MOLLUSCA FROM JUAN FERNANDEZ AND EASTER ISLAND 



243 



with the right parietal gangHon fused with the abdominal one, and with a rather 

 short and broad cerebral commissure. 



The genital organs (fig. 17) are like those of Tornatellina in general. 

 From the gonad situated in the beginning of the third whorl and consisting of 

 crowded clusters of short finger-like branches, a short canal conducts to the 

 winding hermaphrodite canal, which in the fourth whorl becomes differentiated 

 in an ampulla receiving also the contents from a well-developed albuminiparous 



Fig. 16. Nervous sysX&\x\ oi Fernandezia buIimoidesVit\^QX. ^ buccal ganglia; f cerebal ganglia; 

 o oesophagus; p pedal ganglia; par parietal ganglion; ph pharynx; pi pleural ganglia; s. d. salivar)' 



duct; t tentacle; v visceral ganglion. 



Fig. 17. Genital organs of Fernaiidesia bulivwides Pfeiffer. Marking as in fig. 11. 



gland. From the same ampulla issues further, i) a rather wide vesicula seminalis, 

 extending downwards on the inside of the columellar muscle and ending blindly 

 fixed to the muscle in the same manner as in Tornatellina described above; 

 2) a seminal canal, commencing with a large prostata gland composed of a 

 crowded mass of short winding lobules from where the vas deferens rises; 3) the 

 oviduct which in all adult specimens examined was a very wide sac-like forma- 

 tion with thin walls, and contained a lot of young ones (up to 15), the largest 

 of which had a shell with 2 ^/2 whorls. 



The distal portions of the genital organs are rather simple. The wide 

 oviduct narrows to a short vagina, and carries, at the junction point, a sperma- 



