300 MR. A. GARRETT ON THE TERRESTRIAL [Mar. 1, 



I am inclined to believe that T. pacifica. Pease, from the Caroline 

 Islands, is identical with T. valida. 



2. Truncatella rustica, Mousson. 



Truncatella rustica, Mousson, Journ. de Conch. 1865, pi. 14. 

 fig. .8 ; Paetel, Cat. Conch, p. 118; Schmeltz, Cat. Mus. Godeff. v. 

 p. 104 ; Pfeiffer, Mon. Pneum. iv. p. 14. 



Truncatella costellifera. Pease, Proc. Zool. Soe. 1871, pp. 468, 

 477; PfeiiFer, jMon. Pneum. (Auric.) iv. p. 16. 



I found a few examples of this species at Taviuni, associated veith 

 T. vitiana. It was also obtained at "Wallis Island ( = " Uvea"), 

 where Dr. Graffe found the type specimens. Mr. Pease's T. costel- 

 lifera, which Mr. Brazier obtained at Vavau, Tonga Islands, is un- 

 doubtedly the same as T. rustica. 



It is smaller (6 to 7 millim. long), more slender, the aperture not 

 so large, and the ribs less numerous (20 to 25), and the basal keel is 

 more conspicuous than in T. valida, and is continuous with tlie large 

 rib just behind the peristome, which gives the latter a duplicated 

 appearance. The colour corneous or ruddy corneous. 



3. Truncatella ceylanica, Pfeiffer. 



Truncatella ceylanica, Pfeiffer, Proc. Zool. Soc. 1S56 ; Mon. 

 Auric. (Appendix) i. p. 186 ; H. Nevili, Enum. Pneum. Ceyl. 18/1, 

 p. 6 ; Tennent's Ceylon, i. p. 239. 



Truncatella teres, Pfeiffer, Proc. Zool. Soc. 1856, p. 336 ; Mon. 

 Auric. (Appendix) i. p. 188 ; Cox, Mon. Austr. Land-Shells, p. 92, 

 pi. 15. figs. 9, 9a, 96; Paetel, Cat. Conch, p. 118. 



Truncatella sewicostata, Montrouzier, Journ. de Conch. 1862, 

 p. 243, pi. 9. fig. 10 ; Pfeiffer, Mon. Pneum. iii. p. 6 ; Gassies, 

 Faune Nouv. Caled. p. 73, pi. 8. fig. 2 ; Paetel, Cat. Conch, p. 118 ; 

 Schmeltz, Cat. Mus. Godeff. v. p. 104. 



T'runcatella cerea, Gassies. 



Truncatella nitida, Gassies. 



We obtained many thousand specimens, in all stages of growth, 

 near high-water mark at Ovalau Island. 



This species may be distinguished by its rather thin shining 

 texture and more or less evanescent riblets, which are either well 

 developed on all the whorls, or entirely absent except at the sutures, 

 where they are reduced to plicate crenulations. Sometimes the crenu- 

 lations disappear, so that the shell is perfectly smooth and polished. 

 Some examples have the upper whorls ribbed, and the lower one 

 smooth or crenulated at the suture and base. 



Having lately received from my esteemed correspondent, Mr. E. 

 L. Layard, of New Caledonia, a lot of Truncatella ceylanica from 

 Ceylon, together with T. teres from the Comoro Islands, and many 

 examples of T. semicostata from New Caledonia, and after a critical 

 comparison of the three species, I have failed to discover a single 

 specific character to separate one from the other. Dr. Cos records 

 T. teres from N.E. Australia. 



Through the courtesy of the Rev. Montrouzier of New Caledonia, 



