A MONOGRAPH OF THE EXISTING CRINOIDS 285 



as long as broad terminally. The pinnule is about as stout basally as P,, but it 

 tapers very gradually and regularly distally and hence appears much stouter. A 

 ridge runs the entire length of the outer side of the pinnule and the first 10 segments 

 bear prominent carinate processes which from the seventh outward decrease slowly 

 in height. P 3 is 19 mm. long, with 27 segments. It resembles P 2 and is of about the 

 same width basally, but it tapers less rapidly, especially in the distal half, so that it 

 appears stouter. The carinate processes on the earlier segments are slightly smaller 

 than those on P 2 . P 4 is 13 mm. long, with 25 segments. It is slightly less stout 

 basally than P 3 and tapers gradually, becoming very slender in the terminal third. 

 The earlier segments are about twice as broad as long, those following becoming about 

 as long as broad on the eleventh and twice as long as broad terminally. As in P 2 

 the lateral ridge is conspicuous and is more or less tuberculated. The second-seventh 

 segments bear narrow, though very prominent, carinate processes. P 5 is 10 mm. 

 long, with 22 segments, and is much smaller and more slender than the preceding 

 pinnules. The carinate processes on the second-seventh segments are rather more 

 conspicuous than they are on the preceding pinnules, causing the pinnule to appear 

 rather disproportionately broad in the basal half. The succeeding pinnules are 

 similar, the next three or four slowly decreasing in size. 



Locality. — Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 66; 

 off western Java (lat. 5°54' S., long. 106°12' E.); 24 meters; sand and shells; July 27, 

 1922 (1, C. M.). 



Remarks. — This species seems to approach Craspedometra in the marked terminal 

 taper of the cirri. It is almost intermediate between Craspedometra acuticirra and 

 such species of Heterometra as H. amboinae. 



HETEROMETRA AFFINIS (Harllaub) 



Anlcdon affinis Hartlatb, Nachr. Ges. Gdttingen, May 1890, p. 184 (description; Amboina); 

 Nova Acta Acad. German., vol. 58, No. 1, 1891, p. 11 (collected by Brock at Amboina), p. IS 

 (in key), p. 25 (detailed description and comparisons; Amboina), p. 113 (in Gottingen Mus.), 

 pi. 1, fig. 14, pi. 2, figs. 18, 24. — Hamann, Bronns Klassen und Ordnungen des Tier-Reichs, 

 vol. 2, Abt. 3, 1907, p. 1582 (listed).— A. H. Clark, Crinoids of the Indian Ocean, 1912, p. 37 

 (identity) . 



Himerometra affinis A. H. Clark, Smithsonian Misc. Coll., vol. 50, 1907, p. 356 (listed). 



Heterometra affinis A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 11 (listed); Crinoids 

 of the Indian Ocean, 1912, p. 37 (identity), p. 127 (synonymy; habitat); Unstalked crinoids of 

 the Siboga-Exped., 1918, p. 79 (in key; range), p. 82 (station 99; notes), p. 272 (listed). — 

 Gisl£n, Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, p. 22. 



Diagnostic features. — The enlarged proximal pinnules are smooth with the earlier 

 segments carinate, and P 2 is the largest and longest. The longest cirri have not more 

 than 30 segments of which a few are slightly longer than broad and the outermost 

 bear small dorsal spines. The 15-18 arms are 65-120 mm. long and are composed of 

 wedge-shaped brachials. 



Description. — The centrodorsal is a rather small disk with the cirri arranged in 

 two irregular rows. The cirri are not confined to the margin but leave only a rather 

 small irregular central portion of the dorsal surface bare. 



The cirri are about XXIV, 20-30, the longest 20 mm. long. A few of the segments 

 are slightly longer than broad. The distal segments are strongly compressed laterally 



