344 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Station 3960. Off Laysan Island, H. I. Bott. temp. 74° ? 10-19 fathoms. 

 S., sh., CO. 



Station 3968. French Frigate Shoal, H. I. Bott. temp. ? 14^-16§ fathoms. 

 Crs. s., CO. 



Station 3969. French Frigate Shoal, H. I. Bott. temp. ? 15-16 fathoms. 

 Crs. s., sh., CO. 



Station 3970. French Frigate Shoal, H. I. Bott. temp. ? 17-17^ fathoms. 

 Crs. s., sh., CO. 



Station 3975. Off Necker Island Shoal, H. I. Bott. temp. ? 16-171 fath- 

 oms. Crs. s., CO., sh. 



Station 4147. Off Modu Manu, H. I. Bott. temp. 77.9°. 26 fathoms. 

 Co., corln. 



Bathymetrical range, 10-26 (171 ?) fathoms. Extremes of temperature, 

 77.9°-74° ? Twenty specimens. 



PSEUDOBOLETIA. 



Trcschel, 1869. Sitzungsb. Niederrh. Gesel. Bonn, p. 96. 

 Type-species, Pseudobolelia slenostoma Troschel, 1. c. = Toxopneustes indianus Michelin, 1862. Ech. et 



Stcl.: Ann6xe A, in Maillard's Notes sur Bourbon, p. 5. 



The question as to the number of valid species in this interesting genus is 

 still open in spite of the writings of de Loriol, Bell, Mortensen, de Meijere, and 

 Kcehler. It cannot be doubted that Koehler's species from the Atlantic Ocean, 

 and which he called maculata, is really quite a new species and the name ailantica 

 is suggested for it. Neither is there any good reason to question that the species 

 so well described by de Loriol as Indiana is really that species, and the type of 

 (jranulala A. Ag. seems to be only a very large specimen (93 mm. h. d.) of the 

 same. But whether the species called by Troschel, muculata, is really entitled 

 to recognition seems doubtful. There are in the M. C. Z. collection, besides 

 the type of granulata, three specimens of indiaun from Mauritius, three speci- 

 mens of the "Challenger" species from Zamboanga. which Bell and Mortensen 

 call maculala, and a small bare test from an unknown locality. These speci- 

 mens seem to prove that the size of the i)enstomc and the depth of the gill-cuts 

 do not furnish reliable specific characters and throw doubt on the value of the 

 coloration as a means of separating the two species. In the type-specimen of 

 granulata, \\\v test is 3.2 times the diameter of the peristome, while in the 

 other specimens it ranges from 2.2 in the smallest, to 2.5 in the next to the 

 largest. As in all regular Echini, the peristome is relatively larger in young 



