NATURAL SCTENCES OF PHILADELPHIA. 249 
which about 25 may be called laterals, but the change to margi- 
nals is hardly marked, these last differing only in being smaller, 
in having amore square base of attachment, and in having more 
obtuse and more proportionally developed cutting points; there 
is no splitting of the inner cutting point of the marginals. The 
centrals have subobsolete side cusps, but decided side cutting 
points; the central cusp is short and stout, the base of attach- 
ment has greatly expanded lower lateral angles. lLaterals like 
the centrals, but unsymmetrical as usual. 
The dentition of this species resembles that of provisoria and 
notabilis of the same subgenus. 
The genitalia are figured on pl. XIX., fig. 8. The penis sac 
(p.s.) is stout, rounded, with long, pointed apex; the vas deferens 
(v. d.) enters it below the apex; the retractor muscle (r.) is in- 
serted in the vas deferens just before it enters the penis sac. 
The genital bladder (g.b.) is short, cylindrical, with blunt end; 
its duct is short and small. The penis sac enters the vagina 
Opposite the entrance of the genital bladder. 
Helix (Carocolus) sagemon, Beck. 
Cuba. Mr. Arango to Mr. T. Bland. 
Jaw high, arcuate, ends rapidly but slightly attenuated, blunt ; 
cutting margin with broad, blunt, median projection; no anterior 
ribs. 
Lingual membrane (pl. X XI., fig. 4) very long and narrow, with 
36—1—36 teeth, the transverse rows of teeth being unusually ob- 
lique. The change from laterals to marginals is so gradual that it 
is difficult to say how many of the former there are. Centrals with 
base of attachment long, constricted at the middle, expanded 
above and with greatly produced lower lateral expansions ; reflec- 
tion large, with obsolete side cusps and no side cutting points, and 
with a very broad, short median cusp, bearing a short, widely 
expanded, square cutting edge (as it cannot be called a point). 
Laterals like the centrals, but unsymmetrical as usual, and with 
an unsymmetrical cutting edge larger than in the central tooth. 
The cutting edge becomes more developed as the teeth pass off 
laterally, in proportion to the base of attachment and the cusp 
also. Thus the marginals become formed without any splitting 
of the inner cutting point, or any development of a side cusp and 
17 
