LITTORINIDE. 157 
These last agree well with Indian Ocean specimens; they 
measure—long. 123, diam. 8 mil.; the sculpture oftentimes 
becomes subobsolete, and the length of the spire varies in 
specimens from the same locality. 
Sub-Genus HOHINELLA, Swainson, 
Treat. Malac., 1840, type E. coronaria, Lamarck. 
62. Littorina (Echinella) cumingi. 
Trochus cumingi, Philippt, P. Zool. S., 1845, Guimaras (erron. ?). 
3 Roratonga ; coll. H. Pease, Esq. 
63. Littorina (Echinella) coronaria [?] 
Monodonta coronaria, Lamarck, Hist., 1822, Hab.?; Lord Hood’s Island, 
Jide Cuming ; Hervey Island, in Cat. Mus. Godeffroy. 
5 Roratonga; coll. H, Pease, Esq., and Asiatic Soc., Bengal. 
These all agree best with Philippi’s figures 2 and 6 of PI. II, 
said to be L. bullata, Martyn, from N. Zealand [=L. papillosa, 
Lam.]; I preserve as above, however, the name under which 
they were sent me by Mr. Pease ; from von Marten’s remarks in 
the Donum Bism., the distinctiveness of the two forms appears 
to be very doubtful. Philippi gives as localities for L. bullata 
Zanzibar and Swan Point [Australia]. 
Genus LIMNOTROCHUS, #. A. Snuth. 
Ann. Mag. 1880, type L. kirkt, Smith. 
EH. A. Smith describes the operculum of Limn. thomsont 
as“ horny, paucispiral and littorinoid.” 
1. Limnotrochus kirkii. 
Limnotrochus kirkii, 2. 4. Smith, Ann. Mag., 1880, Lake Tanganyika, 
1 Lake Tanganyika [typical]; ex Mr. Damon. 
Genus PLESIOTROCHUS, Fischer. 
J. de C., 1878, type P. souverbianus, Fischer [Loyalty 7.}. 
