Vernll, JVotes on Radiata. 251 



tubercle. All the otliers, except the next two, bear a similar, much 

 smaller tubercle, decreasing regularly in size to the end of the ray. 

 The two next the basal one of each ray are thinner than the rest 

 and without a tubercle. Paxilla? largest along the center of the rays, 

 presenting a crowded even surface. 



Length of ray from center 2*6 inches; radius of disk '6 ; Avidth of 

 ray at base '7 ; of median space •4. 



Aukland, New Zealand, — H. Edwards. 



No. 2. Notes 0)1 the Echinoderms of Panama and West Coast of 

 Ainerica, loith descriptions of new Genera and Species. 



The materials for this paper have been derived chiefly from the 

 collections made by Mr. F. II. Bradley, who has spent nearly a year 

 in collecting the marine animals of Panama and adjacent coasts, for 

 the Museum of Yale College, and is still engaged in that exploration. 

 I am also indebted to the Smithsonian Institution for specimens col- 

 lected at Cape St. Lucas by John Xantus, Esq., and otliers from Cen- 

 tral America sent by Capt. J. M. Dow. 



Order, OPHIUROIDEA. 



Astrophyton Panamense VerriU, sp. nov. 



The largest speciiiien in the collection is about 13 inches in total di- 

 ameter, with the disk 1 'A. The arms are irregular in their outer divis- 

 ions, some of the main trunks dividing 19 or 20 times, with very small 

 and slender terminal twigs. The entire surface above and below is 

 closely covered with rather coarse granulations, which are rounded 

 and even on the radial ribs and upper side of arms, but flattened 

 and larger on the lower side of arms, especially at the base ; on the 

 interradial membrane they are less crowded, rounded, and unequal. 

 The ten radial ribs are long and narrow (1 inch long and '\5 broad 

 at middle) much raised and prominent, strongly arched, extending to 

 the center, gradually enlarging outwardly to near the end, where 

 they suddenly expand to the end, which is truncate, leaving a trans- 

 verse cicatrix. Their upper surfaces are slightly convex and have no 

 indications of spines or tubercles, being uniformly and coarsely granu- 

 lated. The arms are rounded above, with a slight longitudinal groove 

 along the center; the joints are distinctly marked by transverse lines 

 destitute of granules ; beneath they are flat and have, also, a slight 

 central depression, and are covered with crowded, pavement-like gran- 

 ulations ; tentacle-scales two or three, quite distinct, short, spine- 

 like, commencing at the third or fourth forks ; hooks very small,, 

 visible only on the terminal twigs. Teeth about eight, strong, blunt- 



