94 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



from the right cerebral ganglion, and the three pairs of connectives' 

 The cerebral commissure is broad, rather long, and arched, and 

 a sub-cerebral commissure also appears to be present. 



Buccal ganglia apparently double, each being divided by a 

 transverse furrow into an outer and an inner lobe. Nerves to the 

 oesophagus, salivary glands, etc., arising on each side from the 

 anterior angle of the outer lobe near the end of the cerebro-buccal 

 connective. Odontophoral nerves arising from the inner posterior 

 side of the inner lobe of each ganglion. Buccal commissure rather 

 short, uniting the inner lobes of the ganglia. 



Cerebro-pedal and cerebral-pleural connectives shorter than 

 usual. Pedal ganglia longer than broad, united by two short 

 commissures, and closely contiguous excepting in front, where they 

 diverge slightly. They a;re divided by slight transverse grooves 

 into three or four apparent segments, of which the most anterior 

 pair is the largest. Each ganglion gives off from its lower surface 

 a longitudinal row of about six pedal nerves, the last pair being 

 very large and passing straight backwards through the body- 

 cavity to the hinder part of the foot. The nerves to the sides of 

 the neck arise laterally near the short pleuro-pedal connectives. 

 No otocysts were found. 



Pleural and visceral centres very closely aggregated, but the 

 five ganglia distinguishable from one another. Right parietal 

 ganglion twice the size of the left ; from each arises a pallial 

 nerve. The two principal nerves arising from the abdominal 

 ganglion were traced as far as the region of the anus, and the upper 

 part of the common duct of the reproductive organs, respectively. 

 Some of the cells of the visceral ganglia are very large, as is often 

 the case, one at the posterior end of the abdominal ganglion being 

 nearly "25 mm. long. 



Jaw broad, 2"3 mm. long (when flattened), thin, and smooth, 

 excepting for the fine lines of growth and some traces of very 

 delicate transverse striae, but having a large, blunt, projecting 

 angle in the centre. 



Radula measuring about 4"1 X 1"9 mm. when flattened 

 out. Central and lateral teeth tricuspid, with rather long 

 mesocones, and short, separate ectocones, the outer edges of which 

 are sometimes slightly serrated. Endocones of lateral teeth rather 

 narrow, and attached to the mesocones excepting just at the 

 point. Marginal teeth five times as numerous as the laterals, 

 aculeate, and mainly unicuspid. Mesocones of marginal teeth 

 very long, except in the last eight or nine teeth, and only very 

 slightly curved. In the first two or three marginals, and in several 

 of the teeth towards the outer edge of the radula, the ectocone 

 is represented by a small projection on the outer side of the 

 mesocone near its base ; but in most of the marginals the ecto- 

 cone as well as the endocone is entirely absent. Bases of teeth 



