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MOLLUSCA FROM JUAN FERNANDEZ AND EASTER ISLAND 251 
In the genital organs (fig. 20) it appears, at a first glance, that the oviduct 
is filled, in adult specimens, with a small number of embryoes (about 6 were 
counted), the most advanced ones measuring 0,9 mm in height and their shell 
containing 27/2 whorls. A spermatheca with a long stalk is present, and 
likewise a well-developed albuminiparous gland, but no vesicula seminalis in the 
spermoviduct. From the comparatively large prostata gland, the vas deferens 
issues and follows the stalk of the spermatheca downwards, then the short 
vagina, and the penis upwards, till it debouches in the proximal part of the 
latter near its end. The penis is provided with a long and thick finger-like 
appendix, near the base of which a thin muscle extends backwards uniting in 

Fig. 19. Teeth from the radula of Pacificella variabilis n. sp. X 750. 
Fig. 20. Genital system of Pacéificella variabilis n. sp. Marking as in figs. 11 and 15. 
Fig. 21. Nervous system of Pacificella variabilis n. sp. Marking as in fig. 16; a, arteria pedalis; 
r. S., radula sac; s. g., salivary glands; s#, statocyst. 
.a shorter or longer space with the retractor penis posteriorly. The latter is 
attached to the diaphragma dorsally. The whole penis is situated completely 
to the right of the eye retractor, and these latter join each other and the 
retractor bulbi, and then attach to the columellar muscle. 
The central nervous system (fig. 21) shows 4 ganglia in the visceral loop: 
a right and a left pleural ganglion, a left parietal ganglion, and a visceral 
ganglion composed of the fused abdominal and right parietal ganglia. This is 
pressed towards the right side; the same features are observed in Coch/icopa 
(cf. SEMPER 1910", fig. 78). A rather long commissure exists between the 
cerebral ganglia, but the pedal ones are lodged close side by side. 
The characters of the penis, as well as the presence of an albuminiparous 
gland, are inconsistent with those of fam. Tornatellinidae as constituted by 
1 Bronn’s Klassen u. Ordnungen. II[. Mollusca. Pulmonata. 
