POLYPS AND CORALS. 27 



than usual for the genus, uneven, strongly echinulated, pierced 

 by numerous rounded pores. 



Height of fragments three inches ; branches near the end 

 half an inch broad and less than a quarter of an inch thick ; 

 diameter of cells about .03 of an inch. Color dull yellowish 

 brown. 



Bonin Islands. Dr. Wm. Stimpson. 



PSAMMOCORA PARVISTELLA Verrill, nov. sp. 



Corallum consisting of clusters of short, irregular, com- 

 pressed, clavate branches, somewhat coalescent, and mostly 

 having obtuse crest-like projections near the ends. Cells 

 very small, shallow, with often a minute tubercle at the bot- 

 tom. Septa six, thick, triangular, lacerately granulous, sep- 

 arated externally only by six very narrow spaces, which 

 gradually are confounded with the porous tissue of the coe- 

 nenchyma, there being no apparent walls to the cells. The 

 surface between the cells, which are distantly scattered, is 

 evenly and densely covered by minute lacerate granulations 

 or papillae, with reticulated narrow spaces between. Color 

 of dry coral light yellowish brown. 



Height 2 inches ; length of branchlets .5 ; diameter of 

 cells about .01 ; distance between them .04. 



Loo Choo Islands. Dr. Wm. Stimpson. 



FAMILY, GEMMIPORIDJE. 



TURBINARIA SINENSIS Verrill, nov. sp. 



Corallum crateriform, growing to a large size, thick and 

 firm, attached by a short, thick peduncle. Corallites mod- 

 erately large, rather crowded, arranged somewhat in trans- 

 verse or concentric series, standing, except near the edge, al- 

 most perpendicularly to the surface, projecting but little a- 

 bove the surface of the coenenchyma, somewhat swollen at 

 base. Cells very deep with the columella very much reduced, 

 septa subequal, narrow, in three cycles, some of the third 

 wanting, except in a few larger cells where some of the fourth 

 appear. Coenenchyma between the cells loosely porous and 



