ART. :22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 45 



Dimensions: Type (U. S. Nat. Mus. Cat. No. 352669) measures: 

 Altitude 22 mm,; greatest diameter, 11 mm.; length of aperture 

 10 mm. 



The neAv subspecies differs mainly from Phos seniicostatus in 

 having strong axials on the body Avhorl and a longer canal. Phos 

 fasciolatus Dall appears to be a distinct species and not "a form or 

 variety " of P. costatus as stated by Pilsbry.^^ Ball's species has a 

 different type of sculpture and nucleus. 



Type locality: Station 9219, Guaico-Tamana Road, 2 chains east 

 of mile 13 from junction with Eastern Main Road. 



Occurrence. — Middle or lower Miocene : In flood-wash, 9212 (var.) ; 

 1 mile south of Brasso. 



PHOS BULLBROOKI, new species 



Plate 7, fig. 4 



Shell small, solid, turrited, with acute spire, seven whorled in- 

 cluding three nuclear whorls. Nuclear whorls porcellaneous, smooth 

 except for a faint spiral below and near the suture, constricted, and 

 shouldered below the suture. Apical turn minute, third one large. 

 Following whorls strongly shouldered and excavated below the 

 flexuous and moderately appressed suture. Axial sculpture of (11 

 on the penultimate and 8 on the body whorl) strong, rounded 

 ribs, projecting behind over the subsutural sulcus and extending for- 

 ward on the spire whorls to the suture and on the body whorl to the 

 base. A small axial, nodulous at the intersection with the spiral, lies 

 in the major interaxial valleys. Spiral sculpture of (7 on the 

 penultimate whorl and 17 on the last whorl and canal) broadly- 

 rounded, prominent lines, beginning above at the shoulder and 

 continuing on the last whorl with equal strength over the axials 

 and valleys forward to the carina of the siphonal fasciole. Faint 

 secondary spirals intercalate the primary ones. Aperture about one- 

 half the length of the shell; canal twisted. Margin of outer lip 

 broken away. Columella w^ith two folds — the posterior one is ex- 

 ternal and marks off the siphonal fasciole behind and the anterior one 

 marginates the canal. Six spirals intercalate these folds. 



Dimensions: Type (U. S. Nat. Mus. Cat. No. 352670) measures: 

 Altitude 13.4 mm.; greatest diameter 7.3 nun.; length of aperture 

 0.5 mm. 



The new species is based upon one specimen, perhaps immature, but 

 it is well characterized. I am unable to find a very close relative to 

 this new species. 



Occun^ence. — Middle or lower Miocene: Guaico-Tamana Road, 

 2 chains east of mile 13 from junction with Eastern Main Road. 



18 Pilsbry, H. A., Revision of W. M. Gabb's Tertiary mollusca of Santo Domingo, Acad. 

 Nat. Sci. Phila. Proc, pt. 2, p. 349, 1922. 



