Verrill, Notes on Radiata. 253 



slender and relatively longer, and extend nearly to the end of the 

 mouth-slits. The madreporic plate is very small and inconspicuous. 

 The hooks of the arms are more conspicuous and numerous. 



Another, much younger specimen, measures from the center to edge 

 of interradial space, '05 inch; to end of radial ribs •! ; to first fork of 

 arms 'IS. The arms divide four times and are long and slender, with 

 numerous hooks ; the tentacle-scales extend as far inward as the first 

 fork. The radial ribs do not reach the center, where there is a small, 

 much depressed space ; they have the form of five very prominent ob- 

 long lobes with a shallow dividing line along the top of each. The 

 whole upper surface is covered with coarse rounded granulations, 

 which are arranged in transverse lines on the arms. 



Color of dried specimens, yellowish brown, with traces of lighter 

 bands on the arms. 



Panama and Pearl Islands, adhering to MuricecB, — F. H. Bradley.* 



Six specimens of this species, of various sizes, are in the collection. 



It appears to be most nearly allied to A. Caryl Lyman, of San 

 Francisco, Cal. 



Oph-iura teres Lyman, Catalogue Museum Comp. Zool., I, p. 37, 1865. 



This large species is common at Panama and the Pearl Islands, at 

 extreme low-water under stones. About 25 specimens are in the col- 

 lections of jNIr. Bradley. 



Some of the larger specimens have rays 5 inches long, with the disk 

 1"4 in diameter. It is readily distinguished by its stout, round arms, 

 with mucli broken upper arm-plates. The color is dark olive or pur- 

 plish brown above, the arm-plates, and sometimes the disk, is thickly 

 speckled with grayish white. Lower side of arms and chewing appa- 

 ratus light yellowish brown, in life lemon-yellow. 



Ophiura Panamensis (LUtken) LTman, op. dt., p. 32. 



Ophioderma pana7nensis Ltk., Additamenta, hist. Opli.. p. 91, 1859. 



This species is, apparently, more common than the preceding. Mr. 

 Bradley has sent numerous specimens from Panama. It also occurs at 

 Acapulco (Mus. Comp. Zooh), and Cape St. Lucas (Smiths. Inst.). 



The larger specimens have arms 4*25 inches long ; disk '9 in diameter. 



The color is dark greenish gray or brownish above, sometimes with 

 a central light spot; arms similar in color, banded with lighter and 

 darker. Lower surface grayish or greenish wliite. Mouth-shields 

 rounded, broad-oval ; side m^outh-shields granulated. 



This species is closely allied to 0. teres. It may be distinguished by 

 its longer, less convex, and more slender arms ; by the upper arm-plates, 



* Since received from Zorritos, Peru, and Gulf of California, at La Paz, — Reprint. 



