BARBADOS-ANTIGUA REPORTS 115 



collection. Both the "Hassler" and the "Blake" took Geno- 

 cidaris off Barbados, but in each case three specimens taken to- 

 gether was the total capture, so it is obviously not common in 

 that region. One of the bare tests of the present collection is 7 

 mm. in diameter but the other is only 3.5. 



Station 84. June 6, 1918. Spring Garden bears E. N. E., 

 Needham Point Light, S. E. Off shore 11/2 miles, 100 

 fms. Fine, sandy bottom. Dredge. 2 specimens. 



PSEDDOBOLETIA OCCIDENTALIS, Sp. UOV. 



Plate II, figs. 1 and 2 



Test 54 mm. in diameter, 27 mm. high, only a little concave 

 orally and rather flat abactinally. Coronal plates 25 in each 

 interambulacral column and 30 in the ambulacra; the inter- 

 ambulacra are about 19 mm. wide at ambitus and the ambulacra 

 about 14. Each interambulacral plate in the midzone has 4 

 large primary tubercles, the outermost is slightly the largest, the 

 innermost is smallest; a large secondary' tubercle occupies the 

 outer end of the plate, encroaching on the ambulacra ; there are 

 8-10 much smaller secondary tubercles, chiefly along upper mar- 

 gin of plate, and about a dozen irregularly scattered miliaries; 

 orally the number of primary tubercles becomes reduced to 3 

 and then to 2 and on the lowest plate to one; the gill slits are 

 very deep, reaching up between the tubercles of the third plate 

 (from the peristome) ; aboralh' there are 4 primaries to the 

 tenth plate (from the genital), 3 to the seventh and 2 to the 

 fourth or fifth. Each ambulacral plate in the midzone has 2 

 primary tubercles and a secondary tubercle at each end ; the 

 outer secondary encroaches much on the poriferous area ; it is 

 wanting only on the lowest two plates and on the uppermost 

 three or four; the inner secondary occurs only in the midzone; 

 the inner primary occurs first on about the twelfth plate from 

 the ocular. Pore-pairs in strongly curved arcs of four, the low- 

 est distinctly nearer the ambulacral mid-line than the upper- 

 most. 



Abactinal system small, only 9 mm. across, the periproct only 

 4 mm. ; oculars I and V broadly insert, the others not nearly so ; 



