308 HAWAIIAN AND OTHER PACIFIC ECHINI. 



except depressus; the position of the genital pores distinguishes it at once from 

 that species. It appears to be quite common among the Hawaiian Islands on 

 sandy bottoms, in moderately deep water. It apparently does not reach a 

 large size as our specimens range only from 2 to 10 mm. in diameter. 



The "Albatross" collected sculptus at the following stations : 



Station 3818. Off Diamond Head, Oahu, Hawaiian Islands. Bott. temp. 

 44.3. 293-295 fathoms. Fne. co. s., bl. sp. 



Station 4028. Off Ukula Point, Kauai, H. I. Bott. temp. 40. 444-478 

 fathoms. Gy. s., glob. 



Station 4039. Off Kawaihae Light, Hawaii, H. I. Bott. temp. 38.7. 

 670-697 fathoms. Gy. m., for. 



Station 4083. Off Puniawa Point, Maui, H. I. Bott. temp. ? 238-253 

 fathoms. Gy. s. 



Station 4086. Off Puniawa Point, Maui, H. I. Bott. temp. 44.6. 283- 

 308 fathoms. S., sh. 



Station 4087. Off Mokuhooniki Islet, Pailolo Channel, H. I. Bott. temp. 

 43.6. 306-308 fathoms. Fne. gy. s. 



Station 4088. Off Mokuhooniki Islet, Pailolo Channel, H. I. Bott. temp. 

 43.8. 297-306 fathoms. Fne. gy. s. 



Station 4115. Off Kahuku Point, Oahu, H. I. Bott. temp. 55.1. 195- 

 241 fathoms. Co. s., for. 



Bathymetrical range, 195-697 fathoms. Extremes of temperature, 55.1- 

 38.7. 



Sixty-seven specimens. 



Prionechinus Agassizii Wood-Mas, and Ale. 



Prionechinus Agassizii Wood-Mason and Alcock, 1891. Ann. Mag. Nat. Hist., (6), VIII, p. 441. 



The status of this species is uncertain. The original specimens were un- 

 usually large (13.8 mm. h. d.) for representatives of this genus and the characters 

 on which special stress was laid in the original description are probably due to 

 age; in all our largest specimens of Prionechinus the median interambulacral 

 suture tends to be sunken and the poriferous area tends to assume a zigzag 

 appearance near the actinostome. The specimens referred to this species, 

 from the "Albatross" collection are all small, 5-7 mm. in diameter, and though 

 they show much diversity in color, they agree in the position of the genital 

 pores and in the characters of the actinostome. One is pure white, another has 



