ART. 22 MIOCENE GASTBOPODS AND SCAPHOPODS MANSFIELD 35 



emargination ; the upper margin of the posterior plication marks 

 the lower boundary of the imcalloiised area; a spiral stria is near 

 the lower part of the imcalloused area. Anterior canal short, wide, 

 roimded, and deep. 



Dimensions: Figured specimen (U. S. Nat. Mus. Cat. No. 352665) 

 measures: Altitude 41 mm.; diameter 18 mm.; length of aperture 

 19 mm. ; diameter about 8 mm. 



The species has a general resemblance to AnclUa shepardi Dall. 

 from the " silex bed '' of the Tampa formation of Florida, but it 

 is a heavier shell and has a greater apical angle than Ball's species. 

 Although apparently related to the Jamaican species, A. ping ids 

 Guppy. it is easily separated. The Jamaican species is a smaller shell 

 and is roundly excavated at the suture. Guppy reports '•''AncillaHa 

 fameJlata " Guppy from Springvale." If his form is the same as in 

 our collection from Springvale, it was wrongly identified with his 

 species from Manzanilla. 



Occurrence. — Upper Miocene: Springvale, near Couva, Trinidad. 



ANCILLA CARONIANA Maury, subspecies SPRINGVALENSIS. new subspecies 



Plate 5, fig. 5 



There are two specimens from station 9195 and several specimens 

 from Montserrat, Trinidad (Guppy), deposited in the United 

 States National Museum which appear to be a subspecies of A. 

 caroniana. The Montserrat specimens are labelled Aticillarm 

 glandiformis Lamarck. The shell is shorter and stouter and the 

 whorls more inflated than A. caroniana., otherwise it is very 

 similar. 



Dimensions: Type (U. S. Nat. Mus. Cat. No. 362666) measures: 

 Altitude 35 mm.; greatest diameter 17 mm.; length of aperture 19 

 mm. : width about 8 mm. 



Type locality : 9195. Springvale, near Couva, Trinidad. 



Occurrence. — Upper Miocene: Montserrat, Trinidad (U. S. Nat. 

 Mus. Cat. No. 115566). 



ANCILLA BRASSICA Maury 



Ancilla irassica Maury, Bull. Amer. Paleont., vol. 10, no. 42, p. 199, pi. 33, 

 figs. 1, 8, 9, 1925. 



There are in the United States National Museum two specimens 

 collected from Guaico-Tamana Road, 2 chains east of mile 13 from 

 junction with eastern main road that compare with figure 9.^- 



"Agr. Soc. Trin. and Tobago Proc, vol. 10 (Paper 440), p. 452, 1910. 

 " Figures 1 and 8 appear to represent two different forms and may represent two differ- 

 ent species. 



