Tlie Barrettia Beds of Jamaica. 513 



Localitij. — Barrettia bed, Green Island, Jamaica. One specimen. 

 Noetling records his species from the Des Valley, in Baluchistan, 

 and he thinks that d'Archiac's specimen from Sind is also from Upper 

 Cretaceous beds. 



Avellana {Eriptycha ?) cf. decurtata Zekeli. PI. XX, Fig. 5. 

 1852. " Gastropoden der Gosaugebilde " : Abhandl. der Kais. Koen. Geol. 

 Reichsanstalt., Bd. i, Abt. ii, No. 2, p. 45, pi. viii, figs. 1, 3. 



An Avellanoid gastropod occurs on the same piece of rock as the 

 Cardita just described. The aperture is embedded in the matrix, 

 so one cannot be sure to which of the Cinulid genera it should be 

 referred. The spire is low and rounded, though it seems to project 

 rather more than is the case with the Gosau form, and the 

 Jamaica shell is altogether larger. The Gosau species is ornamented 

 on the last whorl with twenty to twenty-five fine spiral lines, while 

 the Jamaica form has only about twenty. 



Dimensions. — Length 12 mm., diameter of body whorl 12 mm. 



Locality. — Barrettia bed, Green Island. One specimen. 



Lima {Limatida 1) sp. 

 A small Lima, having the general elongate outline of L. gibhosa 

 Sow., occurs also on the same rock fragment as the two foregoing 

 fossils. It is a left valve, 20 mm. high and 17 mm. wide, with about 

 eighteen smooth rounded ribs radiating from the beak. 



EcJdnoidea. 



1 collected at least four genera of echinoids both in and just below 

 the Rudist limestones in Jamaica. These are at present in the hands 

 of two skilful experts on these organisms. Dr. F. A. Bather, F.R.S., 

 and Professor H. L. Hawkins, F.G.S., whose considered opinion 

 on these fossils will be of great value in the estimation of the horizon 

 of the Jamaican Rudist beds. The preliminary examination of 

 these seems to lend support to the view that the limestones are of 

 exceptionally late Cretaceous age. 



The single echinoid from the Barrettia bed of Green Island is 

 said to have all the features of Lanieria, without any of the essential 

 structure of that genus. It cannot at present be placed in any known 

 genus. 



EXPLANATION OF PLATES. 

 Plate XVIII. 

 Fig. 1. — Barrettia cf. multilirata ; Whitfield ; -var. conica nov. Upper 

 Cretaceous. Haughton Hall, near Green Island, Western Jamaica. 

 Specimen with upper valve in place. One-half natural size. la. View 

 of top valve. \b. Side view of both valves conjoined. Author's collec- 

 tion. 



Plate XIX. 

 Fig. 1. — Barrettia cf. multilirata; Whitfield; typical form(?). Upper 

 Cretaceous. Haughton HaU, near Green Island, Western Jamaica. 

 Specimen with upper valve in place, the upper valve partly crushed into 

 the visceral cavity. Above the centre of the top valve are seen the two 

 VOL. L,IX. — NO. XI. 33 



