10 BULLETIN S2, UNITED STATES NATIONAL MUSEUM 



this key Asterometra is given full recognition; a new genus, Stylometra, with the geno- 

 type Antedon spinifera, is included; and the type of Ptilometra is correctly given as 

 Comaiula (instead of Aledo) macronema. 

 The eight new species described were — 



Bathycrinus equaiorialis. Antedon psyche. 



Bathycrinus caribbeus. Himerometra acuta. 



Heliometra juvenalis. Himerometra heliaster. 



Antedon serrata. Himerometra persica. 



It was at this time commonly assumed that no infrabasals existed in the recent 

 pentacrinites. Penfacrimis wyvillethomsoni had been minutely examined by the two 

 Carpenters, and no trace of such plates had been found. On the other hand, de 

 Loriol had figured small infrabasals in Isocrinus leuthardi, which is closely related to 

 several recent species. One day in the late spring of 1907, as a temporary relief 

 from the exacting detailed work involved in the intensive study of the comatulids, 

 the author decided to look into the question for himself. Dissections were made of 

 some specimens of Isocrinus decorus collected in the West Indies by the Albatross in 

 her early days and of specimens of Metacrinus rotundus and of M. superbus from the 

 1906 cruise. Infrabasals were found in all three, and during the next two days 

 figures were drawn and a short account of the discovery, together with a summary 

 of the status of infrabasals in the recent crinoids, was prepared which was imme- 

 diately submitted for publication. This paper did not appear until February 29, 

 1908, and in the meantime, in November, 1907, Doderlein's memoir on the stalked 

 crinoids of the Sibotja expedition appeared in which the infrabasals of Metacrinus 

 were described and figured. Thus the discovery of the occurrence of mfrabasals in 

 the recent pentacrinites was made independently and simultaneously by Professor 

 Doderlein and the present author. 



In this paper the following stalked crmoids are mentioned as occuring in the 

 Eastern Sea, near Kagoshima, Japan : 



Metacrinus rotundus. Metacrinus angulatus. 



Metacrinus superbus. 

 A study of the species included by Carpenter in the genus Actinometra seemed to 

 show the advisability of dividing that genus, and on February 29, 1908, a paper was 

 published in which such a division was attempted. Two genera were recognized, 

 based upon the type of articulation between the elements of the IBr and first two 

 elements of the IIBr series, Comaiula Lamarck (with the genotype Comatula Solaris 

 Lamarck) and Comaster L. Agassiz (of which the genotype is given as Comatula 

 multiradiata L&nmTck = Asterias multiradiata Linn^, 1758, and Retzius, 17S3, but not 

 Comatula multiradiata Goldfuss { = Alecto novae-guineae Mliller]). 

 The following species are assigned to Comatula: 



Comatula distinda. Comatula paucicirra. 



Comatula multibrachiata. Comatula pectinata. 



Comatula notata. Comatula serrata. 



Comatula Solaris. 



