XVi. 
Cypreide. 
Trivia, Gray, 1832. 
T. europa, Mont. 
Ovula, Brug., 1789. 
O. patula, Penn. 
Erato, Risse, 1826. 
E. levis, Donovan. 
Aporrhaide. 
Aporrhais, Da Costa, 1778. 
A. pes-pelicani, Z. 
A. Serresianus, Mich. 
We have used this name in preference to Chenopus, FAil. (1836), since 
it was adopted by Dillwyn and Gray prior to the publication of 
Chenopus. 
Cerithiidee. 
Triforis, Deshayes, 1825. 
(type T. plicatus, Desh.) 
T. perversus, L. 
Bittium (Leach) Gray, 1847. 
(type) B, reticnlatum, Da Costa. 
Cerithiopsis, Forbes and Hanley, 1849. 
(type) C. tubercularis, Mont. 
. Barleei, Jeff. 
. Metaxe, D. Ch. 
. costulata, Moll. 
. metula, Lovén, 
. pulchella, Jeff. 
oO om 
Trichotropide. 
Trichotropis, Brod. and Sow., 1829, 
(type) T. borealis, Brod. and Sow. 
Turritellida. 
Turritella, Lam., 1799. 
(type) T. terebra, Z. 
Our species is now said not to be the true terebra of Linneus, and 
perhaps we had best use the name of communis, Risso. 
