GODWIN-AUSTEN : ANATOMY OF NEW HELICARION (?). 299 
slight pressure and transmitted light (Fig. 2d), what I take to be 
the spermatophore became visible. It is simple in form and devoid 
of spines, the two ovoid, solid, dark masses which are visible probably 
being a hardened collection of spermatozoa ; the portion between 
x and a’ has well-defined sides, and a lustrous appearance. 
The spermatheca is moderately long, swelling slightly at the 
posterior end. 
The radula (Fig 2f) has the formula 35:2: 10:1: 10: 2: 35. 
The central tooth is tricuspid, the admedians have one strong cusp 
on the outer side; in the 11th and 12th the cusp rises nearer to the 
point, then follow nine bicuspid teeth, succeeded by a well-marked 
tricuspid series, while the outermost teeth are very small with three 
serrate teeth. The jaw (Fig. 2e) is high in proportion to its width, 
semicircular above, solid in form, with a very small central projection 
on a slightly concave cutting ridge. 
Some of the remarks on the previous species apply equally to this 
one. The penis differs by the presence of a caecum from which the 
retractor muscle is given off; there is also considerable difference 
in the form of the jaw, and in the marginal teeth of the radula. 
The animal is not at all alike in the proportion of its parts to one 
another. I find it equally difficult to place it with certainty in any 
existing subgenus of micro-helices. 
EXPLANATION OF PLATE IX. 
Helicarion (?) Willeyana. 
Fic. 1. Animal, shell removed, viewed from the right side. x 5°3. 
la. Animal, shell removed, viewed from the left side; left shell-lobe turned 
down, showing under side. x 5:3. 
,, 1b. Left shell-lobe, in natural position, the divided left dorsal lobe below. x 5°3. 
lc. The generative organs. x 8°20. 
» ld. Jaw. x 20. 
5, le. Teeth of the radula: 8th-1 3th admedian, and outermost laterals. 
Helicarion (?) Woodwardt. 
Fig. 2. Anterior part of the animal, viewed from the right. x 5°3. 
2a. Animal viewed from the left. x 3. 
», 26. Animal seen from above, shell removed. x 5:3. 
2c. The generative organs. x 8-20. 
,, 2d. The penis, much enlarged, showing position of spermatophore. x 16. 
Qe. Jaw. x 20. 
,, 2f. Various teeth of the radula, from the rhachidian to the last laterals. 
apt 12ge- Shell. <x 3: 
c.r.p. cecum of the penis and retractor —_r.d.1. right dorsal lobe. 
muscle. y.m.p. retractor muscle of penis. 
l.d.l. left dorsal lobe. ; y.s.l. right shell-lobe. 
i.s.l. left shell-lobe. ves. ap. respiratory aperture. 
ov. oviduct. sp. spermatheca. 
p. penis. v.d. vas deferens. 
