NEW ANTILLEAN MOLLUSKS — REHDER 203 



The type, U. S. N. M. No. 411906, was collected by John B. Hender- 

 son. Jr., on Looe Key Reef, Fla , and measures: Height, 16.6 mm.; 

 breadth, 6.6 mm. Specimens in our collection show that this species 

 is restricted, as far as is known, to the lower Florida keys, from 

 Biscayne Bay to the Tortugas. 



This species is distinguished from the other Antillean members of 

 this group by its broader form, shorter spire, and distinctive white 

 spotting of the upper part of the axial ribs. 



Genus PYRGOCYTHARA Woodring, 1928 



PVRGOCYTHARA FILOSA, new species 



Plate 20, Figure 2. 



Shell rather small, elongate-ovate, solid. Nucleus dark brown, 

 globose, V/ 2 whorls, the first \\% whorls smooth, the following V4 

 whorl with fine, closely spaced, axial riblets. Th< postnuclear whorls 

 are strongly axially ribbed (10 on the penultimate whorl), the ribs 

 strongly angled at the shoulder; in the early whorls a spiral cord 

 occurs on the shoulder, and there are several below ; on the last two 

 whorls these spiral cords increase in number but at the same time 

 become obscure. Color brown except for a rather broad, spiral, yel- 

 lowish white band on the shoulder of the whorls. Aperture somewhat 

 narrow; outer lip internally thickened under the varixlike axial rib, 

 posterior sinus broad, as is the anterior channel. Interior brownish 

 in color. 



The type, U.S.N.M. No. 27637, measures: Height, 6.5 mm., 

 breadth, 2.8 mm. It was collected by Henry Hemphill at Marco, 

 Fla. There is one paratype from the same lot. 



This species differs from the only other described recent species 

 of Pyrgocythara (P. hemphilJi Bartsch and Rehder, 1939) in being 

 smaller and in having a different color pattern. 



U. S. GOVERNMENT PRINTING OFFICE: 1942 



