298 MR. A. GARRETT ON THE TERRESTRIAL [Mar. I, 



EUohium oparicum, PI. & A. Adams, Proc. Zool. Soc. 18.54, p. 9 ; 

 Gen. Moll. ii. p. 237. 



Auricula opurica, Pfeiffer, Syn. Auric, no. 4(5 ; Novlt. Conch, i. 

 p. 28, pi. 7. figs. 14-16 ; Men". Auric, i. p. 139. 



Auriculus suhula, Pfeiffer, Men. Pneum. (Auric.) iv. p. 360. 



Auriciilus elongatus, Pfeiffer, I. c. 



Auriculus oparicus, Pfeiffer, /. c. 



A very abundant s|)eeies, inhabiting the margins of mangrove- 

 swamps, and widely diffused throughout the group. Likewise 

 common to tlie Tonga and Samoa Islands, and generally distributed 

 over Melanesia. It has also been found at different points in the 

 East Indies; and Morelet records it from Mauritius. 



A small species, 9 to 16 millim.long, of a slender fusiform shape; 

 smooth, shining, longitudinally striated, acute, with a convexly- 

 conical spire, very frequently truncated by erosion, and more or 

 less lacerated at the suture. Body-whorl narrow, usually longer 

 than the spire, attenuated or rounded at the base, rarely rimate. 

 Aperture elongate, white, or light fulvous, sometimes livid, with a 

 compressed subtransverse plait on the lower part of the parietal wall, 

 and two small, oblique, approximating folds on the columella, the 

 upper one sometimes evanescent. Peristome obtuse, in old specimens 

 slightly sinuous above, and aduate next the suture. Colour white, 

 beneath an epidermis which varies from pale olivaceous horn-colour 

 to chestnut-black. 



A careful comparison of the descriptions of A. elonc/ata and 

 A. oparica has convinced me that they do not differ from A. subtila, 

 which Quoy obtained at the New Hebrides. Pfeiffer, in his descrip- 

 tion of A. elongata, mentions only a single columellar fold, and quotes 

 the Sanduich Islands, "Feejee," and one of the Philippines as 

 habitat. It certainly does not live on the former group. Schmeltz 

 cites one of the Caroline Islands and "Tahiti," the latter erro- 

 neous. A. oparica, which was described from specimens in Cuming's 

 Museum, is assigned to " insula Opara (ins. Societatis)." There is 

 no island of that name in the Society group ; but there is a very 

 small island, about 600 miles south of Tahiti, called Rapa-Oparee, 

 which from its small size and rugged surface is not likely to be the 

 home of the marsh-loving Auriculae. 



2. Auricula semisculpta, H. & A. Adams. 



Ellobium semisculptum, H. & A. Adams, Proc. Zool. Soc. 1854, 

 p. 9 ; Gen. Moll. ii. p. 237. 



Auricula semisculpta, Pfeiffer, Syn. Auric, no. 139 ; Mon. Auric, 

 i. p. 136 ; Novit. Conch, i. p. 39, pi. 10. figs. 7-9 ; Gassies, Faune 

 Nouv. Caled. p. 70, pi. 3. fig. 11; Schmeltz, Cat. Mus. Godeff. v. 

 p. 88. 



Auriculus semisculptus, Pfeififer, Mon. Pneum. (Auric.) iv. 

 p. 359. 



I found several hundred examples of this species in different 

 parts of the group. They were all found buried in rotten bogs on 



