A MONOGRAPH OF THE EXISTINQ CRINOIDS 



799 



3 mm 



Figure 50. — Ptntamilrocrinus japonicus (P. H. 

 Carpenter): a, Syntype; b, U.S.N.M., 35924, 

 Albatross station 4900, tip of large cirrus; c, tip 

 of peripheral cirrus of small specimen, arm width 

 at first syzygy 0.8 mm.; d, Pj. 



3mm 



Pentametrocrinus japonicus can be distinguished at a glance from P. varians, with 

 which it is frequently associated, by its more robust and massive appearance. In 

 color the two are practically identical. 



Abnormal specimen.— la one of the arms of one of the 2 examples dredged by the 

 Siboga at station 211 the first brachial is repeated as a smaU ossicle about half the size 

 of the normal first brachial and of about half its width, which is inserted between the 

 normal first brachial and the second brachial. The articulation between the normal 

 and the supernumerary first brachials aud that between the latter and the second 

 are both synarthrics. 



Parasitism [by A.M.C.]. — The small specimens from Albatross station 4900 (U.S. 

 N.M., 35924) are all infected by gall-producing parasites which appear to have 

 induced a marked hypertrophy of the infected arms. These arms are both longer and 

 thicker than the arms which do not bear the galls. 



Localities. — Albatross station 5661 ; Flores Sea; Cape Lassa bearing N. 21° E., 12.5 

 miles distant (lat. 5°49'40" S., long. 120°24'30" E.); 329 meters; temperature 10.28" 

 C; hard bottom; December 20, 1909 (1, U.S.N.M., 36006). 



St6o(7a station 38 ;Sunda Sea, north of Sumbava Gat. 7°35'24" S., long. 117°2S'3G" 

 E.); 521 meters; coral; April 1, 1899 [A. H. Clark, 1918] (1, Amsterdam jM.). 



