224 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Station 4912. Southwest of Koshika Islands, Japan. Bott. temp. 41.9°. 

 391 fms. Gy. glob. oz. 



Station 4915. Southwest of Koshika Islands, Japan. Bott. temp. 41.9°. 

 427 fms. Gy. glob, oz., brk. sh. 



Bathymetrical range, 369^27 fms. Extremes of temperature, 43.4°-41.9°. 



Eleven specimens and some fragments. 



Linopneustes excentricus. 



De Meijere, 1902. Tijd. Ned. Dierk. Vereen, (2), 8, p. 13. 



One of the cotypes of de Meijere's species is at hand, but in such a crushed 

 condition that it is difficult to compare it accurately with murrayi. It does not 

 look like the Japanese species as the test is much thinner and lighter in color. 

 Pedicellariae are few and small and are all tridentate; in none are the valves 

 .50 mm. long. I am unable to decide from such scanty material whether excen- 

 tricus is valid or not. 



Linopneustes longispinus. 



Eupatagus longispinus A. Agassiz, 1878. Bull. M. C. Z., 6, p. 191. 

 Linopneustes longispinus A. Agassiz, 1880. Bull. M. C. Z., 8, p. 82. 



Plate 146, fig. 12. 



Koehler (1914. Ech. Indian Mus. Spat., pi. 17, figs. 52-65) has recently pub- 

 lished figures of the pedicellariae of what he determines as this species. But in 

 his text he states that the specimen from which the pedicellariae were taken is 

 in his private collection and comes from the "campagne du Challenger." 

 Evidently there is some mistake here for the Challenger did not collect longi- 

 spinus. Probably Dr. Koehler intended to write "Blake." At any rate his 

 figures show well the varied forms of the triphyllous and tridentate pedicellariae, 

 the valves of which range from .10-1.50 mm. He also figures a form of rostrate 

 pedicellaria (his fig. 56) which I did not find, while I have found two forms of 

 rostrate which he does not figure. In one of these the valves may be as much 

 as two millimeters long and almost half a millimeter wide near tip: these 

 approach and probably grade into the i tout tridentate pedicellariae. The other 

 rostrate pedicellaria ifi a short, stout form, with valves (PI. 146, fig. 12) about 

 a millimeter long and of very characteristic shape. It is puzzling to understand 

 why Koehler did not find either of these conspicuous rostrate pedicellariae, if 



