5o 

 Group I. THE RAPHID^. 

 i. Area limited by a distinct line insidj the termination of the 



— Area not limited by a distinct line (19). 



—Area terminating in subulate beaks reaching marg 



( '. birostratus^ 1 )ehy. 

 — Area not ending in beak-like terminations 



. e bearing minute apiculi. C. circu \ S. 



—Striae without apiculi, sm > »th or p met 1 

 — Striae smooth, continuous (9). 

 — Striae punctate (15;. 



— Striae more numerous than Rays. C. Samoensis* Grun. 

 — Striae in equal number to Rays (1 1). 



— Area panduriform, punctate, C. panduriger y A. S. 



— Area not panduriform (13). 



■Inter-Striae punctate, sub-moniliform. C. Afacassarensis 

 (Grove), Deby. 



14 — Inter-Striae smooth, or apparently so (49). 



15. — Raphe, with blunt, thick, projecting angular apices. Striae 

 with scattered granules. C. imperialism A. S, 



16. — Raphe not ending in blunt, prominent, thickened ends (17). 



17. — Disc, with a trapezoidal inserted line, with acute angles and 

 rounded sides. C. trapczoidalis. Deby. 



18. — Disc, without a trapezoidal inscribed line. 



C. Hodgsoni x W. Sm. 



Including C. incertus, A. S. 



