40 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Station 4894. Southwest of Goto Islands, Japan. Bott. temp. ? 95 fms. 

 Gy. s.. brk. sh., p. 



Station 4895. Southwest of Goto Islands, Japan. Bott. temp.? 95 fms. 

 C ry. 8., brk. sh., p. 



Station 4937. Kagoshima Gulf, Japan. Bott. temp. 64.8°. 58 fms. M., 

 lava, p. 



Station 4948. Between Kagoshima and Kobe, Japan. Bott. temp. 62. 6°. 

 65 fms. Dk. gy. vol. s., brk. sh., p. 



Station 5071. In Suruga Gulf, Japan. Bott. temp. 70.8°. 87 fms. Char. 



of bolt.? 



Station 5095. Gulf of Tokyo, Japan. Bott. temp. 57.8°. 58 fms. Fne. 

 bl. s.j br. sh. 



Bathymetrical range, 53-106 fms. Extremes of temperature 70.8°-55.9°. 



Fourteen specimens. 



Clypeaster leptostracon. 1 



A. Agassis and Clark, 1907. Bull. M.C.Z., 50, p. _>lv 



Plates 122, figs. 8, 9; 123, figs. 17-20; 135, figs. J-.-7. 



Length 38 mm.; breadth, 31 mm.; height, 7.5 mm.; mouth sunken but 

 very little below the sides of the test. Test quite flat distal to petals, the margin 

 a trifle thicker than the test a little ways in from the margin: petaloid area 

 abruptly elevated; orally the test is flat, the region about the mouth slightly 

 concave. Tuberculation of test sparse; primary tubercles relatively large with 

 sunken areolae, less than 100 to a square centimeter of test surface aborally; 

 ridges between pore-pairs of unpaired petal with no primaries or occasionally a 

 single one; miliary tubercles fairly numerous, not crowded ami rather evenly 

 distributed. Madreporite pentagonal, 2 mm. across, the ocular plates and 

 pores fairly distinct; genital pores present only in interambulacra 2 ana 1 4, 

 close to madreporite. Unpaired petal with 24 pore-pairs on each side, 9 mm. 

 long, i).~) min. wide near tip, open by more than 3 nun.: median area •"> 3.5 mm. 

 wide; poriferous areas thus 1 nun. wide each. Anterior petals 7.5 mm. long, 

 open by only 1 mm., their greatest width. 4.7.5 num. a little further from tip 

 than in impaired petal. Posterior petals 8.5 mm. long. 5 nun. wide, open by 

 about 2 mm., their form much like that of unpaired petal. Peiiprocl 2 nun. from 

 margin, about 2 nun. aero—, covered with miliary bearing plates. 



1 XtTTTus = delicate f ;kT f )a\oi> = shell, in allusion <<> the thinness ol the test-wall. 



