PART 5 A MONOGRAPH OF THE EXISTING CRIXOIDS 439 



less different. There has been no suggestion of a connection between this feature and 

 the geographical location. 



Regional variations. Emerging from examination of the Discovery and other 

 material, Dr. Dihvyn John found that specimens from high latitudes, such as the Ross 

 Sea, the Graham Land peninsula and Bransfield Strait, tend to have cirri with elongate 

 segments, the axillaries and second brachials also elongate and forming marked shoulders 

 with the adjacent proximal ossicles, and usually well-developed side plates and spicules 

 in the pinnules. On the other hand, specimens from farther north around South 

 Georgia have cirri with relatively shorter segments, no shoulders on the proximal arm 

 ossicles and very small, if any, side plates in the pinnules. 



The B.A.N.Z.A.R.E. specimens from Kerguelen were also found by Dr. John to 

 have cirrus segments on the short side, and the axillaries and second brachials not 

 elongated and without synarthrial tubercles. However, some of the larger specimens 

 do have strong side plates distally on the outer pinnules, though apparently lacking 

 spicules. 



Abnormal specimen. In the specimen with 10 rays and 22 arms from Aurora sta- 

 tion 1, one of the IBr! bears 2 axillaries, the usual one, which is normally developed, and 

 a second situated on its left distal border. The arms from this last are given off in 

 a plane at right angles to the plane of the other axillary that is, one exteriorly, pro- 

 truding between the left arm from the normal axillary and the right arm from 

 the next axillary to the left, and the other interiorly and not visible in a lateral view. 



Very young specimens. Gauss, 400 meters, February 15, 1903: There are 10 

 rays and 20 arms about 60 mm. long; the right posterior ambulacrum of the disk sup- 

 plies 6 arms, and the right anterior supplies 2 arms. 



Gauss, 385 meters, December 13, 1902: There are 10 rays and 20 arms 35 mm. 

 long. 



Gauss, 400 meters, February 15, 1903: There are 10 rays and 20 arms 25 mm. 

 long; on one side alternate radials are longer than those between which they are situated, 

 and bear smaller and narrower post-radial series; the longest cirri have 15 segments. 



Gauss, 385 meters, March 18, 1902: A specimen similar to the preceding with 

 10 rays and 20 arms. 



Gauss, 385 meters, December 2, 1902: There are 5 full sized rays bearing 10 

 arms 20 mm. long and, alternating with these, 5 very small radials bearing very narrow 

 division series, less than half the diameter of the other division series, followed by 

 a few brachials. 



Pentacrinoid young. A number of these are described in part 2 of this work 

 (pp. 530-557, figs. 881-937). Dr. Dilwyn John (1938) has described a pentacrinoid 

 from South Georgia which is similar to my oldest specimen but has developed a fourth 

 whorl of cirri. 



Localities. Challenger; off Kerguelen Island; 18-183 meters [P. H. Carpenter, 

 1888; A. H. Clark, 1913] (1, B.M.). Type locality. 



Challenger station 149H; off Cumberland Bay, northwestern Kerguelen; 232 

 meters; volcanic mud; January 29, 1874 [P. H. Carpenter, 1888]. 



CJiallenger station 149D; Royal Sound, eastern side of Kerguelen (lat. 4928' S., 

 long. 7013' E.); 51 meters; volcanic mud; January 20, 1874 [P. H. Carpenter, 1879, 

 1888]. 



