198 PROCEEDINGS OF THE NATIONAL MUSEUM vol.93 



This species is more than twice as large as the most closely related 

 species, Oocorys barbouri Clench and Aguayo, from off northern 

 Cuba, and is, moreover, more inflated, is without a color band, and has 

 no headed spiral cord on the shoulder. 



A second, slightly smaller specimen, U.S.N.M. No. 417859, came 

 from the Henderson collection and is labeled merely Florida. 



PSAROSTOLA, 5 new genus 



Shell small, slender. Nucleus inflated, glassy white, smooth, of l l / 2 

 whorls. Sculpture on postnuclear whorls consists of rather narrow 

 ribs crossed by strong spiral cords which form nodules on crossing 

 the ribs. Anterior canal hardly noticeable, siphonal fasciole weak. 

 Aperture narrow; interior of outer lip denticulate, with a moderately 

 narrow sinus below the suture ; inner lip smooth. 



Type: Columbella monilifera Sowerby, West Indies. 



This genus is apparently near Nassarlna Dall and Cigclirma Wood- 

 ring but differs from them in that no attenuation of the base into an 

 anterior canal is noticeable on the outer lip, being more like Zancis- 

 sarina Pilsbry and Lowe, 1932, in this respect ; from this it differs in 

 the smaller, more inflated nucleus. Anachis tincta Carpenter from 

 Cape San Lucas, Baja California, is apparently a member of this 

 genus. 



PSAROSTOLA MONILIFERA SPARSIPUNCTATA, new subspecies 



Plate 20, Figure 11 



Differs from the typical species in the reduction of the chestnut 

 spotting on the whorls. Instead of the upper three spiral cords being 

 elongately maculated, only the two upper cords are furnished with 

 short spots and alternate axial ribs. Likewise, the spotting is weaker 

 below the periphery on the last whorl. The shell is usually some- 

 what broader in outline, and the axial ribbing may be a little stronger 

 than in the typical form. 



The type, U.S.N.M. No. 450778, measures: Height, 4.9 mm.; 

 breadth, 2.1 mm. It was collected by John B. Henderson. Jr.. in 45 

 fathoms southeast of Fowey Light, Fla., at Eolis Station 357. In 

 our collection we have other specimens from the Florida Keys and 

 from the north coast of Cuba. 



This subspecies is therefore restricted to the region about the 

 Straits of Florida, while typical monilifera we possess from Bermuda, 

 Jamaica, and Haiti. 



5 4>a.pfc, maculated + aroX-n, robe. 



