A. H. CLARK: THE CRINOIDS OF THE INDIAN OCEAN. 315 



The ten slender aims are from 30 mm. to 39 mm. long; the brachials, which 

 are proportionately long, have strongly produced and overlapping spinous distal 

 ends. 



The mouth is marginal and the anal tube subcentral ; the anal area is 

 completely covered with small thin calcareous plates. 



Locality.— Eig Tor, Gvlf of Suez, Red Sea.— Eight specimens, collected by 

 Dr. Robert Hartmeyer. 



COMATULA MICRASTER. 



Locality. — Southwest of the mouths of the Irrau-addy River; "Investigator" 

 Station 387 (15° 25' N. lat., 93° 45' E. long.); 49-40 fathoms.— One specimen 

 with arms about 45 mm. long; two cirri remain on the centrodorsal , which is 

 much reduced. 



COMASTER PARVUS. 



hoCAJjiTY .—AndaDiau Islands. — One specimen with twenty-eight arms, the 

 IIIBr series being arranged in 1, 2, 2, 1 order; one of the derivatives from a 

 IBr axillary is undivided. 



Two arms from a fully grown specimen. 



One ten-armed young, with arms 23 mm. long. 



EUDIOCRINUS GRACILIS, sp. nov. 



Description. — Centrodorsal as in E. indivisus. 



Cirri X, 15-16, 9 mm. long; first segment about three times as broad as long, 

 second about twice as broad as long, third about as long as the diameter of the 

 expanded distal end; fourth and fifth segments about twice as long as their 

 proximal diameter, the fifth slightly longer than the fourth ; the following seg- 

 ments are about as long as their distal diameter; the cirri taper gradually to 

 the fifth segment, which is a well-marked transition segment, and are more 

 delicate from that point onward ; the longer earlier segments are strongly con- 

 stricted centrally with prominent flaring distal ends; beyond the fifth the ventral 

 profile of the segments becomes straight, but the distal dorsal edge is produced 

 so tiiat the dorsal profile of the cirrus as a whole is strongly serrate; the ante- 

 penultimate segment is slightly longer than broad, without any production of 

 the distal dorsal edge ; the penultimate segment is wedge-shaped, about as long 

 as the greater (ventral) length; the opposing spine is prominent arising from 

 the entire dorsal surface of the penultimate segment, the apex terminal, the spine 

 being equal in height to about one half of the distal diameter of the segment ; 

 the terminal claw is about as long as the penultimate segment, rather stout, 

 strongly curved proximally but becoming more slender and straighter distally. 



The arms are essentially hke those of E. indivisus, and lueasui'c 55 mm. in 

 length. 



