A. H. CLARK: THE CRICOIDS OF THE INDIAN OCEAN. 119 



Other Records. — Hong Kong; Singapore; Sydney, New Soutli Wales; 

 Amboina. 



CRASPEDOMETRA ATER. 



Craspedometm aler 1911. A. H. Clark, Proc. U. S. Nat. Mus., vol. 40, p. 21. 

 Habitat. — Red Sea. 



CRASPEDOMETRA MADAGASCARENSIS. 



C'raspedometra mculagascarensis 1911. A. H. Clark, Proc. U. S. Nat. Mus., vol. 

 40, p. 23. 

 Habitat. — Madagascar. 



CRASPEDOMETRA AMBOINA, sp. nov. 



Antedon ludovici l89l. Hartlaub, Nova Acta Acad. German., vol. 58, No. 1, 

 p. 29, pi. 1, figs. 7, 8. 



Description. — Centrodorsal large, slightly convex, the dorsal pole often 

 finely pitted ; cirrus sockets arranged in two irregular rows. 



Cirri about XXV, 35-40, about ?5 mm. long ; none of the cirrus segments are 

 longer than broad ; the outer bear small dorsal tubercles, and the terminal some- 

 times prominent spines. 



Radials plainly visible in the angles of the calyx , or entirely concealed ; 

 IBr, entirely united laterally; IBr^ short, pentagonal; IIBr series usually 

 4(3+4), more rarely 2; IIIBr series developed usually only interiorly, 2, but 

 4 (3+4) when following a IIBr 2 series ; synarthrial tubercles moderately devel- 

 oped ; rays laterally free, though sometimes very close together. 



Sixteen to twenty-two long arms, some of them arising direct from the IBr 

 axillary ; the brachials are only slightly overlapping ; the bases of the arms are 

 rugose. Brachials short ; the first is shorter than the second ; third and fourth 

 (syzygial pair) very short ; following this there is a series of discoidal brachials , 

 and then a series of wedge-shaped, the latter becoming progressively shorter, 

 and short oblong after the middle of the arm. Syzygies occur between the third 

 and fourth brachials, again somewhere between the eleventh and nineteenth 

 brachials, and distally at intervals of from seven to eleven oblique muscular 

 articulations. In the arms arising directly from a IBr axillary the second 

 syzygy is between the ninth and tenth brachials, more rarely between the six- 

 teenth and seventeenth ; the distal intersyzygial interval is usually seven or 

 eight oblique muscular articulations. 



Pj or Pd 8 mm. or 9 mm. long ; P, usually much longer, almost as long as 

 P3, 18 mm. ; P^ variable, but usually smaller ; following pinnules decreasing in 

 length to P, which is 7 mm. or 8 mm. long ; distal pinnules 14 mm. long. Proxi- 

 mal segments of the pinuules in the basal third of the arm strongly carinate : 

 the enlarged lower pinnules are moderately stiffened ; P.^ is composed of about 



