ART. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 7 



a. Conns manzanillai'ns'ts, new species. Resembles in a general way an 

 unpublished species from the I'.aitoa and Cercado formation, D. R., 

 but with a different type of nucleus. 



c. Tiirricula (?), species, indeterminable. In a !i"eii<?i'«il way, resembles 

 ^urcula vickshnrgensis Casey (Oligocene). 



c. DrilJia manznnillaeusis, new species. 



a. Ancilla lamellata (Guppy). 



c. Marginella guppyana, new species. 



6. (?) Alecirion brassocnsis, new species. 

 Bryozoa. 

 Microporclla, species. 



Giippy's types from jNIanzanilla not in the above list: 



Cylichnella ovum-lacerti (Guppy). 

 a. Lcda guppyi Dall {Ccrcomija Icdaeformis Guppy) afif. L. dalliana Olsson. 

 Gatun formation, Port Limon. A closely allied form occurs at Brasso 

 (9212). 



a. Lcda illecta Guppy, aff. L. Guppyi but with finer concentric sculpture. 



b. Ar-ca trinitaria Guppy. Group of A. macdonrildi Dall, Gatun. 

 6. Area filicata Guppy. Group of A. pittieri Dall, Gatun. 



«. Cardliim costiim Guppy. Badly eroded specimens. Perhaps nearer to 

 a Bowden form. 

 Dosiiiia cyclk-a Guppy. A Lucinopsis according to Dall (U.S.X.M. Proc, 

 vol. 19. p. 329, 1896). Specimen not seen. 

 a. Venus walli Guppy. (A Chione), aff. C. chipolana Dall, from Chipola 



marl member of Alum Bluff formation. 



a. Corbula vieta Guppy. Close to C. hetcrogeuea Dall. A Bowden species. 



a. Erycina tensa Guppy — probably the left valve of Corbula vieta Guppy. 



a. Mactrinula macesecns Guppy =J/rtcf/fl (Mactrotoina). Closely related to 



Mactra {Mactrotoina) cymnta Dall from the Oak Grove sand member 



of Alum Bluff formation. 



The matrix adhering to tlie specimens indicates that they came 

 from several different beds. Wall and Sawkins ^ in their detailed 

 sections — sheet 2, figure 1 — show different fossiliferous beds along 

 the coast above Manzanilla Point. I do not know the stratigraphic 

 position of the fossils listed from Manzanilla coast. Ar'ca trinitaria 

 Guppy and Area fXicata Guppy are closely related to species prob- 

 ably of middle Miocene age in Costa Rica. It appears highly prob- 

 able that some of the beds in this area are of middle Miocene age. 



UPPER MIOCENE 



List of stations 



9195. Caroni County, Couva Ward, Springvale, near Couva, Mount Pleasant 

 Road, about % to 1 mile south of Milton. J. A. BuUbrook. collector. 



9224. Caroni County, Couva Waril, Springvale, same locality as 9195 but later 

 collection. J. A. BuUbrook, collector. 



3 Report on the Geology of Trinidad. 1800. 



