44 THE VOYAGE OF H.M.S. CHALLENGER. 



of the armature of the large pair of chelate pereiopoda, which exhibits a large hollow- 

 space between the impinging margins of the pollex and the closed dactylos. Even here 

 the male and female differ somewhat. In both sexes the left propodos is larger than the 

 rioht The rierht hand in both is similar ; it is narrower, less serrate, and has the 

 dactylos and the pollex correspondingly impinging throughout their entire length, being 

 quite half as long as the propodos, whereas on the left side the propodos is two-thirds longer 

 than the dactylos, and so broad that it impinges against the antagonising process of the 

 propodos in an oblique direction at the apex, leaving a large open space between it and 

 the base, the propodal margin of which is serrate with several large teeth, whereas that 

 of the dactylos is smooth. 



The second pair of pereiopoda has the propodos long and narrow, not very unlike but 

 more slender than that of the previous species. 



The fifth or posterior pair is quite as robust as tint of the fourth, but has the infra- 

 terminal angle of the propodos fringed with a brush <>f rather long cilia. 



The females were carrying ova, which were very large, and numbered about twenty, but 

 were not sufficiently advanced to enable me to determine the character of the embryo. 



Eiconaxius parvus, n. sp. (PL V. figs. 4, 5). 



Like Eiconaxius acutifrons, except in having the impinging surfaces of the dactylos 

 and dactyloid process of the propodos, of the first pair of pereiopoda, smooth. 



Length, 12 mm. (0'5 inch). 



Habitat. — Station 170, off the Kermadec Islands, July 14, 1874 ; lat. 29° 55' S., long. 

 178° 14' W.; depth, 520 fathoms; bottom, volcanic mud; bottom temperature, 43°. 



This species is distinguishable from the preceding by having the left or larger hand 

 without any teeth on the impinging margins of the dactylos. and pollex or projecting 

 process of the propodos. By the rather long and less lanceolate form of the dactylos on 

 the three posterior pairsjof pereiopoda, and by the less pointed and tooth-like appearance 

 of the infero-posterior angle of the coxal plates of the pleon. 



There was but one specimen of this species taken, and that a female, which is rather 

 smaller than those of the females of the preceding species. 



Observations. — There were seven ova attached to our specimen. These, when com- 

 pared with the size of thejmimal, were extremely large. They were oval rather than round 

 in shape, and measured about 1 mm. in length. Fortunately they were approaching 

 the period when the embryo is ready to leave the ovum ; but having been preserved 

 in spirits, the vitelline substance^had been unfortunately rendered so opaque that without 

 the assistance of reagents there was little to be determined with accuracy. But with 

 their assistance, and careful manipulation, I was enabled to take out of the ovum a 



