A MONOGRAPH OF THE EXISTING CRINOIDS 303 



Heleromctra reynaudii A. H. CLAHK, Bull. Mus. Hist. Nat., Paris, 1911, No. 4, p. 245 (identity), 

 p. 251 (Ceylon; description of type; compared with //. joubini); Mem. Australian Mus., vol. 4, 

 1911, p. 765, footnote (recorded by Chadwick from Ceylon as Antedon variipinna); Rec. Indian 

 Mus., vol. 7, pt. 3, 1912, No. 26, p. 268 (India; ?India; descriptions of specimens); Crinoids of 

 the Indian Ocean, 1912, pp. 30, 35, 40 (identity of previous records), p. 121 (synonymy; new 

 localities; descriptions; specimens deficient in lime; parasitic Eulimas), fig. 9 (p. 122), p. 317 

 (additional locality; descriptions); Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 27 (pub- 

 lished references to specimens in the British Museum; Tuticorin; notes). H. L. CLARK, Spolia 

 Zeylanica, vol. 10, pt. 37, 1915, p. 85 (Ceylon; 55 specimens, 3 noticeably larger with longer 

 arms than the rest), p. 93 (occurs at Ceylon). A. H. CLARK, Unstalked crinoids of the Siboga- 

 Exped., 1918, p. 79 (in key; range); Journ. Linn. Soc. (Zool.), vol. 36, No. 249, May 1929, p. 

 638 (South Male). GISLEN, Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, 

 pp. 22, 27. 



Comatula (Alecto) reynaudii A. H. CLARK, Bull. Mus. Hist. Nat., Paris, 1911, No. 4, p. 245 (identity); 

 Crinoids of the Indian Ocean, 1912, p. 30 (same). 



Heterometra bengalensis A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 130 (south of Ceylon; 

 Andaman Is.; notes), p. 318 (off Gopalpore, 25-28 and 30-38 fathoms; ?India; notes), fig. 12, 

 p. 131. H. L. CLARK, Spolia Zeylanica, vol. 10, pt. 37, 1915, p. 93 (part; occurs at Ceylon). 

 A. H. CLARK, Unstalked crinoids of the Siboga-Expcd., 1918, p. 79 (part; in key; range). 



Heterometra reynaudi PELSENEER, Bull. Soc. Zool. France, vol. 53, 1928, p. 173 (parasitized by Eulima 

 [Sabinella], sp.). A. H. CLARK, Rec. Indian Mus., vol. 34, pt. 4, 1932, p. 551 (listed), p. 556 

 localities; notes). A. H. CLAHK, John Murray Exped. 1933-34, Sci. Reports, vol. 4, No. 4, 

 1936, p. 100 (range), p. 103. 



Diagnostic features.- The brachials are distinctly wedge-shaped with the ends 

 never quite parallel and are not exceedingly short. The enlarged lower pinnules are 

 smooth, with the earlier segments keeled. The cirri are 25-27 mm. long and are 

 composed of 30-47 (usually in fully grown individuals more than 40) subequal seg- 

 ments, all of which are somewhat broader than long, commonly twice as broad as 

 long, and of which the outer bear prominent sharp dorsal spines. The 14-25 (usually 

 17-20) arms are up to 110 mm. long. P 2 is the largest pinnule with 27 segments. 

 P 3 is about the size of P,, both having 29 segments. 



Description. The centrodorsal is a thick disk with a convex dorsal surface, bear- 

 ing the cirri in two alternating rows on its sloping sides. 



The cirri are XXV, 35-36, all but a few immature ones being rather more than 

 20 mm. long. All the segments are slightly broader than long, the later ones being 

 laterally compressed and bearing, from the fourteenth onward, a strong and distally 

 directed dorsal spine. The relative length of the cirrus segments varies considerably. 

 Usually all the cirrus segments are subequal, all being about twice as broad as long, 

 but sometimes they are longer, the segments in the proximal half of the cirri being in 

 extreme cases nearly as long as broad. 



The radials are entirely concealed. The IBr, are just visible above the bases of 

 the cirri and are in almost complete lateral contact. The IBr 2 (axillaries) are broadly 

 pentagonal, and are about hah" again as long as the IB^. In the specimen described 

 two of the postradial series bear two IIBr 4(3+4) series, two bear each a single 

 IIBr 4(3+4) series, and the fifth bears two IIBr 2 series. Of the eight IIBr series 

 present, therefore, six are 4(3+4) and two are 2. The first elements of the IIBr 

 series are in almost complete lateral contact, and there is a slight synarthrial tubercle 

 on the articulation between the first and second elements. 



