854 



is very different ; the whorls much less distinct from each other, the 

 mouth smaller, and the canal shorter. It is found on the coasts 

 of East Africa. 



20. Cerithium recurvum (pi. clxxvi. f. 16, 17, 18), Nobis. 



Cerith. testa acuminata, alba, fulvo vcl rufo iriterpunctato ; an- 

 fractibus duodecim, triseriatim granosis, ultimo costellis septem 

 granosis ornato ; apertura postice canalifero ; labio externo cre- 

 nato ; labio intcrno antice incrassato, vix plicato ; canali antico 

 breviusculo recurvo. 



The upper whorls show three rows of granules, with spots of 

 colour between them. The young specimen with dark spots, and 

 the one hardly showing any, are Mr. Hanley's : that with orange 

 spots is Mr. Cuming's. The last whorl seems to narrow towards 

 the canal, and to turn upwards with it. Habitat unknown. 



1 b. A distinct canal, more or less produced, and generally a 

 plait on the tvjiper part of the columella. — Genus Ceri- 

 thium, as restricted by some authors. 



21. Cerithium nodulosum (pi. clxxviii. f. 42), Brug., Diet, 

 no. 8. C. aluco, Born, non Linn. Murex tuberosus, Dillw. 



Cerith. testa magna, crassa, pyrarnidali, rugosa, spiraliter sul- 

 cata, nodulis magnis obtusis armata, grisea, maculis fuscis sparsa ; 

 ultimo anfractu ad latus univaricoso ; apertura postice uniplicata ; 

 labio interno antice subtruncato seu uniplicato ; labio externo ex- 

 panso, sulcato, margine lacpieato antice super canalem incurvo. 



A large, rough shell, of grey colour, spotted with blackish- 

 brown, and having large knobs, about ten on each whorl, except- 

 ing the last, which is flattened in front, and has a large spread- 

 ing varix at the side. The inner lip has a kind of fold near each 

 end ; and the outer lip is spread, elevated above, and drawn round 

 over the canal at the lower part. It is strongly grooved and 

 fluted. The canal is rather short, and not much curved. ILab. 

 Molluccas, Lam. ; Philippines, Cum. 



22. Cerithium polygonum (pi. clxxviii. f. 46), Nobis. 



Cerith. testa pyrarnidali, grisea, spiraliter sulcata ; costis magnis, 

 regularibus, superne angulatis, continuis ; apertura ignota. 



The only specimen we have seen is in Mr. Cuming's collection, 

 but it is not full grown ; hence Ave can only describe it provision- 

 ally. It looks like the commencement of a very handsome shell, 

 which might be allied to the fossil C. gigas. Port Essington, Mr. 

 Juices, 



