CLYPEASTER VIRESCENS. 39 



tridentate pedicellariae are smaller and are quite rare, as are the ophicephalous, 

 with heads about .30 mm., and the triphyllous, whose valves are only .075 mm. 

 long. 



A specimen of subdepressus in the M. C. Z. collection is the largest clypeas- 

 troid I have seen or found recorded; it is 248 mm. long and 214 mm. wide. 

 It is labelled "Lagana latissima Blainville" and is probably identical with 

 Lamarck's Scutella latissima, in which case that name is synonymous with 

 subdepressus rather than with humilis. 



Clypeaster virescens. 



Doderlein, 1885. Arch. f. Naturg., 51, 1, p. 102. 



Plates 122, fig. 15; 123, figs. 28-31; 128, fig. 8; 139, fig. 4; 140, figs. 1-2. 



This is a remarkably well characterized species which has not hitherto been 

 figured. The series of specimens collected by the Albatross ranges from 13 to 

 112 mm. in length. All have the characteristic yellow-green color, though the 

 depth of the shade differs much in different specimens. The primary spines 

 are nearly smooth, but under high magnification the marginal ones show some 

 serrations (PI. 122, fig. 15). The miliaries are mostly more or less club shaped. 

 Some of the actinal primaries, especially those near margin are 4-5 mm. long. 

 Ophicephalous and tridentate (PL 123, fig. 29) pedicellariae are abundant. The 

 former have heads .40-.50 mm. long; the blades have wide, low, curved openings 

 (PI. 123, fig. 28) while the loops are often, or of the largest valve always, more or 

 less bihamate (PI. 123, figs. 30, 31). The tridentate valves range from .25-1.00 

 mm. in length; they are rather straight and compressed and the blades meet 

 at tip for half their length. 



This species is known only from Japanese waters. The Albatross col- 

 lected it at the following places: — 



Station 4877. Eastern Channel, Korea Strait. Bott. temp. ? 59 fms. 

 Fne. gy. s., brk. sh. 



Station 4884. Between Nagasaki and Kagoshima, Japan. Bott. temp. 

 61.7°. 53 fms. Dk. gy. s., brk. sh. 



Station 4885. Between Nagasaki and Kagoshima, Japan. Bott. temp. 

 61.7°. 53 fms. Dk. gy. s., brk. sh. 



Station 4893. Southwest of Goto Islands, Japan. Bott. temp. 55.9°. 

 95-106 fathoms. Gy. s., brk. sh., p. 



