44 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.66 



Mitra barnardensis Maury from the Chipola marl member of the 

 Ahim Bluff formation of Florida belongs in this same group. It is 

 a larger shell Avith more acuminate spire than the species here de- 

 scril>ed. 



Occurrence. — Middle or lower Miocene: In flood-wash, Caroni 

 County, Montserrat Ward, 1 mile south of Brasso. 



Genus SOLENOSTEIRA Dall 



SOLENOSTEIRA SEMIGLOBOSA Guppy 



Solenosteira semiglohosa Guppy, Agr. Soc. Trinidad and Tobago, Proc, vol. 11, 



1911, p. 200, pi. 2, figs. 5, 6. 

 Solenosteira semiglohosa Maxjey, Bull. Amer. Paleont., vol. 10, no. 42, p. 209, pi. 



36, fig. 1, 1925. 



This species is more closely related to Solenosteira vaughani Dall, 

 a Miocene species of Coe's Mill Run, Florida, than S. mengeana Dall, 

 a Pliocene species from Caloosahatchee River, Florida. HoAvever, it 

 is a much larger form and more globose in outline than either of 

 these species. In a general way, it resembles S. anomala Reeve of 

 the West Coast ranging from Magdalena Bay to Panama, but that 

 species has a much higher spire and more angled whorls. There is 

 one specimen in our collection from station 9195, Springvale, near 

 Couva, that agrees with Guppy's figures. 



Genus PHOS Montfort 



PHOS TRINITATENSIS, new species 



Plate 7, fig. 5 



Shell rather slender, solid, spire one-third length of last wdiorl, 

 consisting of about two smooth convex and constricted nuclear and 

 six moderately inflated and gradually enlarging postnuclear whorls. 

 Suture of postnuclear whorls flexuous and close-fitting. Axial 

 sculpture of postnuclear whorls of (seven on the penultimate and 

 eight on the last whorl) strong, rounded ribs extending forward on 

 the last whorl to the siphonal canal. Aside from these, there is 

 one on the early whorls and increasing to two on the later whorls 

 small axials between the major ribs, being nodulous at the intersec- 

 tion with the spirals. Spiral sculpture of (about six or seven on 

 the spire whorls and fifteen on the last whorl) keeled, raised, back- 

 ward-reflected, prominent primary lines overrunning the axials 

 and valleys Avith about equal strength. Medially between these, 

 there is a very fine spiral thread. Outer lip marked internally with 

 11 long, entering, sharp lirae. Columella biplicate at its lower ex- 

 tremity. Siphonal fasciole well developed, marked off behind by 

 a groove, and sculptured with five spirals. 



