MoUusca. 57 



Tubescens ; peristoma tenue, intus interclum subincrassatum, 

 margine columellari plus minus incrassato et reflexo, superne 

 callo tenui labro juncto. Long. 9^, diam. 5|-mm. ; apertura 5 mm. 

 longa, 4^ lata. 



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

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

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

 growth, and the spiral striae are the principal distinguishing 

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

 -and more conspicuous in some specimens than others. 



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



Suceinea listeri, Smith, P.Z.S., 1888, p. 537. 



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

 cens ; anfractus 3, rapide crescentes, ultimus permagnus, 

 incrementi lineis tenuibus striatus ; apertura elongata, ovata, 

 superne acuminata ; peristoma tenue, marginibus callo tenuissimo 

 junctis. Long. 13 J 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 STENOGYEID^. 

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



^chatina subula, Pfeift'er, Wiegraann's Arch. Naturg., 1839, vol. i, p. 352. 



JBulimns subula, Reeve, Couch. Icon., vol. v, pi. Ixix, fig. 494. 



Stenogyra (Upeas) subula, Binney & Bland, Land and Fresh-water Shells of 



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

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



Hob. — Many islands in the West Indies, Florida, Mexico, 

 Yenezuela, Fernando IS'oronha, Eorneo, Cochin China, Island of 

 -Opara or Eapa, 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 distinguish 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 \dsible 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. 



