyriform, and as long as the first joint of the peduncle of the 



first pair of antennae. 



Length, entire, ..... 32 mm. (1-2 in.). 



„ of carapace, . . . . . 8 „ 



,, of pleon, . . . . . 24 ,, 



Habitat. — Station 191, September 23, 1874; lat. 5° 41' 0" S., long. 134°4'30"E; off 

 New Guinea; depth, 800 fathoms; bottom, green mud; bottom temperature, 39°'5. 

 One imperfect specimen. Trawled. 



This specimen is much damaged, but the broken rostrum reaches beyond the extremity 

 of the first joint of the first pair of antennae, otherwise I should have considered it to 

 be Hippohjte spinifrons of Milne-Edwards. 1 It is somewhat difficult to determine exactly 



1 Lot. cit., vol. ii. p. 377. 



