Clarl — Seventeen New East Indian Crinoids. 19 



is short, the second aboul twice as broad as long, the third aboul half 

 again as long as the proximal diameter, the fourth about twice as long as 

 the proximal diameter or slightly longer, the fifth about as long as the 

 fourth or slightly shorter; the following rapidly decrease in length, becom- 

 ing alter the eighth or ninth slightly broader than lung; the fifth and 

 following have a slight subterminal dorsal tubercle which gradually moves 

 anteriorly, becoming median after the ninth ; the opposing spine is very 

 small, subterminal. The earlier longer segments are slightly constricted 

 centrally with prominent ends ; the distal shorter segments are laterally 

 compressed and therefore appear broad. In general appearance the cirri 

 resemble those of Comanthus pinguis or of C. japonicus. 



The ends of the basal rays are visible as small tubercles in the angles of 

 the calyx; very narrow snbradial clefts are present; the radials are con- 

 cealed; the i Hri are concealed except in the angles of the calyx, where 

 their lateral edges diverge at an angle of 90°; the axillaries are almost 

 triangular, twice as broad as long; the lateral edges are very short, mak- 

 ing an obtuse angle with those of the i Bn. 



The ten arms are about 60 mm. long, and resemble those of C. lutkeni, 

 Imt the basal swelling is only very slightly marked. 



Pi is considerably longer and stouter than the succeeding pinnules. 



Type locality.— "Siboga" Station No. 129, reef. 



Comissia parvula sp. now 



This new species is closely related to C. hispida, but it is a smaller, 

 more delicate and more slender form ; the cirri while resembling in struc- 

 ture those of C. hispida, are arranged in two rows instead of in a single 

 row on the centrodorsal, and are more slender and more numerous. From 

 C. chadiricki, which also possesses the same type of centrodorsal and of 

 cirrus structure, it differs in having fewer cirrus segments and a smaller 

 centrodorsal on which the cirri are arranged in two rows instead of in a 

 single irregular row. . 



The centrodorsal is large, discoidal, the dorsal pole flat, 2 mm. to 2. 5 

 mm. in diameter. 



The cirri are xx-xxin, 9-13 (usually 11), 7 mm. to i) mm. long. 



The arms are 45 mm. long, and slender. 



Type locality. — East Indies; collected by the " Siboga." 



Comissia gracilipes sp. nov. 



The centrodorsal is large, discoidal, with a broad flat dorsal pole 2 nun. 

 in diameter. The cirrus sockets are arranged in a single very closely 

 crowded marginal row. 



In the type the cirri are \v, all lacking; in a smaller specimen the 

 cirri are xx, in one and a partial second row, the latter apparently 

 undergoing suppression ; there are also traces of the sockets of a third 

 row. In this latter the cirri have '.» segments and are from 4 mm. to 

 4.") mm. long; the first segment is nearly or quite twice as broad as long, 

 the second is slightly longer than broad, the third is about three times as 



