3o8 DISCOVERY REPORTS 



but with a new batch of young eggs. In the largest specimens, ca. lo mm. diameter, 

 I have found no young ones, but the ovaries filled with a number of large eggs (fifteen 

 to twenty in each ovary). There may be one or two gonads at each side of the bursa; 

 particularly when there is only one gonad at each side, these are greatly developed, 

 looking like small, thick sausages, and filling up the disk almost completely. The bursae 

 are seen distinctly, compressed between the gonads and empty, and it is certain that the 

 eggs are lying in the gonads, not in the bursae. This seems to indicate that the develop- 

 ment in this species is intra-ovarial (in the younger specimens it could not be ascer- 

 tained whether the young ones are lying in the bursae or in the ovaries) ; in any case it is 

 inexplicable how all these eggs could possibly get into the bursae. But, as it would seem, 

 it is no less inexplicable how all these numerous eggs (or embryos) find room within the 

 disk of the parent specimen, if they are going to develop to the same size as the young 

 ones found in the specimens of ca. 7 mm. In these largest specimens the gonads appear 

 to be purely female. 



The species is thus not to be characterized as simply a protandric hermaphrodite ; it is 

 at first mainly male, then a breeding female, then again mainly male, and finally purely 



female. 



Ophiolepis paucispina (Say) 



Ophiolepis paucispina, Lutken, 1859. Additamenta ad hist. Oph., u, p. 204, Tab. ii, fig. 2. 



O. paucispitia, Koehler, 1914. Meeresfauna Westafrikas. Echinodernia, p. 177, pi. ix, fig. 14. 



St. 283. 14. viii. 27. Off Annobon, Gulf of Guinea, 18-30 m. i specimen. 



Attention should be called to the fact that this specimen has sometimes two, some- 

 times three arm spines, two being the normal number of spines in this species. Perhaps 

 this is a character proper to the African specimens, which, if so, might be regarded as 

 a variety of the typical West Indian form. 



Ophiogona Doderleini (Koehler) 



Ophioglypha Doderleini, Koehler, 1901. Result. Voyage 'Belgica'. Echinides et Ophiures, 



p. 19, pi. V, figs. 34-6. 

 O. Doderleini, Koehler, 1907. Revision de la collection des Ophiures du Mus. d'Hist. Nat. Paris. 



Bull. Sci. France Belgique, XLi, p. 293. 

 Ophiomaria Doderleini, A. H. Clark, 1916. Ophiomaria, a nezvgetius of Ophiwans from Southern 



South America and the adjacent portion of the Antarctic Co7itinent. Journ. Washington Acad. 



Sci., VI, p. 385. 

 O. Doderleini, Koehler, 1923. Swedish Antarct. Exped. Asteries et Ophiures, p. 126. 



St. 177. 5. iii. 27. 27 miles SW of Deception Island, South Shetlands, 1080 m. 6 specimens. 

 St. 196. 3. iv. 27. Bransfield Strait, South Shetlands, 720 m. i specimen. 



To the description of this species given by Koehler I may add a few remarks. 

 Koehler states that the distal edge of the buccal plates is convex, and it is so represented 

 in his fig. 35- I find it to be straight, or even slightly concave, as shown in Fig. 34 a. 

 Further I find the shape of the dorsal and ventral plates somewhat different from that 

 shown in Koehler's figures, so I have thought it desirable to give new figures thereof. 

 The number of rudimentary dorsal plates at the base of arms, between the radial shields, 



