254 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Station 3970. Off French Frigate Shoal, H. I. Bott. temp.? 17-171 

 fathoms. Crs. s., sh., co. 



Station 4031. Off Diamond Head, Oahu, H. I. Bott. temp.? 27-28 

 fathoms. Fne. co. s., for., co. 



Station 4032. Off Diamond Head, Oahu, H. I. Bott. temp." 27-29 

 fathoms. Fne. co. s., for., co. 



Station 4149. Off Modu Manu, H. I. Bott. temp. 77.7°. 33-71 fathoms. 

 Co., corln. 



Station 4162. Off Modu Manu, H. I. Bott. temp.? 21-24 fathoms. Co. 



Station 4168. Off Modu Manu, H. I. Bott. temp. 78.3°. 20-21 fathoms. 

 Co. s., for. 



Bathymetrical range, 13-71 fathoms. Extremes of temperature, 74°-78.3°. 



Sixteen specimens. 



Lytechinus anamesus,^ sp. nov. 

 Plates 99, figs. 4, 5; 107, figs. 7-11. 



The largest specimen measures 25 mm. in diameter and 13 mm. high. H has 

 15 interambulacral and 19 ambulacral plates in each column. The abactinal , 

 system is 8 mm. in diameter and the actinostome is 9 mm. across. The longest 

 primary is 15 mm. long. In a specimen 11 mm. in diameter and 5 mm. high, 

 the abactinal system is 4 mm. and the actinostome 5 mm. in diameter. There 

 are 10 interambulacral and 12 ambulacral plates in each half-area. A specimen 

 17 mm. in diameter is 9 mm. high, while another, 18 mm. horizontallj' is only 8 

 mm. vertically. A specimen 18 mm. in diameter has the primary spines about 

 10 mm. long, while in another, 17 nun. in diameter they onh* measure 9 mm. 

 The smallest specimen in the series is 7 mm. in diameter and 3.5 mm. high. The 

 abactinal system measures 2.5 mm. across and the actinostome 4 mm. There 

 are in each column, 10 interambulacral and 12 ambulacral plates and the primary 

 spines are about 2 mm. long. 



The perijjroct (PI. 99, fig. 5) is large, much larger, as a rule, than a genital 

 |)late. It is covered by a number of plates (4-10 in the young, Vl 20 in adults) 

 of which one. adjoining giMiital 3, is usually nuich the largest. In adults, many 

 of the plates carry small tubercles. The genitals are of approximately equal, 

 moderate size, about as iiigh as wide, and often form a closed ring, but often 

 1 and 5 are separated and often 5 and 4 also. Each plate lias a large genital 



' di'u/utaos = intoninxliiUc. 



