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



and median portion of the appendage also projects in a rounded extremity fringed with 

 comparatively long slender hairs; this part of the appendage forms a somewhat raised 

 pad which is largely covered with delicate (sensory?) processes, shown at a; beneath the 

 integument is a granular mass of tissue (<jb) in which no structure was discernible, but 

 which may be a nervous ganglion. The above description refers to the appenda 

 when seen from the under surface. 



I suppose that these conjoined plates represent the endopodite of the limb; the 

 exopodites are formed by a somewhat oval plate on either side, which completes the 

 roofing in of the infra-abdominal cavity. 



The second pair of appendages (fig. 13) are evidently, like the first pair, modified 

 to subserve the generative function ; the penial filament is of very great length and 

 projects beyond the termination of the abdomen ; at its base it is somewhat swollen 

 and articulates with a stoutish joint, which is again attached by a smaller joint 

 to a thin plate, and this I imagine to represent the protopodite of the limit ; the 

 joints at the base of the penial filament, judging by other Isopoda, would represent 

 the endopodite ; the basal joint of the limb is long and flattened and somewhat curved, 

 terminating anteriorly and posteriorly in a pointed extremity ; its outer margin is 

 fringed with slender hairs. 



The exopodite is represented by a slender, soft, conical filament, which is covered for 

 the greater part with short delicate hairs. 



Fig. 14 represents one of the third pair of appendages, a portion of which is 

 probably defective ; the exopodite (?) consists of two flattened joints fringed along both 

 margins with short slender hairs; the second joint is pointed at its extremity and 

 terminates in a long slender hair ; the endopodite is a respiratory lamella, broad and 

 long, with three long plumose seta? at its lower margin ; the fourth pair of appendages 

 are entirely respiratory. The uropoda, as already mentioned, are defective'. 



Station 168, off New Zealand, July 8, 1874; hit, 40° 28' S., long. 177° 43' E. ; 

 depth, 1100 fathoms; bottom temperature, 37 '2 F. ; blue mud. 



Station 169, off New Zealand, July 10, 1874; lat. 37° 34' S., long. 170' 22' E. ; 

 depth, 700 fathoms ; bottom temperature, 40 "0 F. ; blue mud. 



Family Munnopsim:. 

 Munnopsis, M. Sars. 



Munnopsis, M. Sars., Forhandl. Vidensk. Selsk., 1860, p. 84. 



The family Munnopsidaa and the genus Munnopsis were instituted by Professor M. 



Sars for the reception of an Isopod dredged by him in moderately deep water off the 



coasts of Norway. This species, Munnopsis typica, was described in a detailed fashion 



by Professor M. Sars, the description being accompanied by numerous illustrations ; the 



