l6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 60 



are narrow and rather widely separated ; the brachials are extremely- 

 short, discoidal, with produced distal edges. 



This species appears to be most closely related to A. philiberti, but 

 it is very easily distinguished from that form by the absence of carina- 

 tion on the proximal pinnules and by having the IIIBr series 2 instead 

 of4(3 + 4)- 



AMPHIMETRA CRENULATA (P. H. Carpenter) 



Antedon cremdata 1882. P. H. Carpenter, Journ. Linn. Soc. (Zool.), vol. 

 16, p. 507. 



The type of this species is a dry specimen in the Hamburg Museum 

 from the neighborhood of Borneo ; I unfortunately overlooked it 

 while at Hamburg, but from the original description there can be no 

 doubt that it is the form which has commonly been known as 

 variipinna. As this name is of the same date as variipinna, occurring 

 on the next page of the same publication, and antedates all other names 

 for the species, it is the name by which the form must henceforth be 

 known. 



AMPHIMETRA VARIIPINNA (P. H. Carpenter) 



Antedon variipinna 1882. P. H. Carpenter, Journ. Linn. Soc. (Zool.), vol. 



16, p. 506 (1). 

 Antedon brockii 1890. Hartlaub, Nachr. Ges. Gottingen, Mai, 1890, p. 183. — 



1891. Nova Acta Acad. German., vol. 58, No. 1, p. 23, pi. 1, figs. 4, 12, 



13; pi. 2, fig. 17. 



I. Canton, China; Werner. — One specimen, the type of the species ; 

 this may be described as follows : 



The centrodorsal is moderate in size with a slightly convex dorsal 

 pole 2 mm. in diameter. 



The cirri are about XX, 28-33, l 7 mrn - t0 2 ° mm - l° n & '> the longer 

 proximal segments are about as long as the distal diameter, some- 

 times very slightly longer; the outer segments are about one-third 

 broader than long; the earlier segments have slightly thickened and 

 prominent distal dorsal edges; the ninth to the twelfth (usually the 

 latter) and following develop long and sharp dorsal spines. 



The twenty-three arms were probably about 50 mm. long ; three of 

 the IIBr series are 2, and seven are 4(3 + 4) ; the three IIIBr series 

 are all 2, and all are internally developed. 



The distal edges of the third and following segments of the prox- 

 imal pinnules are strongly everted and very finely spinous instead of 

 being provided with broad lateral processes. 



The disk is completely covered with a pavement of small irregular 

 plates. 



