ART. 19 NEW SPECIES OF MOLLUSKS DALL. 9 



The very conspicuous sculpture differentiates the species from any- 

 other known from the region. The groove of the slit is inconspicuous 

 both outside and inside the shell. 



RTMULA AEQUISCULPTA, new species 



Shell very small, white, ovate, the apex at the posterior fourth of 

 the length, vertically incurved, not prominent; anal fissure about mid- 

 way of the anterior slope, rounded behind, acute in front; sculpture 

 •of about 40 radial equal ribs crossed by equal close concentric threads, 

 not nodulous where the threads over run the ribs; anterior slope 

 prominently convex, the posterior slope straight; interior white, the 

 margin slightly crenulate; height, 2.5; length, 5; diameter, 3 mm. 

 U. S. Nat. Mus. Cat. No. 333736. 



Dredged by J. B. Henderson, jr., off Ajax Reef, Florida, at his 

 station 368, in 80 to 100 fathoms. The species ranges south to Cuba. 



The species is relatively much shorter, and much smaller than R. 

 Jrenulata Dall, of the same region. 



DIADORA MICROSTICTA, new species 



Shell small, white, dotted more or less profusely with black spots, 

 which, especiallj'^ toward the apex, are rarely arranged in rays or con- 

 centric bands; margin oval, minutely denticulate; anal opening nar- 

 row, a little in front of the extreme apex which shows an eroded space; 

 anterior slope somewhat shorter and narrower than the posterior; 

 sculpture of major and (generally three) intercalary minor rays retic- 

 ulated by numerous concentric threads which form sublunate small 

 nodules where they cross the major rays and still smaller ones when 

 they cross the minor rays; interior white, the margin finely radially 

 grooved, the callus around the anal perforation sharply truncate 

 behind; height, 7; length, 15; diameter, 10 mm. U. S. Nat. Mus. 

 Cat. No. 333732. 



Distribution from South Florida to Cape San Roque, Brazil. 



This species has apparently been confused with varieties of D. alter- 

 nata Say, but when segregated the differences are obvious. 



PUNCTURELI-A HEMDERSONI, new species 



Shell superficially similar to P. princeps Mighels and Adams, and 

 best described differentially. The radiating ribs are stronger, and 

 shghtly more distant; finely and evenly, closely decussated by low 

 equal concentric threads over the whole surface, the interstices con- 

 spicuous, as if punctate; the anal slit is narrow, projected forward 

 with a longer furrow behind it than in princeps; internally the tube 

 in princeps is more prominent and furnished with lateral props 

 which are absent in hendersoni. Height of the latter, 6.5; length, 11; 

 diameter, 8 mm. U. S. Nat. Mus. Cat. No. 333723. 



