Mr. G. Lewis on the Pyrochroidsa of Japan. 165 



but differ in the absence of a distinct dermal reticulation of 

 foreign bodies, such as is described and figured for that 

 species, although irregularly scattered foreign bodies are fairly 

 abundant in the skin. Dr. von Lendenfeld informs me that 

 he now believes his Euspongia canaliculata to belong to the 

 genus Hippospongia. At the time when he wrote his descrip- 

 tion of it he believed it to be identical in part with Mr. Carter^s 

 Euspongia anfractuosa, notwithstanding which he gave it a 

 new name of his own, citing Euspongia anfractuosa as a 

 synonym. Doubtless in his forthcoming monograph of the 

 horny sponges this most perplexing question will be further 

 elucidated. 



EXPLANATION OF THE PLATES. 



Plate IX, 



Fig. 1. Suherites inconstans, var. glohosa, x\. 



Fig. 1 a. The same ; tylostylus, X 190. 



Fig. 2. Suherites inconstant, var. digitata, x |. 



Plate X. 



Fig. 1. Suherites inconstans^ var. mceandrina, X |. 

 Fig. 1 a. The same ; portion of upper surface, nat. size. 



Plate XL 



Fig. 1. Axinella Donnani, X f . 

 Fig. 2. Phakellia Ridleyi, nat. size. 

 Fig. 2 a. The same ; stylus, X 284. 



Plate XII. 



Fig. 1. Raspailia Thurstoni, X f. 



Fig. 1 a. The same ; three of the spined styli, X 284. 



Fig. 1 b. The same ; smooth stylus, x 284. 



Fig. 2. Itaspailia fruticosa, X f. 



Fig. 2 a. The same ; very long, slender stylus, X 284. 



XVII. — On the Pyrochroidse of Japan. 

 By Geoege Lewis, F.L.S. 



The collection made in Japan in 1880 and 1881 contains 

 twelve species of Pyrochroidse, and there is a certain simili- 

 tude between them and those known from the United States ; 

 this will be seen best from the following table, which 

 gives the genera and number of species of both countries : — 



