NO. 10 CRINOIDS OF HAMBURG MUSEUM — CLARK 2J 



ing obliquely wedge-shaped, two and one-half limes as broad as long, 

 becoming less obliquely wedge-shaped di stall v. 



Pa always absent; P D n mm. to 12 mm. long with from twenty- 

 seven to twenty-nine segments of which the first four or five are 

 broader than long and the remainder about as long as broad, slightly 

 longer than broad terminally ; the pinnule is moderate in size, smooth, 

 evenly tapering and very delicate distally; P x 10 mm. long with 

 twenty-two segments, resembling P D but very slightly more slender ; 

 P 2 is 10 mm. long with twenty-five segments, resembling P l ; P 3 is 

 6 mm. long with nineteen segments, smaller and weaker than the pre- 

 ceding; the following pinnules are similar to P.; the distal pinnules 

 are 11 mm. long, slender, with twenty-nine segments which are 

 short, scarcely half again as long as broad. 



The color is light yellowish, with the dorsal pole of the centro- 

 dorsal (except for a central spot) and the articulations dark brown. 



This species differs from P. clarcc of the Moluccas in its much 

 greater number of arms (twenty-two instead of from ten to twelve), 

 in the greater number of cirrus segments, and in its longer and more 

 numerously segmented proximal pinnules. 



OLIGOMETRA SERRIPINNA (P. H. Carpenter) 



Antcdon serripinna 1S91. Hartlaub, Nova Acta Acad. German., vol. 58, 

 No. 1, p. 82 (1). 



I. Tonga Islands. — Seven specimens; one of these has the cirri 

 XXIII, 21, the segments terminally becoming nearly as long as 

 broad ; the centrodorsal is thin discoidal, the cirrus sockets, which are 

 oblong, two and one-half to three times as high as broad, arranged in 

 a single regular marginal row ; the dorsal pole is slightly concave, 

 3 mm. in diameter; P 2 is 7 mm. long with fifteen segments of which 

 the fifth is the longest, twice as long as broad ; there is a very slight 

 spinous production of the distal edges of the segments. Another 

 specimen also has 21 cirrus segments which distally are nearly as 

 long as broad; P 2 has from fifteen to eighteen segments of which the 

 basal are flattened exteriorly ; the distal edges of the third and follow- 

 ing segment are slightly produced and spinous. In a third specimen 

 the arms are about 60 mm. long ; the cirri are 15 mm. long with 20-21 

 segments ; P : has from ten to thirteen segments ; P 2 has twelve seg- 

 ments, which have no perceptible production of the distal edges. A 

 fourth specimen is interesting in possessing eleven arms, one IIBr I 

 series being present; P, has sixteen segments. The remaining three 

 are similar to those described. 



