338 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



India). H. L. CLAEK, Spolia Zeylanica, vol. 10, pt. 37, 1915, p. 85 (Ceylon; detailed descrip- 

 tion of a specimen), p. 93 (occurs at Ceylon). A. H. CLARK, Unstalked crinoids of the Siboga- 

 Exped., 1918, p. 131 (in key; range). GJSLN, Ark. Zool., vol. 19, No. 32, 1928, p. 6, No. 22 

 (notes on specimens in the B. M.). A. H. CLARK, Rec. Indian Mus., vol. 34, pt. 4, 1S32, p. 

 551 (listed), p. 560 (Neendakara Bar; notes), p. 564 (range); John Murray Exped. 1933-24, 

 Sci. Reports, vol. 4, No. 4, 1936, p. 105. GISL&N, Kungl. Svenska Vet.-Akad. Handl., ser. 3, 

 vol. 17, No. 2, 1938, p. 17 (discussion). 



Diagnostic features. The carination of the arms is continued to the tips and 

 varies from slight to well marked; the cirri are XVI-XXXVTII (averaging XXV), 

 20-26 (usually 20-22), from 15 to 22 (averaging 18) mm. long; the proximal pinnules 

 are often more or less stiffened, but are not spine-tipped. 



This form is very close to true carinata, but as a rule there is no difficulty in 

 identifying specimens. It is closer to carinata than it is to the geographically nearer 

 clarki. 



Notes. In the specimen from the Neendakara Bar the centrodorsal is thick 

 discoidal with the broad flat dorsal pole about 5 mm. in diameter. The cirri are 

 XXXVIII, 22-25, about 20 mm. long. The cirrus segments are subequal, usually 

 about twice as broad as long, those in the outer third of the cirri being usually very 

 slightly broader than those in the proximal half. The arms are about 100 mm. long. 

 The carination of the brachials is slight, but when the specimen is dry it is easily made 

 out in the proximal half of the arms. In the distal half of the arms it gradually 

 becomes more and more obscure, and in the terminal fourth of the arms there may 

 be no trace of carination, the brachials having an evenly rounded dorsal surface and 

 slightly produced and finely spinous distal ends. 



The 17 specimens from Galle, Ceylon, are all small or of medium size. 



In a lot of 14 specimens from Ceylon in the British Museum the cirri are XXVI- 

 XXIX, 23-26 (usually 25), 21 or 22 mm. long. The outer cirrus segments are about 

 twice as broad as long as in T. carinata. The last four segments taper rather rapidly. 

 The cirri are rather slender and weak, but very numerous, giving the animal a very 

 characteristic appearance. They are arranged very irregularly, approximately in two 

 and a partial third rows on the centrodorsal. The proximal pinnules are stiffened. 



Eleven specimens from Ceylon studied by Dr. August Reichensperger showed 

 the following characters: 



1. The cirri are XXV, 20, 17 mm. long. The arms are 75 mm. long. The 

 carination of the brachials is slight. The pinnules are slightly stiffened. 



2. The cirri are XXI, 20, 16 mm. long. The arms are 70 mm. long. The cari- 

 nation of the brachials is slight. The pinnules are stiffer than in the preceding 

 specimen. 



3. The cirri are XXIV, 21, 18 mm. long. The arms are 80 mm. long. The 

 carination of the brachials is medium. The pinnules are stiffer than in the first. 



4. The cirri are XX, 22, 17 mm. long. The arms are 85 mm. long. The cari- 

 nation of the brachials is medium. The pinnules are stiff. 



5. The cirri are XVI, 20, 15 mm. long. The arms are 85 mm. long. The cari- 

 nation of the brachials is strong. The pinnules are stiff. 



6. The cirri are XXX, 22, 20 mm. long. The arms are 100 mm. long. The 

 carination of the brachials is strong. The pinnules are moderately stiff. 



