518 DR. A. GiXNTHER ON A ZOOLOGICAL [June 23, 



7. Littorina moluccana, Philippi. 



8. Littorina picta, Philippi. 



9. Littorina granicostata, sp. n. 

 *10. Neritaplicata, Linn. 



*11. Nerita maxima, Chemnitz. 

 *I2. Turbo lajonkairei, Deshayes. 



13. Succinea solidula, PfeifFer. 



14. Succinea solitaria, sp. n. 



15. Mela7npus luteus, Quoy and Gaimard. 



16. Melampus fasciatus, Deshayes. 



Succinea solidula, Pfeiffer ^. 



This species has never been figured nor has a locality been pre- 

 Tiously assigned to it. The two specimens from Christmas Island 

 agree in every respect with the types described by Pfeiffer in Mr. 

 Cuming's collection. There are two principal features which dis- 

 tinguish this form, namely, the thickened peristome and the peculiar 

 sculpture. The latter has the appearance (under a lens) of the texture 



1, 2. Succinea solidula. 

 3, 4. Succinea solitaria. 



of very fine linen, or minute crisscross lines, rather than of minute 

 granulations as described by Pfeiffer. Besides this excessively fine 

 ornamentation the surface exhibits rather strong lines of growth 

 or subplications. The thickening of the peristome is slight but 

 evident, and internal, hence Pfeiffer's expression "perist. submar- 

 ginatum." 



Succinea solitaria, sp. n. 



Shell rather obliquely ovate, acuminate above, rather solid, reddish 

 at the apex, paler on the second whorl and wax- white on the last ; 

 sculptured with very strong ridges of growth and coarse spiral striae ; 

 volutions 3, very rapidly enlarging, two first very convex, the 

 last sloping above and less rounded, oblique ; aperture roundly 



1 Proc. Zool. Soc. 1849, p. 134 ; Monogr. Hel. vol. iii. p. 22. 



