NO. IO CRINOIDS OF HAMBURG MUSEUM CLARK 15 



This species is closely related to A. philiberti, but it may be easily 

 distinguished by the longer proximal cirrus segments, the longer and 

 more prominent spines on the distal cirrus segments, and by the 

 smaller number of arms. It is a considerably smaller and more 

 delicate species than A. philiberti. 



At the time I described A. schlegelii (Proc. Biol. Soc. Washington, 

 vol. 21, 1908, p. 223) I had before me two specimens, one with ten, 

 the other with thirteen arms, which were of the same size and general 

 appearance; such differences as I found I considered as probably the 

 result of individual variation. In this collection there are two speci- 

 mens, one with ten the other with twelve arms which resemble the 

 pair in the Copenhagen Museum. 



The presence of the type of A. Iccvipinna and of a large series of 

 A. philiberti (a species which I had not seen when I described A. 

 schlegelii) shows clearly that the ten armed specimen in the original 

 material and the one in the present lot are identical with Carpenter's 

 Iccvipinna, while the twelve and thirteen armed specimens represent 

 a distinct form, easily differentiated by the strong carination of the 

 pinnules, related to A. philiberti. 



The specimen which I selected as the type of schlegelii at the time 

 of the original description happened to be the one with thirteen arms. 

 Thus while the one with ten arms, originally considered as identical 

 with it, must be referred to Iccvipinna, the name schlegelii is available 

 for the thirteen armed specimen, and for the twelve armed example 

 under consideration, which represents the same form. 



Amphimetra schlegelii appears to be the northern representative of 

 A. philiberti, just as A. Icevipinna is the northern representative of 

 the discoidea group of species. 



AMPHIMETRA NEMATODON (Hartlaub) 



Anlcdon nematodon 1890. Hartlaub, Nachr. Ges. Gottingen, Mai, 1890, 

 p. 185 (1). — 1891. Nova Acta Acad. German., vol. 58, No. 1, p. 27, pi. 1, 

 fig- 9 (1). 



i. Bowen, Queensland. — One specimen, the type; there are thirty- 

 eight arms about 105 mm. long; two of the cirri still in situ have 42 

 and 43 segments of which the twelfth and following bear dorsal 

 spines; the longest cirrus segments are not quite so long as broad; 

 in the outer two-thirds, or at least one-half, of the cirri the segments 

 are twice as broad as long; the dorsal spines are rather small and 

 slender, though sharp and prominent ; the enlarged proximal pinnules 

 are comparatively slender, smooth, not carinate; the division series 



