cl.\rk: brittle-stars. 267 



H. L. C. of Porto Rico, which it resembles in having six arms. I have 

 been strongly tempted to refer it to that species, but the differences 

 in the arms, arm-spines, oral shields, and mouth-parts seem to me too 

 great to be accounted for either as age differences or as individual 

 diversity. It is of course possible that both the Porto Rican and 

 Florida specimens are the young of an as yet unknown adult but in 

 the absence of specimens, it seems better not to assume that. 



AMPHIURIDAE. 



Amphiura constricta. 



Lyman, 1879. Bull. M. C. Z., 6, p. 22. 



Mr. Gabriel has sent us nine specimens from Westernport, Victoria, 

 secured by dredging in shallow water. None of these specimens is 

 quite so large as Lyman's type, which was from Port Jackson, but 

 they are not notably different in any other particular. 



Amphiura glabra. 



Lyman, 1879. Bull. M. C. Z., 6, p. 25. 



After some hesitation, I have referred to this species, an amphiuran 

 in Dr. Griffin's Philippine collection taken at Port Galera, Mindoro. 

 No depth is given but all the specimens from Mindoro were taken in 

 shallow water. Lyman's type of A. glabra was taken south of the 

 Philippines in 500 fms. and it is hard to believe that the same species 

 occurs in very shallow water. The Mindoro specimen, however, 

 differs very little from Lyman's description and figure and these 

 differences may be due to the fact that the specimen is dry. Thus 

 the disk is less than five millimeters across while the arms when un- 

 broken were at least 30 mm. long; in the type the disk was relatively 

 much bigger. The radial shields are noticeably longer and narrower 

 in the Mindoro specimen than in Lyman's figure, the disk-scaling is 

 much finer and the basal upper arm-plates are slightly different. 

 Orally there are no tangible differences. Lender the circumstances it 

 seems to me better to refer the Mindoro specimen to A. glabra than 

 to make it the type of a new species. 



