152 MR T. V. HODGSON ON THE 



they are not very abundant, and the linear arrangement is not distinct ; a distal fringe 

 is conspicuous ventrally on the third coxa, more so dorsally on the femur ; on the 

 second tibia it is ventral, and the setae are distinctly spinous but few in number. Setae 

 are scarce and very small on the tarsus and propodus, and on these joints it is usual to 

 find a ventral row which is to some extent at least characteristic. In this species this 

 row consists of very inconspicuous setae, and placed at comparatively large intervals. 



Three specimens were found among a large number of Chsetonymphon orcadense. 

 They are all adult females, and attention was attracted to them by the peculiar enlarge- 

 ment of the femora. These joints are not enlarged throughout, as in most species, but 

 considerably bellied for about two-thirds of their length. 



Chsetonymphon brevicaudatum. 



Nymphon brevicaudatum, Miers, (20), pp. 200-214. 

 Nymphon horridum, Bohm, (1), p. 172. 

 Nymphon brevicaudatum, Hoek, (15), pp. 49-52. 



Three specimens of this species were taken in Scotia Bay, South Orkneys. They 

 were found amongst an immense number of Chsetonymphon orcadense captured during 

 the autumn and winter of 1903 inside the 15-fathom line. The specimens are: 

 an adult female, an ovigerous male, and a small one of which the sex is uncertain. All 

 of them show the setse of the body arranged in the stellate manner described and 

 figured by Dr HOEK ; but that author distinctly states that the setae are not placed in 

 regular rows on the legs. In these specimens this is a striking feature ; the setae are 

 long and coarse, arranged in five rows, two dorsal, two lateral (and these are the longest), 

 and a single ventral row, where they are shortest but most numerous. This arrangement 

 is most noticeable on the tibiae. Smaller and finer setse are also irregularly distributed 

 over the appendage, but more particularly on the ventral surface of the coxse, especially 

 the third, and the femora. The tarsus and propodus are much more slender than the 

 rest of the appendage, the latter being a little the longer, and here the setae are small 

 and there is a well-developed ventral row ; dorsally and laterally the linear arrange- 

 ment is indistinct. The terminal claw is accompanied by two well-developed 

 auxiliaries. 



The ova carried by the male are not very numerous, but large. 



Chsetonymphon mendosum, 

 Ch&tonyrnphon mendosum. Hodgson, (13), pp. 30-32. 



Specific Characters. Body robust and tapering ; articulation imperfect; lateral processes 

 not widely separated, and with stout spines distally and dorsally ; no fine setae 

 whatever. 



Ocular tubercle short and stout. 



Palp five-jointed ; proportions of last three 5 '5, I '5, 1'G. 



(ROY. soc. EDIN. TRANS., VOL. XLVI., 172.) 



