•592 DR. A. MORLEV DAYIES 0>" THE FATJXAS [vol. lxxix, 



to 12 mm. in diameter). It is interesting to note that a single 

 specimen of what seems to be Martin's species "was found attached 

 to a Clypeaster depressus (Brit. Mus. E 16588) at Minihagal- 

 kanda, where O. malabarica does not occur. 



The type-locality of this species having been more than once 

 incorrectly given, it is restated hereon the authority of the Annual 

 Keport of the Geological Survey of India for 1883 (Pec. Or. S. 

 India, vol. xvii, p. 9). 



Age. — Miocene (Vindobonian or later). 



Type-locality. — Purappakkara, about 7 miles north-west of 

 Quilon, Travancore (at a depth of 40 feet, under laterite). 



Ceylon localities : Kirimalai and near Pallai, Jaffna peninsula ; 

 north of Pomparippu (North - Western Province) ; Puttalam 

 (North- Western Province). 



Clypeaster sp., aff. carteri Duncan & Sladen. (PL XXLX, 

 rigs. 1 & 2.) 



18S3. Clypeaster carteri P. M. Duncan & W. P. Sladen, ' Tertiary Fossil 

 E chine-idea of Kachh & Kattywar ' Palteontologia Indica, ser. 7 

 & 14, vol. i, pt. 4, p. 49 & pi. xii, fig. 12. 



Compare also : — ■ 



1840. Clypeaster oblongus J. de C. So-werby, in Grant, Trans. Geol. Soc. 

 ser. 2, vol. v, pt. 2, p. 327 & pi. xxiv, figs. 25-25 a. 



The Ceylon species differs from O. carteri (1) in outline, (2) in 

 the details of the pore-fields. 



(1) The postero-lateral margins are much more oblique, bring- 

 ing the postero-lateral angles on a level with the posterior end of 

 the petals, instead of well behind them. 



(2) The costae carry a few small tubercles, instead of only 

 granules ; and in the odd ambulacrum the pore-fields are not quite 

 as broad as the inter-poriferous area. 



It is probable that there are other small differences, but they 

 cannot be definitely stated from the description and solitary figure 

 of C. carteri. The Ceylon specimen is perfect, and shows a typical 

 clypeastroid apex, with central madreporite and five genital 

 pores. 



The type of C. oblongus Sowerby is a broken specimen. So far 

 as can be determined, its proportions are very much the same as 

 those of the Ceylon specimen, and it diverges even more than the 

 latter from O. carteri in respect of its cost*, which have often five 

 tubercles, while those of the Ceylon specimen rarely have as many 

 as four. 



According to the account given by Duncan & Sladen, G. carteri 

 should be Oligocene, but Yredenburg has warned us as to the 

 confusion of horizons by those authors. 



Age. — Miocene (Vindobonian). 



Locality. — Minihagalkanda, Southern Province (Ceylon). 



