32 Mr. A. II. Clark on neio Crinoids 



The cirri are VITI-XIII, 24-36 (usually 30-33), 2^ mm. 

 to 32 mm. (usually about 30 mm.) long; they are very 

 slender, and taper gradually in the proximal third, being 

 especially slender from that point onward ; all the cirrus 

 segments are approximately subequal in length, about twice 

 as long as broad at the ends, though those in the distal third 

 of the cirrus are slightly carinate, which makes them appear 

 slightly shorter, and those in the proximal half are slightly 

 longer, with slightly expanded ends ; in the outermost seg- 

 ments there is a slight indication of dorsal tubercles. 



The arms vary from ten to thirteen in number, and are 

 from 90 mm to 120 mm. long. 



Type Locality, ' Siboga ' Station No. 318 ; north-east of the 

 east eud of Java ; 88 metres. 



Family Mariametridae. 

 Selenemetra tenmcin'a, sp. n. 



This new form is closely related to S. finschil, from 

 which it differs in the structure of its cirri, which are 

 longer and more slender, and are composed of more elongated 

 segments. 



The cirri are from 55 mm. to 70 mm. long, and are com- 

 posed of 69-78 segments, of which the distal are nearly or 

 quite as long as broad, instead of twice as broad as long or 

 even broader as in S. finschn, and the more proximal ai-e 

 about twice as long as broad instead of slightly, when at all, 

 longer than broad as in S. finschii. 



Pi is 11 mm. long and is composed of twenty or twenty- 

 one segments, of which the first is short, the following 

 gradually increasing in length and becoming about as long as 

 broad on the fifth or sixth and twice as long as broad distally ; 

 P2 is 12 mm. long, with twenty-two segments, and resembles 

 P, ; P3 is 10 mm. long, with eighteen segments, and resembles 

 P2; P4 is 7*5 mm. long, with thirteen segments, and tapers 

 more in its distal portion than P3 ; P5 is 7 mm. long, with 

 thirteen segments, and is slightly more slender than P4, 

 especially distally ; the distal pinnules are 8 mm. long, with 

 seventeen segments. 



Tyj)e Locality. -Siboga' Station No. 320; north of the 

 east end of Java ; 82 metres. 



Mariametra tenuipeSj sp. n. 



The centrodorsal resembles that of the other species of the 

 genus ; the dorsal pole is slightly convex, finely tubercular, 

 1 mm. in diameter. 



