869 



shell with rounded whorls, crossed by deeply cut grooves. The 

 aperture is very remarkable in form; it has a posterior canal, 

 formed by a prominent fold, and a very distinct anterior canal, the 

 columella terminating abruptly. The aperture is expanded and 

 fringed ; colour greenish, with black spots. 



84. Cerithium curtum (pi. clxxxii. f. 153, 154), Nobis. 

 Cerith. testa, C. inciso siinili, sed spira longe breviore ; anfrac- 



tibus paucis. 



The specimen is in Mr. Metcalfe's collection, and may possibly 

 be a variety of C. incisum ; but the spire is so much shorter in 

 proportion, that we are compelled to give it a separate name. 



85. Cerithium Gallapaginis (pi. clxxxii. f. 155, 156), A. 

 Adams (Tympanotus). 



Cerith. testa subovali, fusco-nigrescente, sulcis spiralibus et costis 

 longitudinalibus moniliferis minute granulata; anfractibus octo 

 gradatim crescentibus subangulatis ; apertura subovali ; canali bre- 

 vissimo. 



A small, darkly coloured species, brought from the Gallapagos 

 by Mr. Cuming. It is granulated by ribs and grooves in both 

 directions ; the middle whorls are rather angulated. 



86. Cerithium breviculum (pi. clxxxi. f. 143), Soioerby, 

 Genera of Shells, Cerith. f. 1. 



Cerith. testa brevissima, ventricosa, spiraliter striata, seriatim 

 tuberculata, nigra vel grisea, nigro maculata ; spira brevi ; apertura 

 magna; labio externo acute denticulato, ultimo anfractu inferne 

 varicoso. 



A very short, ventricose, tuberculated shell, brought by Mr. 

 Cuming from the Philippines, and occurring in other collections. 



87. Cerithium Metcaleei (pi. clxxxii. f. 157, 158), iVoS^. 



Cerith. testa ventricosa, brevi, spiraHter striata, seriatim tuber- 

 culata, grisea, ad apicem flavida, tuberculis nigrescentibus, ad 

 dorsum elevata ; apertura magna ; labio externo crasso, albo, cre- 

 nulato. 



Resembling C. breviculum, but of a rather different shape. The 

 back is raised, and the aperture is thickened within. The only 

 specimen we have seen is the one figured from Mr. Metcalfe's 

 collection. 



88. Cerithium Bornii (pi. clxxxii. f. 175), Nobis. Cerith. 

 tuberculatum, Born, Ind. Mus. Cajs. non Linn. 



