﻿xii process-blocks and other illustrative figures. 



Page 



Fig. 1. Longitudinal section of Oriomstraa placenta 283 



2. Group of corallites of Lithostrotion martini 28.'3 



3. Distal surface of Aulina rotiformis 291 



4. Diagram combining a transverse and a longitudinal section of 



Aulina rotiformis. 292 



Dates of Issue of the Quarterly Journal for 1916. 



No. 285 -May 8th, 1917. 

 No. 286— September 10th, 1917. 

 No. 287— November 23rd 1917. 

 No. 288— December 31st, 1917. 



