ORECHINUS MONOLINI. 301 



long. The primary spines at the ambitus, if unbroken, often exceed the diameter 

 of the test. The form of the test is very variable, the vertical diameter ranging 

 from .45 to over .60 h. d. The distinctness of the sculpturing on both the coronal 

 plates and the abactinal system, is also very variable and in some specimens ^s 

 quite faint. The ocular plates are, without exception in these specimens, 

 excluded from the periproct, which is covered by a variable number of plates. 

 The buccal membrane is thin and very bare, for although the buccal plates are 

 large, the small plates proximal to them are few and scattered. The auricles 

 touch over the ambulacra, or nearly so, but they are not united to form an arch. 

 The color of test and spines is more or less white, very uniform, but sometimes 

 strongly tinged with brown. 



The "Albatross" took this species at the following stations: — 



Station 3839. Off Lae-o Ka Laau Light, Molokai, Hawaiian Islands. Bott. 

 temp. 46.3°. 259-266 fathoms. Lt. br. m., s. 



Station 3865. Off Mokuhooniki Islet, Pailolo Channel, H. I. Bott. temp. 

 44.8°-45°. 256-283 fathoms. Fne. vol. s., r. 



Station 3914. Off Diamond Head, Oahu, H. I. Bott. temp. ? 289-292 

 fathom.s. Gy. s., m. 



Station 3918. Off Diamond Head, Oahu, H. I. Bott. temp. 44.5°. 257- 

 294 fathoms. Wh. s., m. 



Station 4085. Off Puniawa Point, Maui, H. I. Bott. temp. ? 267-283 

 fathoms. S., sh. 



Station 4117. Off Kahuku Point, Oahu, H. I. Bott. temp. 45.6°. 253- 

 282 fathoms. Co. s., for. 



Station 4125. Off Kahuku Point, Oahu, H. I. Bott. temp. 36.4°. 963- 

 1124 fathoms. Br. m., for., r. 



Station 4126. Off Kahuku Point, Oahu, H. I. Bott. temp. 35.5°. 743- 

 1278 fathoms. Gy. s., for. 



Station 4131. Off Hanamaulu, Kauai, H. I. Bott. temp. 43.7°. 257-309 

 fathoms. Fne. gy. s. 



Bathymetrical range, 253-1278 fathoms. Extremes of temperature, 46.3°- 

 35.5°. 



Twenty-nine specimens. 



