ECHINOLAMPAS CHUNI. 113 



Tuberculation of test close and fine; median area of II and IV with 9-14 

 vertical series of tubercles. 



Test elevated (v. d. = .52-.67 h. d.); poriferous areas of I and V 



markedly unequal, the outer longer ovala. 



Test depressed (v. d. = .47-53 h. d.) ; poriferous areas of I and V 



more or less equal or the inner longer richardi. 



Tuberculation coarser; median area of II and IV with only 4-8 vertical 



series of primary tubercles alexandri. 



Ambulacra narrow, little or not at all petaloid; inner poriferous areas of I and V 

 about half as long as outer or even less. 



Pore-pairs vertically closer than the pores of a pair are to each other hori- 

 zontally; tuberculation rather fine (unpaired petal having left-hand 

 poriferous area 10 mm. long, includes about 30 primary tubercles) . . depressa. 

 Pore-pairs vertically farther apart than pores of a pair are horizontally; 

 tuberculation coarser (unpaired petal having left-hand poriferous area 

 10 mm. long, includes only about 15 primary tubercles sternopetala. 



Echinolampas crassa. 



Palaeolampas crassa Bell, 1880. Proc. Zool. Soc. London, p. 43. 

 Plate 144, fig. 17. 



Examination of one of Bell's cotypes, reveals only tridentate pedicellariae, 

 but they are common. The valves (PL 144, fig. 17) are intermediate in form 

 between those of alexandri and depressa, and range in length from .22 to .45 mm. 



Echinolampas sumatrana. 



Palaeolampas sumatrana Doderlein, 1905. Zool. Anz., 28, p. 624. 



This species is known from only a single, imperfect bare test taken by 

 the Valdivia in Siberut Strait, Sumatra, in 206 fms. 



Echinolampas chuni. 



Palaeolampas chuni Doderlein, 1905. Zool. Anz., 28, p. 624. 



This species is known from only two bare tests taken by the Valdivia 

 at the same time and place with the preceding species. 



