168 HAWAIIAN AND OTHER PACIFIC ECHINI. 



.22 mm. long, besides the loop which is .05-.08 mm. more; the blade is longer 

 than in the corresponding pedicellariae of expergitus. I could find no globi- 

 ferous or rostrate pedicellariae in globulus and only one tridentate. This one 

 is very small, the valves only .15 mm. long., and might perhaps be called a triphyl- 

 lous; the blade is pointed, somewhat flattened and has finely serrate margins. 

 The color of globulus is light brown. 



This is a fine, well-characterized species, differing from expergitus in the 

 form of the test, the position of the peristome, the shape of the sternum and the 

 character of the pedicellariae. The shape of the petals is also different and 

 it is possible that the arrangement of the plates around the peristome may 

 yield an important specific character. It will be noted that this unique speci- 

 men was taken in much shallower water than any specimens of expergitus. 



Station 4832. Between Nanao and Tsuruga, Hondo, Japan. Bott. 

 temp. 53.2°. 76-79 fms. Dk. gy. s. 



Hemiaster vanus. 



Koehler, 1914. Ech. Indian Mus. Spat., p. 152. 



This is a large species of the Indian Ocean taken by the Investigator 

 three times at depths of 836-1310 fms. Only a single complete specimen is 

 known. 



Hemiaster tenuis. 



Periaster tenuis A. Agassiz, 1898. Bull. M. C. Z., 32, p. 82. 

 Hemiaster tenuis Mortensen, 1907. Ingolf Ech., pt. 2, p. 106. 



As pointed out by Mortensen, the absence of a lateroanal fasciole and the 

 distinctly ethmophract abactinal system necessitate placing this species in 

 Hemiaster. The pedicellariae have been fully discussed and figured by Morten- 

 sen. The species was known only from off Galera Point, Ecuador, in 1573- 

 1772 fms. but fragments are in the Albatross collection from the following 

 stations further south. 



The bathymetrical range is very striking. 



Station 4651. Off Aguja Point, Peru, 111 miles. Bott. temp. 35.4°. 

 2222 fms. Fne. stk. gy. m. 



Station 4653. Off Aguja Point, Peru, 17 miles. Bott. temp. 41.3°. 536 

 tins. Dk. br. vol. m. 



