POLYPS AND CORALS. 195 



SARCODICTYON. 



A species of this genus occurs creeping over dead shells. 

 The polyps in alcohol are mostly contracted and form scat- 

 tered verrucae about a line in diameter and rather mo re in 

 height, connected by slender, fleshy stolons. 



Hong Kong, China. Dr. Wm. Stimpson. 



FAMILY, TUBIPORIDJE. 



TUBIPORA RUBEOLA? Quoy and Gay. 

 Bonin Islands. Dr. Wm. Stimpson. 



I refer to this species, with much doubt, a fragment of 

 Tubipora of very light red color, having the transverse 

 plates about .25 of an inch apart; the tubes .1 in diameter. 

 It is too imperfect to be determined satisfactorily, if, in- 

 deed, it be possible to determine species of this genus from 

 the dry corals. 



EXPLANATION OF THE PLATES. 



PLATE V. 



Figure 1. PTEROMORPHA EXPANSA Verrill ; a polyp en- 

 larged. 



Figure 2. VIRGULARIA PUSILLA Verrill; a polyp much 

 enlarged. 



Figure 3. VERETILLUM STIMPSONI Verrill ; a polyp 

 somewhat enlarged ; 3a, structure of the surface between 

 the polyps. 



Figure 4. KOPHOBELEMNON CLAVATUM Verrill ; natural 

 size, with the polyps expanded, front view; 4#, a polyp 

 much enlarged, showing outline of stomach, below which 

 are, apparently, clusters of eggs ; 46, a tentacle much 

 magnified. 



Figure 5. MURICEA SINENSIS Verrill ; a branchlet, natu- 

 ral size; 5a, one of the contracted cells magnified to show 

 the spicula. This and the next were drawn from nature 

 by Mr. E. S. Morse. 



Figure 6. MURICEA DIVARICATA Verrill; portion of a 

 branch, natural size ; 6a, a contracted cell much magnified, 

 showing spicula 



