THE MOLLUSCA—HEDLEY. 417 
TRUNCATELLA VALIDA, Pfeiffer. 
Pfeiffer, Zeits. Malak., 1846, p. 182; Conch. Cab., i., ‘“‘Truncatella,” 
fougy p. L), pl. il, figs. 7, &, 19, 20; 21, 23. 
Truncatella vitiana, Gould, Moll., U.S, Explor. Exped., 1852, p. 
109, pl. viii., figs. 126, 126a, 126d. 
Abundant at Funafuti where it has already been found by 
Graeffe.* This belongs to a semi-marine, semi-terrestrial assem- 
blage of which lT have already written that—‘The smallest islands 
which possess any life at all are usually stocked by these forms, 
which appear to range from Ceylon in the west, to the Sandwich 
Islands in the east, and to be limited north and south by the 
tropics.” + 
Gould remarked that 7’. vitiana, admitted to be variable in 
size, “is not very different from 7’. valida.” The differences in 
sculpture, sinall perforation, basal keel and posterior fusion of the 
ribs, on which he relied to separate the two, are shown by a series 
before me to be quite inconstant features. Smith says,{ ‘“ When 
the genus is re-monographed, it is probable that some older name 
will be discovered to replace that of valida.” A sentence which 
admirably expresses the assistance tendered by London writers 
to students of the Pacific Mollusca. 
OMPHALOTROPIS ZEBRIOLATA, J/ousson. 
Mousson, Journ. de Conch., xiil., 1865, p. 181, pl. xiv., fig. 11; xxi, 
1873, p. 108; Garrett, Proc. Zool. Soc., 1887, p. 308. 
Omphalotropis rotumana, Smith, Ann. Mag. Nat. Hist., (6). xx., 
1897, p. 552. 
Abundant under sticks and stones on the main islet of Funafuti. 
It had already been found here by Graeffe, who also observed it 
at Nukufetau, Vaitupu, and Niutao in the Ellice, Nukuiona, 
Uvea, Kanathia, Fiji, and Wallis Island. Authentic specimens 
of the unfigured O. rotomana enable me to confidently unite 
this with Mousson’s species. Some such conclusion seems indeed 
to have been anticipated by Smith, who alludes to this and others 
as likely to ‘“‘eventually prove to be slight variations of already 
known species.” 
ASSIMINEA NITIDA, Pease. 
Garrett, Proc. Zool. Soc., 1887, p. 314. 
Abundant on Funafuti, where it had already been collected by 
Graetie. 
Garrett, who gives a complete bibliography says: ‘This small 
species is generally distributed throughout all the groups from the 
Paumotus to the Viti Islands and New Caledonia.” 
* Mousson—Journ. de Conch. xxi., 1878, p. 109. 
+ Hedley—Proc. Linn. Soc. N.S.W. (2) vi., 1891, p. 101. 
{ Smith—Journ. Malak, v., 1896, p. 21. 
Cc 
