26o DISCOVERY REPORTS 



O. stelliger is viviparous and hermaphrodite. There are two to three gonads on the 

 interradial, one on the adradial side of each bursal sht; it is the single gonads which are 

 hermaphrodite, containing both sperms and eggs at the same time. 



Only a single egg develops at a time, and apparently only one at a time in each 

 interradius. The young ones reach a large size and may be discerned quite distinctly 

 through the thin, rather transparent skin of the dorsal side of the disk. This is some- 

 thing quite unusual ; it is due to the fact that the stomach does not, as is usual, spread 

 over the whole dorsal side, by its dark colour concealing the underlying embryos, but is 

 compressed between the young ones, squeezed into narrow strands, forming a kind of 

 reticulation between the young ones. 



In one gonad I observed something recalling the curious parasitic organism Nidrosia 

 ophiiirae, which I have described from Ophiiira Sarsi (Danish 'Ingolf Exped. 

 Ophiuroidea, p. 74). I cannot, however, state definitely that it is the same. 



Family OPHIOCOMIDAE 

 Ophiocoma Bollonsi, Farquhar 



Ophiocoma Bollonsi, Farquhar, 1908. Description of a neio Ophiurid. Trans. N. Zealand Inst., 



XL, p. 108. 

 O. Bollonsi, H. L. Clark, 1921. The Echinoderm Fauna of Torres Strait. Publ. Carnegie Inst., 



214, p. 132. 

 O. Bollonsi, Mortensen, 1924. Echinoderms of New Zealand and the Auckland-Campbell Islands. 



II. Ophiuroidea. Papers from Dr Th. Mortensen 's Pacific Exped., xx (Vid. Medd. Dansk 



Naturh. Foren., 77), p. 120. 



St. 941. 20. viii. 31. 40° 53' S, 174° 47' E, Cook Strait, New Zealand, 128 m. i specimen. 



Although the spines of this specimen can scarcely be said to be canaliculate, there is 

 no doubt that it belongs to O. Bollonsi, Farquhar. Some of the spines are club- 

 shaped, on account of some kind of parasitic organism, as mentioned in my paper of 

 1924 (p. 122). 



Each dorsal arm plate has a narrow, white transverse band, the ground colour being 

 brownish. This gives the arms a finely banded appearance. 



Ophiopsila guineensis, Koehler 



Ophiopsila giiineensis, Koehler, 1914. Meeresfauna Westafrikas. Echinoderma, p. 203, pi. viii, 



figs- 1-4. 7-8. 

 St. 283. 13. viii. 27. Off Annobon, Gulf of Guinea, 18-30 m. 2 specimens. 



To Koehler's description of this species I would only add that the ventral interradii 

 are naked proximally, and that the disk, which is preserved in one of the specimens, is 

 whitish with black, not reddish brown spots, as was the case in the types. Otherwise 

 these specimens are in good agreement with Koehler's description. 



