Mollusca. 57 



rubescens ; peristoma tcuuc, intus internum subincrassatum, 

 marginc coluinollari plus xuinus incrassato et reflexo, superne 

 •callo tcnui labro jimcto. Long. 9.V, diam. 5A -mm. ; apertura 5mm. 

 longa, 4^ lata. 



Only a single specimen of tliis species has hitherto been known. 

 The few examples obtained by Mr. Andrews ditfer in being of 

 :a very rich reddish colour. Tlie solidity, the strong lines of 

 .growth, and the spiral stria) are the principal distinguishing 

 features of the species. The transverse strife are rather coarse, 

 .and more conspicuous in some specimens than others. 



6. Succinea listeri, Smith. (PI. YIII, Figs. 12, 13.) 



Suceitiea ^stcri. Smith, P.Z.S., 1888, p. 537. 



Testa elongato-ovata, superne acuminata, tenuis, cornea, rubes- 

 cens ; anfractus 3, rapide crcsceutes, ultimxis permagnus, 

 incrementi lineis tenuibus striatus ; apertura elongata, ovata, 

 superne acuminata ; peristoma tenue, marginibus callo tcnuissimo 

 junctis. Long. 13|- mm., diam. maj. 8 mm.; apertura 10^ mm. 

 longa, 7 lata. 



This species differs in form and sculpture from both the other 

 species from the island. It is smoother, and has a shorter spire 

 and a longer body-whorl. 



Family STENOGYRID.^. 



7. Opeas suhula (Pfeiffer). (PI. YIII, Fig. 14.) 



Achatina stibiila, Pfeiffer, Wiegmauu's Arch. Naturg., 1839. vol. i, p. 352. 



Bulimus sitbula, lleeve, Conch. Icon., vol. v, pi. Ixix, fig. 494. 



Stenogyra [Oj^eas) stibula, Biuuey & Bland, Land and Fresh -■water Shells of 



North America, pt. i, p. 230, fig. 392. 

 Bulimus oparanui, Pfeiffer, P.Z.S., 1846, p. 34. 



Sal. — Many islands in the "NYest Indies, Florida, Mexico, 

 Venezuela, Fernando ]N"oronha, Borneo, Cochin China, Island of 

 Opara or Ilapa, etc. 



A single specimen obtained by Mr. Andrews is inseparable from 

 this species, which, as will be seen from the above localities, has 

 .a very wide range. I am unable to find any characters which 

 ■will distinguisli this species from 0. oparanus (Pfr.), the sculpture 

 being precisely similar in both. The crenulation at the suture, 

 especially in the upper whorls, a feature not noticed in the descrip- 

 tions, is very peculiar, and, although visible under a simple lens, 

 is best seen under a compound microscope. 



Binney and Bland account for the wide distribution of this 

 species by its transplantation with the banana and plantain 

 throughout the Tropics. These trees have been introduced into 

 Christmas Island from Java, and possibly the Opeas along with 

 them, although at present I am not aware of its having been 

 recorded from that island. 



