] OS PROCEEDINGS OF THE MALACOLOGICAI SOCEETY. 



a third their length from the posterior end, divide into two bands, the 

 smaller of which supply the inferior tentacles. The right tentacle 

 retractor passes, through the genital branch, with the inferior retractor 

 on the left ; the male organs thus pass through the loop formed by 

 the two muscle bands. 



The nervous system, in its position, is characteristic of this group 

 of animals. The cerebral, pleural, and pedal ganglia with their 

 commissures and connectives, form a ring round the anterior portion 

 of the buccal mass ; the buccal ganglia are situate close behind the 

 entrance to the oesophagus ; a buccal nerve on each side unites with 

 the anterior ganglia, forming a small commissure encircling the 

 oesophagus and salivary ducts. Compared with Natalina Caffra, Fer., 

 there is no difference in the principal features, and Woodward's 

 figures and description of the nervous system of that animal apply 

 perfectly to R. Greenwoodi, Gray. 



2. Phytida Meesoni, Suter. PL XVII, Fig. 7. 



Two examples of this species were examined, both unfortunately 

 dead and dried up in the shells ; however, I offer a brief note touching 

 those features that were clearly distinguishable. The mantle has 

 an even margin ; there are two small lobes on the right side, 

 corresponding in position with the right and sub-median lobes in the 

 preceding species. The buccal mass has the form usual in this group 

 of animals ; the oesophagus and two salivary ducts enter in the anterior 

 third ; the salivary glands appear to be quite distinct from each other. 

 Suter has described and figured the dentition (Trans. Xew Zeal. 

 Inst , vol. xxii, p. 84, pi. xvii, fig. f, A) ; he gives the formula 

 12 : : 12, the tenth tooth largest and with an angular rib, the 

 eleventh less than half the size, and the twelfth minute. The radula 

 before me has a central tooth with twelve laterals on each side ; the 

 eleventh tooth is the largest, and has an angular rib, the twelfth less 

 than half its size ; there is no indication of the minute outer tooth. 



Genitalia (PI. XVII, Fig. 7). — The penis (p.) sickle- shaped, with the 

 retractor muscle (r.m.p.) at the posterior end; the vas-deferens (v.d.) 

 enters about the middle. The spermatheca (spr.) separates from the 

 oviduct about midway between the sacculated portion and the genital 

 cloaca ; it forms a slender tube adhering to the upper portion of the 

 oviduct ; its posterior extremity, also the albumen gland, etc., were lost 

 in extracting the animals. The pedal gland, pedal cavity, and position 

 of the nerve-collar are similar to those of It. Greenwoodi:, also the 

 right tentacle retractor passes through the genital branch. 



3. Phenea Cokesia, Gray. PI. XVII, Figs. 1-4. 



The animal is whitish in colour, with narrow grey lines radiating 

 to the foot-margin ; tentacles darker ; foot somewhat narrow, thrown 

 into minute undulations when the animal is in motion ; mantle slightly 

 projecting over the peristome of the shell. The mouth or lips minutely 

 crenulated ; this allows of considerable distension, and permits the 

 odontophore to be much protruded. The animal is apparently ovo- 

 vivipai'ous; a single embryonic shell (PI. XVII, Fig. l)was found 



