OPHIOLEPIDAE 



323 



tion " nothing can be concluded, of course. But the excellent figures given by Clark 

 {op. cit., 191 5), evidently from a co-type, agree perfectly with O. Martensi, so that it 

 seems quite safe to conclude that they are identical. This also accounts for the fact that 

 O. inermis has never again been recorded. 



The specimens from St. WS 818 are very young and the identification not altogether 

 certain; but those from St. WS 244 are adult and quite typical, so that the occurrence of 

 the species as far north as the Falkland Islands is beyond doubt. 



The species is viviparous, but apparently not hermaphrodite. I have found males only 

 among the smaller specimens, 4-5 mm. diameter. In no case was there any indication 



Fig. 39. Ophiwolepis Martensi (Studer). Part of oral side {a) and dorsal side {h). 

 Part of arm in side view (c). xi2. 



of young eggs developing within the testes, or of spermatozoa within the female gonads, 

 so that the species evidently has separate sexes. There are usually two gonads at the 

 interradial, one or two at the adradial side of the bursal slits. I have found five to six 

 young ones, all in the same stage of development, in each bursa. In specimens con- 

 taining large young ones the disk is quite swollen, almost hemispherical, as Koehler 

 describes and figures it {op. cit., 1922, p. 78, pi. Ixxxviii^), though without suspecting 

 the cause of it. 



O. Martefisi was not hitherto known from off Marion Island or from anywhere in the 

 Kerguelen region. 



In contradistinction to O. gelida this species is never covered with sponges, very 

 rarely a single Foraminifer may be found to have attached itself upon it. Concentric 

 rings, so characteristic of O. gelida, are never distinct on the disk plates. 



