42 PROCEEDINGS OF THE NATIONAL MUSEUM vol. C6 



margin-varix and a serrated inner lip. The Montserrat specimens 

 are mentioned ^° by Dall ayIig states " In looking ovei^ the Guppy 

 collection, now in the National Museum, I find a species from 

 Cumana, labeled M. coniformis^ but which can not be distinguished 

 from M. cincta Kiener (No. 115599, U.S.N.M.) ; and another simi- 

 larly named from Montserrat, Trinidad, which is a PersicvZa, closely 

 related to P. ohesa^ Eedfield." 



The new species here described is very closely related to M. 

 {Persicula) arcuata Guppy described from " Ditrupa bed, Pointapier, 

 Trinidad," but that species though it may be an immature specimen, 

 is a proportionally wider shell and possesses an outer lip with lirae 

 far within its inner margin. 



The closest fossil ally is M. gravida Dall, a species described from 

 the Caloosahatchee formation (Pliocene) of Florida. The closest 

 recent ally, M. obesa Eedfield, has a more sloping posterior shoulder 

 than the new species. 



MargineUa {Persicula) couviana Maury ^" is closely related to the 

 new species but Maury'^s species has fewer plications on the columella. 



Type locality : Station 9195. Springvale, near Couva. 



Occurrence. — Upper Miocene: Montserrat, Trinidad (Guppy), 

 (U. S. Nat. Mus. Cat. No. 115600). 



Genus MITRA Lamarck 



MITRA LONGA Gabb var. COUVENSIS Maury 



Plate 7, figs. 9, 11 



Mitra henekeni Sowerby, Guppy, Sclent. Assn. Proc, Trinidad, p. 160, 1867; 



Agr. Soc. Trinidad and Tobago, vol. 10, Society Paper No. 440, p. 452 and 



p. 454, 1910. 

 Mitra longa Gabb var. couvensh Maury, Bull. Amer. Paleont., vol. 10, no. 42, 



p. 203, pi. 35, figs. 1, 4, 1925. 



Unfortunately the specimen is not entire — three or more of the 

 early whorls and the extremity of the canal are missing. The spire is 

 moderately acuminate and the body whorl much longer than the 

 spire. Whorls convex in outline, and constricted at the excavated 

 sutural area. Sculpture on the spire whorls of three to four, sharp, 

 narrow, well-separated raised, primary spiral lines, intercalated 

 with three to four secondary spirals which are axially crossed by 

 growth lines of about equal strength, giving the area a cancellated 

 appearance. Last whorl similarly sculptured, having 16 primary 

 spirals intercalated with 3 to 4 secondary ones. Aperture apparently 

 about one-half length of shell. Columella with five oblique folds, the 



" U. S. Nat. Mus. Proc., vol. 19, p. 310, 1896. 



'^Bull. Amer. Paleont., vol. 10, no. 42, p. 202, pi. 34, fig. 11, 1925. 



