622 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Pd is from 16 to 18 mm. long, and is composed of about 50 segments of which 

 the terminal 6-8 bear teeth. The pinnule on the IIIBr series is 12 mm. long with 45 

 segments of which the last 5-6 bear teeth. Pj is 10 mm. long with about 35 segments 

 of which 7 bear teeth. P2 is 6 mm. long with about 20 segments of which 7 bear 

 teeth, or the comb may be lacking. P3 may or may not bear a comb. Beyond P3 

 combs occur on every second or third pinnule as far as Pn. The distal pinnules are 

 8 mm. long with about 20 segments of which the first and second are short and the 

 remainder are longer than broad, and the last 4 or 5 bear dorsal hooks. The bases of 

 the pinnules are rather smooth. 



The disk is 20 mm. in diameter. The mouth is interradial, and the anal tube 

 is central. 



The color in alcohol is grayish brown. 



The specimen without locality in the British Museum has 44 arms and the cirri 

 IV, 16-17. 



Abnormal specimens. — In one of the specimens from between Fremantle and 

 Geraldton, Western Australia, one of the IIIBr series is 7 (3 + 4, 6 + 7). 



In the specimen described bj^ Dr. H. L. Clark as Comanthus caUipeplum the 

 IIIBr series "in one arm" are 3. 



In a specimen from Mer (M. C. Z., 530) with all the IIBr series 2 one of these has 

 interpolated between the 2 elements an ossicle which in dorsal view appears irregularly 

 elhptical, reaching not quite to the lateral border on either side. It seems to be 

 united to the preceding and succeeding ossicles by syzygy. 



In a specimen from Port Galera, Mindoro (M. C. Z., 667), one of the IBr axillaries 

 is divided by a suture line running from the middle of its proximal border upward 

 and to the right. The portion to the left of this line is an axillary bearing 2 perfect 

 IIBr 2 series and 4 arms. The portion to the right of the line bears an axillary which 

 to the left truncates the corner of the left-hand axillary and is supported by the entire 

 side of the IIBrj. This axillary also bears 2 perfect IIBr 2 series and 4 arms. 



Localities. — Ceylon Pearl Oyster Fisheries station XLVI; western coast of 

 Ceylon; from off Mount Lavinia northward to off Colombo, from 7 to 12 miles off 

 shore; 46-55 meters; bottom, nullipore balls {Lithothamnion fruticulosum), coral 

 fragments, and some Orbitolites sand [Chadwick, 1904; A. H. Clark, 1911, 1912]. 



Ceylon Pearl Oyster Fisheries station LXIII; Gulf of Manaar; to the west of 

 Periya Paar, going south; 31-100 meters; bottom, Orbitolites sand, some dead coral, 

 shells, and pieces of nullipore [Chadwick, 1904; A. H. Clark, 1911, 1912]. 



Ceylon Pearl Oyster Fisheries station LXIX; western coast of Ceylon; on and to 

 the east of the north end of Chilaw Paar; 15-20 meters; bottom yellow quartz sand, 

 with some coral fragments; yellow algae with oyster spat [Chadwick, 1904; A. H. 

 Clark, 1911, 1912]. 



Ceylon Pearl Oyster Fisheries station IX; Gulf of Manaar; on the southwestern 

 corner of West Cheval Paar, about 12 miles from land; 13 meters; bottom, fine quartz 

 gravel, nullipore concretions, and many dead young pearl oyster shells [Chadwick, 

 1904; A. H. Clark, 1911, 1912]. 



Ceylon Pearl Oyster Fisheries station LVII; Gulf of Manaar; outside Dutch 

 Moderagam Paar; 21-66 meters; bottom, Orbitolites sand, nulHpores, and dead corals 

 [Chadwick, 1904; A. H. Clark, 1911, 1912]. 



