214 "THETIS " SCIENTIFIC RESULTS. 



legs. The second pair of legs has each a well developed two- 

 jointed exopod. The latter appendages, if present on the first 

 legs of the male or on both first and second in the female, are so 

 small that they have eluded all my efforts to isolate them and 

 distinguish them from the stout branched setfe. 



Incubatory pouches occur in pairs on the second to fifth 

 segments. 



The young when ready to leave the marsupium have the eyes 

 conspicuously pigmented; the first joint of the first antennae 

 possesses only one spine, situated about the middle on the inner 

 border. The larger flagellum has but three joints and exceeds 

 the smaller in length by about one-fifth. The second to the sixth 

 pairs of legs have the imperfect joint of the dactylus well defined 

 and the rasp-like spines of full size, but not so numerous as in 

 the adult. The seventh pair of legs and the pleopods are wanting 

 in all the specimens examined. 



The predominating features of this most curious and interest- 

 ing form indicate its close relationship to the family Apseudidse. 

 The ocular lobes, antennae and mouth parts are very similar in 

 structure, yet there are certain differences, such as the absence of 

 the antennal scale and the small size of the second antennae, which 

 are scarcely equal to the stout, well developed palp of the mandible. 

 The slightly tapering body and the presence of a conspicuous 

 exopod on the second pair of legs afford further evidence. Here 

 I may state that after examining very many specimens I failed 

 to find the exopods except in one male, in which they are very 

 conspicuous on the anterior bases of the second legs, but I could 

 not detect any trace of them on the first pair. 



Many of the remaining characters display an affinity with the 

 family Tanaidae, such as the almost smooth body, the second pair 

 of legs not having the distal joints dilated, the small size of the 

 coxal plates and the absence of a forward process on the first 

 pair, the semi-coalesced condition of the first five segments of the 

 pleon, which consists of hoop-like rings, without side processes 

 and devoid of visible nodes of articulation, the frequent absence 

 and rudimental character of the pleopods, and the short, few- 

 jointed rami of the uropods. 



Colour, of body and limbs, creamy-white. 



About one hundred specimens, obtained off Cape Three Points, 

 Port Hacking, Botany to Jibbon, and Wata Mooli, in 20-59 

 fathoms. 



