i [6 



2. Cy Home tra manca (P. 11. Carpenter 



P. II. CARPENTER. Buil. Mus. Comp. Zool., vol. 9, 1881, N" 4, p. 5 {Antedon sp.). 



■Challenger" Reports. The Comatulae, [888, p. 226, pi. 44, ligs. 2, 3 [Antedon manen,. 



Stat. 305. Mid-channel in Solor Strait, off Kampong Menanga. 113 Metres. 1 Ex. 



1'lu- dorsal pole of the centrodorsal is flat, 2 mm. in diameter. The cirri are XV, 31, 

 about 15 mm. long; the fifth-seventh segments are about as long as their (listal diameter; the 

 sixth and following have prominent paired dorsal spines which at first are widely separated 

 luit distally approach «ach other and merge into a single spine on the last two segments before 

 the penultimate. The ig arms are 60 mm. long, and are arranged on the five rays as follows: 

 3 Ü + 3)i 4(' + 3); 3 ' + 2 ); 6 ( 2 - '1 '1 2); 2; the IIIBr series are all external. 1', is 1 1 mm. 

 long, and is composed of 16 segments. 



3. Cyllometra disciforntis (P. H. Carpenter). 



As vet we are unable to state with certainty what really constitute the valid specific 

 characters in the genus Cyllometra. The number of arms is subject to so much individual 

 variation as to be of uncertain value, while the same is true of the length, number of component 

 segments and character of the enlarged proximal pinnules. At present we are inclined to regard 

 the cirri as offering the best criteria for specific differentiation, though they also are very 

 variable. But C. albopurpurea and C. gracilis may be readily distinguished from all of the 

 ether types by a glance at their cirri, and that is something gained. 



The cirri oi typical C. disciformis and typical C. manca are very different. In both 

 the dorsal spines are well developed (as compared with C. albopurpurea and C. gracilis), but 

 in t". disciformis they are much lon^er than in C. manca, while furthermore the earlier cirrus 

 nents are elongated, twice as long as broad instead of only very slightly, if at all, longer 

 than broad. However, in deep and cold water as a rule the elongated earlier cirrus segments 

 of C. disciformis rapidly shorten, so that the character of the cirri approaches that of typical 

 C. manca. 



I have before me 56 specimens which I have referred to C. disciformis. all from the 

 Philippine Islands 



I 1 t of Masbate, 80 fathoms ("Albatross" Stat. 5213; Cat. X" 35314 U.S. Nat. Mus.); 

 ;- Ex. < 't these the largest have arms 95 mm. long; ten have 11 arms, eight have 12 arms, 

 six have 13 arms. tour have 14 arms, three have 15 arms, two have 16 arms, three have 

 17 arms. two have tg arms, and four have 20 arms; one is badly broken, and there are two 

 ten-armed young. 



Easl of Masbate, 80 fathoms ("Albatross" Stat. 52 13; Cat. X" 36(137 U.S. Nat. Mus); 1 Ex. 



1 a i of Masbate, 10S fathoms ("Albatross" Stat. 3212; Cat. X" 35348 U.S. Nat. Mus.); 

 Ex. These have [6, |S and 20 arms. 



North Balabac Strait, 58 fathoms ("Albatross" Stat. 5356; Cat. X" 35280 U.S. Nat. 

 Mus.); 1 1 



