48 



Records of the Indian Museum. 



[Vol. XXII, 



(A, B, C, lat.sp.). In their slenderness, length and mobility they 

 resemble vibracula. In the space between these lateral spines or 

 vibracula, other spines, from one to four in number, are some- 

 times found springing from the top of the area and extending 

 stiffly downward. These are more or less inconstant being 

 apparently easily broken. 



-Satsf 



Fig. 5. — Membyanipora spinostonia, sp. nov. 

 A. Three zocEcia, X25. 



Operculum thrown widely open showing the inner 

 surface, primary mouth (pri.nio.) and chitinous 

 rim above it. X 100, 

 A magnified view of operculum and opercular spines. 

 X 100. 



B. 



C. 



Obtained at station 352, Persian Gulf, 29°2o' N., 48°47' E , 

 at a depth of 13 fathoms. 



The material upon which these observations are made is dry, 

 hence brittle and difficult to study. The upstanding spines on 

 the operculum serve to catch and hold debris, thus increasing this 

 difficulty. In Figure 5, B, showing the operculum thrown back 

 and revealing the inner surface, the primary- mouth [pri.mo.) 



