564 " THETIS " SCIENTIFIC RESULTS. 



A. Anchors wanting, etc. 



B. Phosphatic deposits present, etc. 



C. No true supporting rods, etc. 



D. Tables of body normal or often very irregular, 

 distorted or incomplete, sometimes wholly 

 wanting ; disc seldom with more than ten 

 holes (those in tail may have 20-40 holes). 



E. Tables with more or less distinct disc, 

 having 2-10 or more (usually 3-6) holes, 

 often with irregular outline and marginal 

 projections; sometimes with no spire, and 

 tlius reduced to small irregular plates with 

 2-10 perforations. 



F. Tables or plates of moderate size, SO-SSOz-t 

 in diameter, usuall^' with a single spire. 



G. Tables often wanting in skin of body, 

 present in tail; disc quite asymmetri- 

 cal ; spire of moderate height and ( OOLITICA 



ad ( 



often with teeth or branches at top... \ CONCOLOR. 



CG. Tables (or perforated '^isc-like plates) 

 present in skiu ^f body; disc rather 

 symmetrical with 3-6 or more holes; 

 spire (when present) high. 



H. Phosphatic deposits more than 60/i 

 in diameter ; tables with spires ; 

 colour not old-rose red. 



I. Discs of tables in tail not narrowed 



and drawn out into a rod at 



either end. 

 Discs of tables in tail with 6-12 



large and small holes intermedia. 



Discs of tables in tail with 20-40 



small holes dissimilis. 



II. Discs of tables in tail narrowed 



and drawn out at each end into 

 more or less of a rod. 



Discs of tables in tail with numer- 

 ous (10-30) holes, the ends 

 flattened and rough or serrate... andamanensis. 



Disc of tables in tail with few (5-10) 

 holes, the ends rounded and 



smooth PRODUCTAMEiS'SIS, 



HIT. Phosphatic deposts very minute, 

 40/i or less in diameter ; tables 

 reduced to perforated disc-like 

 plates; colour old-rose red ROSEA. 



FF. Tables very small, etc. 



