A MONOGRAPH OP THE EXISTING CRINOIDS 641 



There are 24 arms, the longest 164 mm. and the shortest 65 mm. long. The 

 10 IIBr series are all 4 (3+4). The 4 IIIBr series, which are all internally developed, 

 are also 4 (3 + 4). There are II small weak cirri and some very small rudiments. 



A very slender specimen has 29 arms from 50 to 80 mm. in length. The 10 

 IIBr series are all 4 (3 + 4) and the 9 IIIBr series are also all 4 (3+4). Of the latter, 

 4 are on a single ray; 2, both internally developed, are on another; a single 1, internally 

 developed, is on each of 2 rays; and the last ray bears 1 externally developed. 



A specimen with 20 arms has the arms excessively elongated and attenuated. 

 Of the 10 IIBr series, 8 are 4 (3 + 4), and 2, both on a single ray, are 2. The cirri are 

 V, 10-11, small and weak. 



A specimen similar to the preceding has 30 arms. 



A small regenerating individual has 20 arms with 6 of the IIBr series 2 and 4 of 

 them 4 (3+4). 



The last specimen resembles the others. 



The specimen from off Neira in about 100-200 meters has 13 arms. 



Of the specimens of parvicirra recorded by Hartlaub from Amboina, all, or very 

 nearly all, appear to be in reality timorensis. At the Berlin Museum I examined one 

 which might be considered paroicirra, though it is probably timorensis. It has 28 

 arms about 100 mm. long. Six of the IIBr series are 2 and 4 are 4 (3 + 4). Of the 

 IIIBr series, 5 are 2 and 3 are 4 (3+4). Only 3 small rudimentary cirri remain. 



The specimen from Amboina collected by Professor Strubell and recorded by 

 Reichensperger has 20 arms, mostly arising through adolescent autotomy, and the 

 very weak cirri XV, 12-13. 



The specimen from the southern coast of Ceram is small, with 19 arms and no 

 functional cirri. Carpenter described it as small and immature, and noted that P D 

 and PI are relatively rather large, the latter being considerably longer than its suc- 

 cessor on the third (that is, fourth) brachial. He said, further, that the overlap of the 

 brachials is but slightly marked. 



The specimen from Siboga station 172 has 10 arms 16 mm. long. 



The example from Siboga station 234 has 19 arms 55 mm. long. There are 9 IIBr 



4 (3+4) series. 



The Challenger specimen from Ternate has 20 arms 80 mm. long. Of the 10 IIBr 

 series, 8 are 4 (3 + 4) and 2 are 2. 



The specimen from the Danish expedition to the Kei Islands station 15 is small, 

 with 18 arms, and is undergoing adolescent autotomy. Of the 8 IIBr series present, 



5 are 2 and 3 are 4 (3 + 4). One of the specimens from station 20 has 20 arms 75 nun. 

 long. Of the 10 IIBr series, 8 are 4 (3 + 4) and 2 are 2. The cirri are II, 9-10, 5 mm. 

 long. Another large specimen has about 20 arms. Of the IIBr series, 2 are 2, the 

 others being 4 (3 + 4). The centrodorsal is much reduced and is without cirri, but there 

 are 2 obsolete cirrus sockets in each interradial angle. A third specimen has 19 arms 

 65 mm. long. Of the 9 IIBr series, 5 are 4 (3 + 4) and 4 are 2. The cirri are VIII, 

 10, 4.5 mm. long. A specimen with 16 arms has one of the rays curiously abnormal 

 (see beyond). The last example has 14 arms; there are 4 IIBr 4 (3+4) series, 1 to 

 each of 4 rays. The cirri are IX, in 4 interradial pairs, the fifth interradial angle 

 having a single one. 



9729831 42 



