A MONOGRAPH OF THE EXISTING CRINOIDS 297 



The distal pinnules are exceedingly slender, 8 mm. long. On the large lower pinnules 

 the second-fifth segments are rather strongly carinate, this feature decreasing rather 

 rapidly distally, being soon confined to the second-fourth and then to the second- 

 third, disappearing at the end of the proximal fourth of the arm. 



The color in alcohol is brownish white, the cirri being lighter and tinged with 

 purple. 



Notes. — A second specimen has 18 arms about 90 mm. long. Six IIBr series 

 are present, of which five are 4(3+4) and one is 2. One of the IIBr 4(3+4) series 

 bears internally a IIIBr 2 series. The IIBr 2 series bears a IIIBr 4(3 + 4) series 

 externally. The color is purple. 



The third example has 13 arms 65 mm. long, the three IIBr series being 4(3+4). 

 The cirri are XVI, 32-33, 20 mm. long. The color is brownish white, the cirri light 

 purple. 



Remarks. — This species is easily distinguished from Heterornetra africana by the 

 tapering cirri which bear shorter dorsal spines, by the much more slender lower 

 pinnules, and by the longer wedge-shaped brachials. 



Locality.— Madagascar; Doctor Voeltzkow [A. H. Clark, 1911, 1912, 1918] (3, 

 U.S.N.M., 35216; Berl. M., 5348). 



History. — This species was described as Craspedometra madagascarensis in 1911, 

 and in 1912 notes were given on two additional specimens that had been collected 

 with the type. In the key to the species of the genus Heterornetra given in the report 

 on the unstalked crinoids collected by the Siboga published in 1918 this form was 

 included as a member of that genus. 



HETEROMETRA AMBOINAE (A. H. Clark) 



Plate 29, Figure 123; Plate 31, Figures 131-136 



Antedon ludovici (part) Hartlaub, Nova Acta Acad. German., vol 5S, No. 1, 1891, p. 6 (with A. 

 [Slephanometra] oxyacantha the most usual Antedon species of Amboina), p. 11 (collected by 

 Brock at Amboina), p. 15 (very common at Amboina), p. 19 (in key), p. 29 (detailed description 

 of specimens from Amboina; discussion and comparisons), p. 113 (in Gottingen Mus.), pi. 1, 

 figs. 7, 8, 11. — Koehler, Rev. Suisse Zool., vol. 3, 1895, p. 286 (Bay of Amboina). — ?D6derlein-, 

 Denkschr. med.-nat. Ges. Jena, vol. 8, pt. 5, 1898, p. 477 (Amboina). — Hamann, Bronns 

 Klassen und Ordnungen des Tier-Reichs, vol. 2, Abt. 3, 1907, pi. 12, fig. 5 (from Hartlaub). 



Craspedometra atnboinae A. H. Clark, Crinoids of the Indian Ocean, 1912, p. 35 (—Antedon ludovici 

 P. H. Carpenter, 1888, in part), p. 119 ( = .4. ludovici Hartlaub, 1891, in part; description [from 

 Hartlaub]; Amboina). — Reichensperger, Abh. Senck. naturf. Ges., vol. 35, Heft 1, p. 83 

 (Amboina; Ceylon), p. 99 (description of a specimen from Ceylon collected by Sarasin), p. 100 

 (comparisons). — A. H. Clark, Unstalked crinoids of the Siboga-Exped., 1918, p. 78, footnote 1. 



IHeterometra reynaudii (part) H. L. Clark, Spolia Zeylanica, vol. 10, pt. 37, 1915, p. 85 (3 larger 

 specimens) . 



Heterornetra amboinae A. H. Clark, Unstalked crinoids of the Siboga-Exped., 191S, p. 7S (in kc\ ; 

 range). — Gisl£n, Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, pp. 22, 23. 



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 have 28-40 (usually 30-35) 

 subequal segments all of which are about twice as broad as long. The 13-23 (usually 



208244 — 40 20 



