l6o CRUSTACEA MALACOSTRACA. III. 



of the second pair of thoracic legs differs widely in several particulars from my fig. 2 h. The result 

 was, that I found it necessary to establish my species as new. - - It may still be pointed out that on 

 Beddard's figure of the animal the limits between the three posterior thoracic segments are evidently 

 extremely wrong. 



It is easy to separate even very mutilated specimens of M. eximius from Pseudomunnopsis Bcd- 

 dardi Tatt by the fact that the latter has a transverse row of stiff setae on the head at the base of 

 the clypeus, but such setae are absent in M. eximius. 



Occurrence. Taken by the "Ingolf" at two stations in the warm area. 



Davis Strait: Stat 24: Lat 63o6' N., Long. 56oo' W., 1199 fath., temp. 2-4; i spec. 

 Stat 36: Lat. 6i50 r N., Long. 562i' W., 1435 fath., temp. 1-5; 6'/ 2 spec. 



Besides it has been captured by the "Thor" at the two following places. 



South of Iceland: Lat. 62 57' N., Long. ig^S' W., 508 fath.; i spec. 



South-West of the Faeroes: Lat 6ii5' N., Long. 935' W., 463515 fath.; i spec. 



The species is in all probability pelagic, but occurs only at considerably distance from the 

 surface of the sea, as it has never been taken in the numerous vertical hauls from 100 to o fath. 



Pseudomunnopsis n. gen. 



Description. Allied and similar to Munnopsoidcs, but differing in the following characters. 

 Maxillae (PI. XIV, fig. 3d) with the two rami somewhat less slender. First pair of thoracic legs 

 (fig. 3g) robust; fifth joint only as long as the sixth, thick and with some slender spines on the lower 

 margin; sixth joint slender. (The three following pairs lost). Natatory legs with no, or at most very 

 few, setae on the posterior margin of fifth joint, otherwise as in Munnopsoidcs. The median lamella 

 of the male operculum (fig. 3 h) very narrow, broadest at the base and not far from the end, where 

 each pleopod terminates in a short setiferous lobe (fig. 3 i). Second pair of male pleopods (figs. 3k 

 and 3!) fused, forming a large suboval plate with a somewhat deep posterior incision, one-fourth or 

 somewhat more of its total length, and in this very oblong incision, which is narrowed at the distal 

 end, the quite small copulatory organs are found, and these organs reach scarcely to the hind margin 

 of the plate. 



Remarks. The genus is established on Munnopsoidcs Beddardi Tatt. 



105. Pseudomunnopsis Beddardi Tattersall. 

 (PI. XIV, figs. 3a- 3 ni). 



1905. Munnopsoides Beddardi Tattersall, Isopoda, p. 26 and 73; PI. VI, figs, i 8. 



Description. Outline of the body nearly as in M. eximius. -- The head has a transverse 

 row of stiff setae (figs. 3 33 b) along the anterior margin at the base of the clypeus. Antennulae 

 and the four proximal joints of the antennas nearly as in Al. eximius. - - Maxillipeds (fig. 3 e) a little 

 broader than in the last-named form; fifth joint with about five spines at the outer (anterior) margin 



