274 DISCOVERY REPORTS 



outer edge. Arm spines short, conical, four to five at the base of the arm. No tentacle 

 scale. Colour in alcohol greyish white. 



This species is viviparous. In the larger specimens I have only exceptionally found the 

 embryos so far developed as to show the first rudiments of the skeleton ; but in a smaller 

 specimen I found fully developed young ones, ready to leave the mother. There appear 

 to be generally only one or two embryos at a time in each interradius. 



The gonads are hermaphrodite, and there is generally only one gonad in each interradius. 

 There are no normal genital slits, but in specimens ivith ripe genital products a single, short 

 and very narrow genital slit appears at the adoral end of the interradius, on one side, close 

 to the buccal shield ; sometimes there may be two genital slits in one of the interradii, 

 viz. in cases where there are two gonads in the interradius, there is then one slit to 

 each gonad. That the development must be intra-ovarial is clear, since there is no 

 bursa. 



The genital slit (the specific name mo?iorima refers to the fact that there is usually only 

 one slit in each interradius) is, of course, not homologous with the normal genital or bursal 

 slits of Ophiuroids ; it is a new formation, corresponding to the pore that develops oppo- 

 site each ovary in Ophiopus arcticus (cf. Mortensen, Uber Ophiopus arcticus, Zeitschr. 

 wiss. Zool., LVi, 1893) and to the genital pore in Amphilepis (cf. Mortensen, Handbook 

 of the Echinoderms of the British Isles, 1927, p. 222; Danish ' Ingolf ' Exped., Ophiur- 

 oidea, 1933, p. 56). 



In this character of its genital slits this species is unique among Amphiurids. In its 

 other characters it seems to be related to Amphiura tomentosa, Lyman. 



Amphiura Lymani, Studer 



Amphiura Lymani, Studer, 1885. Die Seesterne Siid-Georgiens, nach der Aiisbeute d. deutschen 



Polarstation in 1882-3. Jahrb. wiss. Anst. Hamburg, n, p. 163, Taf. n, fig. 10 a-b. 

 Amphiodia Lymani, H. L. Clark, 1915. Cat. Recent Ophiurans, p. 250. 



St. 45. 6. iv. 26. 27 miles S 85° E of Jason Light, South Georgia, 270-238 m. 6 specimens. 



St. 141. 29. xii. 26. East Cumberland Bay, South Georgia, 17-27 m. 7 specimens. 



St. 145. 7. i. 27. Stromness Harbour, South Georgia, 26-35 m. 2 specimens. 



St. WS 33. 21. xii. 26. 54° 59' S, 35° 24' W, South Georgia, 130 m. 6 specimens (young). 



St. MS 71. 9. iii. 26. East Cumberland Bay, South Georgia, 110-60 m. i specimen. 



It may seem somewhat bold to maintain that the above specimens, represented in 

 Figs. i^a~c, are identical with Studer's Amphiura Lymani, as figured by Studer 

 {op. cit.). Judging from Studer's fig. 10 b this species would be an Amphiodia, to which 

 genus Clark, thus far correctly, referred it. Nevertheless there is no doubt that these 

 specimens are actually Amphiura Lymani. Through the kindness of Dr A. Panning of 

 the Hamburg Museum, I have had the type material sent to me for examination. There 

 are in all four specimens, two of which, almost completely destroyed by fungi, are 

 evidently not Amphiura Lymani, but probably Amphiodia affinis. The two others are in 

 fairly usable condition, the better of them being, however, again an Amphiodia ajfmis. 

 Thus only the fourth specimen remains as the type of Amphiura Lymani, and although 



