29G MR. A. GARRETT ON THE TERRESTRIAL [Mar. 1, 



and Taviuni. It also inhabits the Sandwich and Paumotu Islands, 

 and I found it very abundant and gregarious at the Gambler Islands. 

 A small, solid, ovate species with the spiral lirEe of P. liirsuta, 

 but more numerous, smoother, more crowded, and the aperture is 

 not so much contracted. The external varix is smaller, and the 

 base of the shell is more rounded than in the latter species. Colour 

 light brownish, sometimes corneous, usually with a faint pale zone 

 beneath the suture, and the aperture is more or less tinged with 

 brownish. The dentation is the same in both species. Length 3 

 to 5 millim. 



Genus Cassidula, Fcrussac. 

 1. Cassidula intuscarinata, Mousson. 



Auricula {Cassiiluhi) intuscarinata, Mousson, Journ. de Conch. 

 1870, p. 132, pi. 7. fig. 9. 



Cassidula intuscarinata, Schmeltz, Cat. Mus. Godeff. v. p. 88 ; 

 Pfeififer, Mon. Pneum. (Auric.) iv. p. 3.53. 



Occurs in profusion on the mud in mangrove-swamps at Viti 

 Levu and Vanua Levu. I have received the same species from 

 New Caledonia labelled C. mvstellina. 



This species, like nearly all the shells inhabiting swamps, is very 

 frequently stained and more or less eroded. When in good condition 

 it is of a brown or brownish-liver colour, sometimes olive-brown, with 

 an obscure pale band on the subangulated shoulder. Rarely light 

 fulvous-brown, with an indistinct light chestnut band between the 

 shoulder and the sutural line. The base, aperture, and the peristome 

 tawny flesh-colour, the latter with a stout external varix. The 

 shape of the shell is subovate, with spiral incised lines, and the 

 aperture is obauriform. The strongly labiated lip is deeply emargi- 

 nated above. Upper parietal tooth small, nodiform, and the plait 

 beneath is neaily transverse. Columellar fold slightly oblique. 

 Length 14 to 20 millim. 



"fe- 



2. Cassidula cuassiuscula, Mousson. 



Cassidula crassiuscula, Mousson, Jouru. de Conch. 1869, p. 343, 

 pi. 15. fig. 1 ; Paetel, Cat. Conch, p. 114; Pease, Proc. Zool. Soc. 

 1871, p. 477 ; Schmeltz, Cat. Mus. Godeff. v. p. 88 ; Pfeiifer, Mon. 

 Pneum. (Auric.) iv. p. 352. 



Auricula {Cassidula) crassiuscula, Mousson, Journ. de Conch. 

 1871, ]). 191. 



Cassidula nucleus, Gassies (Martvn ?), Faune Nouv. Caled. p. 71, 

 pi. 3. fig. 9. 



Like the preceding species, it occurs in profusion on the mud in 

 mangrove-swamps, but is more generally diffused throughout the 

 group. It also inhabits Tonga and the Samoa Islands. Mr. Layard, 

 of New Caledonia, sent me specimens collected in that island, 

 labelled " Melampus nucleus, Martyn." 



It has the same shape and dentation as C. intuscarinatus, but is 

 nnich more variable in colour, and in size ranges from 10 to 16 



