PSEUDOBOLETIA INDIANA. 345 



specimens, and is relatively smallest in the largest. In all the specimens, the 

 depth of the gill-cuts is one fifth to one sixth the diameter of the peristome. 

 In coloration none of the specimens from Mauritius show any blotches of 

 dark color; the spines are greenish at base and more or less pinkish or light 

 rose-purple distally. The specimens from Zamboanga have the brown blotches 

 very distinct while the spines show considerable diversity in color; in one 

 specimen they are green with very decidedly rose-purple tips. In granulata, 

 there are rather indistinct, large dark blotches, the color including the base of the 

 spines. Obviously this material is not sufficient to demonstrate whether the 

 coloration furnishes a specific character in this genus or not. On the other 

 hand, the size and arrangement of the buccal plates, are constant so far as our 

 material goes, and Bell's division of maculata from indiana may be accepted at 

 least until more abundant material shows the separation to be unnatural. 

 While indiana ranges from Mauritius to the Hawaiian Islands, maculata has as 

 yet been found only in the East Indian region. Koehler's (1908, Trans. Roy. 

 Soc. Edinburgh, XLVI, p. 641) statement that the example of maculata in the 

 British Museum has no indication of locality is unaccountable; Bell (1884, Ann. 

 Mag. Nat. Hist., (5), XIII, p. 108-111) refers to several specimens and gives the 

 localities from whence they came. 



The three nominal species are distinguished from each other as follows: - 



Pore-pairs in arcs of four; actinal spines not banded. 



Buccal plates large, nearly or quite in contact; buccal membrane with many other 



rather large plates; test without dark blotches indiana. 



Buccal plates rather small, widely separated; some parts of test with bases of 

 accompanying spines, dark colored, forming more or less distinct but indefinite 



blotches maculata. 



Pore-pairs in arcs of five; actinal spines banded with green and white atlantica. 



Pseudoboletia indiana A. Ag. 



Toxopneustes indianus Michclin, 1862. Ech. et Stel.: Annexe A, in Maillard's Notes sur Bourbon, 



p. 5. 



Pseudoboletia indiana A. Agassiz, 1872. Rev. Ech., pt. 1, p. 153. 

 Psammechinus paucispinus A. Agassiz and Clark, 1907. Bull. M. C. Z., LI, p. 246. 



Plate 92, figs. 12-18. 



It has become evident on further examination of the Hawaiian material 

 that Psammechinus paucispinus is simply the youthful form of Pseudoboletia. 

 The specimens range from 12.5-19 mm. in diameter and all of them have the 



