6(1 Air. W. E. Collinge on the Anatomy of 



History and riiilosophical Society for defraying the cost of 

 the drawings illustrating this paj)er. 



The anatomy of the Agnathous Pulmonates has received 

 but little attention ; hence anything like a classification based 

 on anatomical characters is at present quite impossible. 

 Woodward * has given an interesting account of Natalina 

 cuffra, Fer., and other contributions to the anatomy of this 

 genus have been made by Pilsl)ry f and Pace X- Godwin- 

 Austen § has given an account of the anatomy of Parypkanta 

 IJochstettert, Pfr. ; but I am unable to confirm many of his 

 statements. Other references to the anatomy of the Austra- 

 lian and New Zealand species are to be found in the various 

 papers of Hedley and Suter. 



Rhytida, Albers. 

 Rhytida Greenwoodij Gray. (PI. I. figs. 1-16.) 



Animal yellowish brown, darker on the dorsum anteriorly; 

 a deep groove characterizes the median dorsal line beyond 

 the visceral mass. Mantle yellow, with irregular black 

 markings ; collar shows slight indications of division into 

 right and left mantle-lobes. Eyes situated some little 

 distance backward from the end of the upper tentacle. Male 

 generative orifice 10 millim., female generative orifice 

 11 millim. from the right upper tentacle. Rugae on the head 

 almost square, on the sides of the body anteriorly round, in 

 parallel lines in both cases; posteriorly very small and irre- 

 gular. Sulci faint sepia-colour or white. Peripodial groove 

 ill-defined. Foot-fringe whitish, with very minute sepia- 

 coloured spots. Lineoles absent. Foot-sole not distinctly 

 divided into median and lateral planes, laterally sepia- 

 coloured, dirty white in the median portion. 



Length (in alcohol) 38 millim. 



Hah. Levin, Manawater, New Zealand. 



This species, the type of the genus, was described by Gray 

 in 1849 (|. All the descriptions yet given, such, for example, 

 as those by Reeved, Pfeiffer **, Hector ft, Button If, and 



♦ Proc. Malac. Soc. Lond. 1895, vol. i. pp. 270-277, pi. xvii. 



t Proc. Acad. Nat. Sci. Philad. 1889, pp. 277-279, and 1890, pp. 241- 

 243. 



X Proc. Malac. Soc. Lond. 189-5, vol. i. pp. 232-233. 



§ Op. cit. 1893, vol. i. pp. 5-9, pi. i. 



II Proc. Zool. Soc. 1849, p. 1H5. 



f Conch. Icon. vol. vii. sp. 434, pi. Ixxxi. fig. 434. 

 ** Mon. Hel. viv. vol. iii. p. 15fj. 

 tt Catal. Land Moll. N. Zeal. 1873, p. 18. 

 X\ Man. N. Zeal. Moll. 1880, p. IG. 



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