220 LAND AND FRESHWATER 
The median teeth have a basal toothlet on the outer margin; the 
laterals are all biscuspid, the outermost being very small. 
Jaw (Pl. LXII. fig. 1a) with only a slight projection on the 
middle edge. 
Generative organs of G. hookeri, var. shillongensis.—In every way 
similar to Austenia gigas, Bs. The ovo-testis consists of five 
separate bunches or lobes of very minute globular follicles, each lobe 
having a separate duct leading to the main hermaphrodite-duct ; 
this gradually widens, and becomes much thickened, with several 
sharp convolutions; it then suddenly contracts again, leading to 
the junction of the albumen-gland. Here a short pear-shaped 
excum is conspicuous (only seen in one specimen). 
The albumen-gland was not perfect, but appeared as if formed of 
two lobes (from above specimen). 
The prostate was wide, ribbon-like; the oviduct with three or 
four great folds, which extend to the posterior termination of the 
spermatheca, which is not so long as to be infolded by it. The vas 
deferens is given off a very short distance below the end of sperma- 
theca, high up the oviduct ; and it extends backwards to near the 
base of the penis and amatory organ, in a loop, to join the former 
close behind a ceecum-like appendage rounded at the end (the cecum 
calciferum). The penis is bent on itself, where a long process is 
given off, to which the retractor muscle is attached. The amatory 
organ (dart-sac) is a long cylindrical body, becoming finer towards 
the posterior end; its retractor muscle has its attachment with that 
of the penis, close below the apex of the shell, in the body-cavity. 
The spermatheca is of the same size as the latter, and in this 
specimen presents a swollen sac below, terminating in a short, thin 
cylindrical point, which is buried amidst the convolutions of the 
oviduct. The form of spermatheca depends entirely on the number 
of spermatophores it contains. 
The spermatophore is similar to that of Austenia gigas, but rather 
shorter, the sac being 0°3 inch long. The cervicorn processes at the 
base are strong and numerous, much branched above (P. Z. S. 1880, 
pl. xxvii. figs. 8, 8a). The basal duct is 0-2 inch in length. Three 
of these were found in the spermatheca examined. 
GIRASIA HOOKERI, var. BRUNNEA, G.-A. (Plate LX. figs. 3, 4, 
from nature.) 
Girasia hookeri, var. brunnea, Godwin-Austen, Journ, A. S. B. 
1875, p. 5. 
Helicarion (sec. A) brunneus, Theob. Supp. Cat. p. 23. 
Parmarion brunneus, Nevill, Hand-list, p. 13. 
Helicarion brunneus, Pfr. ed. Cles. Nomen. Helic. Vivent. p. 30. 
Animal a rich brown, mottled on the mantle with dark sepia, dis- 
tinctly marked with parallel groovings, that extend from the zigzag 
pallial line running along the side of foot, the margin of which is 
edged below with a series of short, dark, fringe-like markings ; 
foot beneath dark ochre. Large portion of shell exposed, which is 
of same form as that of G. hookeri, var. shillongense. 
