CIDARIDAE 213 



St. WS 86. 3. iv. 27. 53° S3' S, 60° 34' W, 147-151 m. i small specimen. 



St. WS 88. 6. iv. 27. 54° 00' S, 64° 57' W, 118 m. 2 specimens. 



St. WS 90. 7. iv. 27. 13 miles N 83° E of Cape Virgins Light, Argentina, 52° 18' S, 68° 00' W, 

 82 m. I specimen. 



St. WS91. 8. iv. 27. 52° S3' S, 64° 37' W, 191-205 m. i specimen. 



St. WS 92. 8. iv. 27. 51° 58' S, 65° 01' W, 143-14S m. 2 specimens. 



St. WS 93. 9. iv. 27. 7 miles S 80° W of Beaver Island, West Falkland Islands, 130-133 m. 

 2 young specimens. 



St. WS 98. 18. iv. 27. 49° S4' S, 60° 35' W, 171-173 m. 2 specimens. 



St. WS 576. 17. iv. 31. 51° 3S' S, 57° so' W, 34-24 m. 5 specimens. 



St. WS755. 2i.ix. 31. 5i°39'S, 57°39' W, 7sm. s specimens. 



St. WS 816. 14. i. 32. S2° 10' S, 64° 56' W, 150 m. 3 specimens. 



St. WS 818. 17.1.32. 52° 31' S, 63° 2s' W, 272-278 m. 3 specimens. 



St. WS 823. 19.1.32. S2° 14' S, 60° 01' W, 80-95 m. I specimen. 



St. WS 824. 19. i. 32. 52° 29' S, 58° 27' W, 146-137 m. 2 specimens. 



St. WS 825. 19. i. 32. 50° 50' S, 57° 13' W, 135-144 m. 3 specimens. 



St. WS 837. 3.11.32. 52° 49' S, 66° 28' W, 98-102 m. Several (young) specimens. 



St. WS 847. 9. ii. 32. 50° 16' S, 67° 57' W, 51-56 m. i specimen. 



From St. WS 85 there is a very fine specimen carrying a great number of embryos on 

 the apical system. As a photographic figure of a specimen of this species carrying young 

 ones has never been given, the drawing pubUshed by Wyville Thomson (Journ. Linn. 

 Soc. Zool., XIII, 1876, p. 65; The Atlantic, 11, p. 224) being the only figure hitherto in 

 existence, I take the opportunity of giving here a photographic figure of the present 

 specimen. It has one of its primary spines covered by a colony of an Ascidian, another 

 by a sponge, while a third carries a thick lump of a Bryozoan, and others carry small 

 Spirorbis tubes. The upper primaries are pointing straight upwards, not bent so as to 

 cover the apical system ; the young ones are held together in a large mass between these 

 upright spines ; apparently they do not use their tube feet for attaching themselves to the 

 spines of the mother. 



Eucidaris tribuloides (Lamk.) 



(Plate I, figs. 13-15) 



Eucidaris tribuloides, Mortensen, 1928. Monogr. Echinoidea. I, Cidaridae, p. 400. 



St. I. 16. xi. 25. Clarence Bay, Ascension Island, 16-27 "^- 12 specimens. 

 St. 283. 14. vlll. 27. Off Annobon, Gulf of Guinea, 18-30 m. 15 specimens. 



These specimens again raise the question whether the form of Eucidaris from 

 Ascension, which was designated by Koehler as Cidaris minor, should be regarded as a 

 separate variety of Eucidaris tribuloides, or even as a separate species, or simply united 

 with the typical E. tribuloides. In my Monograph of the Cidaridae (pp, 405-6) I came 

 to the conclusion that there is no reason to distinguish it even as a variety. 



The specimens in hand from Ascension are all very alike in regard to the markedly 

 verticillate primary spines and the brown-banded secondaries. On comparing them with 

 specimens of corresponding sizes from the West Indies it is evident that, besides the 

 much more verticillate character of the primary spines, the Ascension form has in 

 general a conspicuously larger peristome (cf. Plate I, figs. 13 and 15); the apical system 



