MOLLUSCA. 27 



Family— CerithiacejE. 

 Cerithium. Bruguieres. 



104. Cerithium gemmatum, (Plate XI. fig. 5, 6.) Testa clavata subturrita, acuminata, nitida; 

 anfractibus planulatis, triseriatim granosis, serie superiore maxima, lineis rufis transversim ornatis, 

 prope labrum divergentibus, infra suturam albidis ; apertura alba, superne callosa ; columella in- 

 ferne producta, plica parva ; canali oblique descendente. 



Inhab. Panama. In situations where the floor is sandy mud, in from two or 

 three to seven fathoms or upwards. 



105. Cerithium pharos, (Plate XI. figs. 3, 4.) Testa attenuate elongata, laevigata, nitida, 

 lactea, interdum maculis fuscis quadratis tri- vel quadriseriatim ornata; anfractibus concinne plicatis, 

 superne paulisper coarctatis, lineis sparsis impressis decussatis; labro crenulato ; apertura utrinque 

 attenuata; columella uniplicata, callosa; canali horizontal. 



Inhab. Bow Island. Buried in the coral sand, under a few feet of water. 



In the individuals which are ornamented with the tessellated markings, we 

 have here a very attractive shell, and there is much chasteness in those which are 

 altogether white. In some respects it is a miniature of C. procemm, Kiener, 

 which also has a similar variety in the ornation. There is a peculiar contraction 

 in the upper part of the whorls, across the folds, and if the finger is passed over 

 the surface from the apex towards the base, it imparts a roughness almost equal 

 to a steel file. 



106. Cerithium macrostoma, (Plate XVI. figs. 11, 12.) Testa elongata, gracili, acuminata; 

 anfractibus rotundatis crebricostatis, transversim striatis, ultimo diaphano ecostato, ordinatim sul- 

 cato ; labro repando, inflexo ; columella obliqua. 



Inhab. Straits of Macassar. In eleven fathoms, among coarse sand. 



Triphoris. Deshayes. 



This is a group of interesting and very beautiful little shells. From their 

 minuteness they are likely to be passed over unheeded, but after a little examina- 

 tion, aided by a small magnifying power, the richness of their sculpture is brought 

 into notice, and now it is found not easy to speak too highly of their attractions. 

 Each species, too, is so distinctly and characteristically decorated, that a careful 

 attention to a brief synopsis is sufficient to identify them. We are indebted to 



