PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 807 



[Notes by A.M.C] In one of the two syntj'pes in the British Museum the 

 flattened hemispherical centrodorsal is 4.3 mm. in diameter and 2.0 mm. high. There 

 were XXX cirri. Only stumps of these remain. The third segment may be only a 

 little longer than broad or twice as long as broad. The second syzygy on the arms is 

 either at brachials 10 + 11 or 11 + 12. In the first case the length of the first 10 brachials 

 is 14.0 mm. The width at 4 + 5 is 2.1 mm. P, in eacii case is on the right side of the 

 arm. All are broken but 10 segments of one measure 5 mm. The segments are all 

 short, but those of Pj after the fourth are a little longer than broad and in P3 again the 

 relative length of the outer segments increases. The fourth and fifth (sometimes also 

 the third or sixth) segments of the proximal pinnules have a distinct dorsal crest, not 

 shown in Carpenter's figure. This ends abruptly in each case, the following segment 

 being much narrower in side view. P2 has 25 segments and measures 1 1 mm. in length. 



The other syntypo has the centrodorsal 3.3 mm. by 2.2 mm., there being a slight 

 apex in the middle of the dorsal pole. There are XXVIII cirrus sockets or stumps. 

 The second syzygy is twice at 9 + 10, twice at 10+11, and once at 11 + 12 when the 

 first is at 5+6. The first 10 segments when it is at 10+ 11 together measure 12.5 mm. 

 The pinnule segments are more elongate than in the larger type. P2 again has 25 

 segments and is 11 mm. long. Its outer part is attenuate. The proximal crest is 

 again well developed. The longest detached portion of cirrus is about half of one and 

 measures 22 mm. The joints are slightly expanded unlike those of P. japonicus and 

 the segments are about four times as long as wide. 



A specimen from Siboga station 314 has the longest remaining arm measuring 

 65 mm.; when complete it was probably about 90 mm. The longest remaining cirrus 

 is broken at tlie twenty-first segment; at least three segments appear to have been lost. 

 The length is 26 mm., most of the segments being very elongated. 



The width of the arm at the first syzygy is 1.3 mm. The second syzygy is four 

 times 9 + 10, when the first nine brachials together measure 8.0 mm. in length, and 

 once at 10 + 11 when the length of the 10 segments is 8.5 mm. 



P, arises twice on the right side of the second brachial and three times on the 

 left side. Pj may bear a small gonad. P3 is larger than P2 and with longer segments. 

 None of these pinnules remains entire. 



Notes. — In 1910 I [A.H.C] examined the type specimens in London and found 

 that they resemble the larger individuals which I had previously seen from Japan and 

 from the Indian Ocean. 



Of the 238 specimens from southern Japan examined, the largest, with the arms 

 106 mm. and the cirri 50 mm. in length, were from Albatross station 5083. Stations 

 4912, 4916, 4919, 4920, 4975, and 5082 yielded medium-sized specimens, while all of 

 those from stations 4906, 4911, and 4915 were small. 



The specimen from Investigator station 114 mentioned by Messrs. Wood-Mason 

 and Alcock and subsequently studied by myself was small and much broken. 



A verj' fine specimen dredged by the Investigator at station 315 resembles in the 

 minutest details specimens dredged by the Albatross off soutliern Japan, with which 

 it was compared directly. The arms are between 100 and 110 mm. in length, and the 

 cirri are 30 mm. long, with 21 segments. Its size, therefore, is about the same as that 

 of the largest Japanese examples. An individual of the same size as, and similar to, 

 the preceding was di'edged by the Investigator at station 331. 



