20 GASTROCOPTA, NORTH AMERICA, WEST INDIES. 



The type is drawn in fig. 10, a specimen from Gallinas 

 canyon in fig. 11. 



I/. G. ARMIPERA CLAPPI (Sterki). PI. 1, figs. 7, 8, 9. 



"Shell glossy, colorless to milky- whitish, perforate, cylin- 

 drical in the lower 3 to 4 whorls, conical or subconical above, 

 with a rather acute apex; whorls Gy 2 to iy 2 , the upper ones 

 rather narrow, the lower ones broader and less convex, the 

 last moderately large, ascending at the aperture, somewhat 

 narrow but rounded at the base, slightly flattened over the 

 palate; surface shining, with slight irregular to subregular 

 strias ; aperture nearly oval, margins approximate ; peristome 

 everted, not thickened, but there is a slight to rather strong 

 white callous in the palate ; lamellae and plica? : parieto- 

 angular distinctly complex, rather long, moderately elevated, 

 connecting with the peristome near its outer upper terminus 

 (much as in B. armifera), the spur of the parietal moderately 

 large ; eolumellar axial spiral, with the lower end nearer the 

 aperture, thicker and rather abrupt, or somewhat bifurcate; 

 'basal' (inferior columellar) slight or wanting; upper and 

 lower palatals regular, an interpalatal in many specimens; 

 suprapalatal wanting or quite small. Alt. 3.5 to 4 (rarely 

 3.2 to 3.4), diam. 1.9 to 2.1 mm.; aperture alt. 1.5, diam. 

 1.2 mm. 



"Soft parts, seen only from one dried Alabama specimen, 

 soaked, very dark from copious, deep brown pigment. Jaw 

 amber-colored, strongly curved, rather broad, rounded at the 

 ends, its surface with numerous radial rib-striae; the line of 

 the attachment of the tenaculum strong. Radula with 78 

 transverse rows of 27 (or 29) teeth, r -(- 6 -f- 7 (8) ; rachidiaii 

 rather narrow, with a short mesodont and very small ecto- 

 donts (barely visible) ; laterals bicuspid, with the mesodont 

 as long as the plate, the ectodont about one-third as long; 

 the outer posterior angle of the plate raised, cusp-like; sev- 

 enth and eighth with the ectodont split in two, somewhat 

 intermediate or 'transition' teeth; marginals (9-13) ser- 

 rate, with the mesodont rather long, thin; the fourteenth a 

 barely visible irregular transverse bar, or wanting. As this 



