NO. 15 RECENT CRIXOIDS IN BRITISH MUSEUM CLARK 35 



DECAMETRA ALAUDJE A. H. Clark 



Dccamctra alandce 191 1. A. H. Clark, Proc. U. S. Nat. Mus., vol. 40, 

 P- 33 (1, 2). 



1. Cargados Carajos; ?o fathoms; "Sea Lark." — Two speci- 

 mens, one large and one small ; in the former the cirri are XV, 26, 

 small and slender, all the segments subequal, about twice as broad as 

 long ; the ten arms are 90 mm. long ; P x is slender and flagellate, 

 8 mm. long, with twenty-one segments which are about as long as 

 broad ; P 2 is much larger and stouter, tapering very gradually, stiff- 

 ened, 11 mm. long, with sixteen segments, of which the fifth-seventh 

 are half again as long as broad and the remainder about as long as 

 broad or broader than long ; from the fourth onward the segments 

 have projecting distal edges and distal angles, the whole pinnule 

 reminding one strongly of P, in Cenometra; P 3 is similar to P 2 but 

 smaller and much more slender and flagellate distally, 10 mm. long, 

 with nineteen segments ; P 4 and the following pinnules are slender, 

 small and weak, 6 mm. long ; the distal pinnules are very slender, 

 10 mm. long. 



2. Cargados Carajos; 50 fathoms; " Sea Lark." — One specimen ; 

 the cirri are XVII, 27-28, 14 mm. long, moderately slender ; all the 

 segments are subequal, about half again as broad as long ; a trans- 

 verse ridge begins to develop on the sixth or seventh, this becoming 

 a pair of small low tubercles on the tenth or twelfth ; the ten arms are 

 90 mm. long ; P is absent ; P x is slender, small and weak, 5 mm. 

 long, with thirteen segments ; P 2 is the largest pinnule, though it is 

 not especially enlarged ; it is slender and flagellate distally, 9 mm. 

 long, with eighteen segments, most of which are nearly twice as 

 long as broad ; the outer have slightly prominent distal edges, and 

 especially distal angles ; P 3 is intermediate between P x and P 2 ; P 4 

 and the following pinnules are small and weak ; the distal pinnules 

 are very slender, 9 mm. long. 



DECAMETRA MOLLIS (A. H. Clark) 



i. Kurrachi. — Six specimens; the cirri are XII-XV, 20-23 (usu- 

 ally 22), 10 mm. long; the dorsal processes on the outer segments 

 are very small ; the ten arms are 65 mm. long ; P x has about thirteen 

 segments and resembles P 2 , but is usually about 1 mm. shorter and 

 proportionately more slender ; P 2 is the largest, but is slender, about 

 5 mm. long ; most of its segments are about twice as long as broad, 

 or even longer ; the segments number about fourteen ; those in the 

 outer half are more or less prismatic, and have projecting outer 



