Zoological Society. 273 



painted are not les3 characteristic than the three faint sharply-no- 

 duled ribs. 



Chama Janus. Cham, testd circiter trigond, valvd inferiore et 



dimidio postici superioris Icevibus vel oblique obtuse liratis, squa- 



marum brevium seriebus duabus radiantibus, valvd superiore un- 



dique irregulariter appresso-squamatd, valvdrum marginibus lavi- 



bus; purpureo-rufd, liris obliquis squamisque albis. 



Hab. Gallapagos Islands (attached to the large Aviculce) ; Cuming. 



The general aspect of this shell is not much unlike that of C. 



venosa, but the difference may be easily detected on examination ; 



instead of being veined with fine lines of colour upon a white ground, 



the oblique ridges are raised upon a red ground ; besides this, the 



upper valve is characterized by a double style of both colour and 



sculpture, the anterior half being of a dull brick-red colour and ap- 



pressly scaled, whilst the posterior half is similar to the under valve. 



Mr. Broderip has figured this shell as the young C. imbricata, but it 



is far removed from that species. 



Chama rubea. Cham, testd ovatd, circiter trigond, valvis amba- 



bus rude Jlexuosis et appresso-laminatis, squamis perpaucis, val- 



varum marginibus subtilissime crenulatis, purpureo-rubrd, squamis 



albidis, intus albd, margine purpured. 



Hab. Cagayan, island of Mindanao, Philippines (attached to 



stones) ; Cuming. 



The under valve of the specimen here represented is more squa- 

 mate, and the scales are more erect than the upper. 



Chama Jukesii. Cham, testd ovatd, valvis ambabus profuse et 

 confertissim^ brevispinosis, spinis valvce inferioris subsquamatis ; 

 intus extusque nived, umbonibus apice pallide purpureis. 

 Hab. Cape Upstart, North Australia (on the coral reefs at low 

 water) ; Jukes. 



I dedicate this shell with a great deal of pleasure to Mr. Jukes, 

 the zealous naturalist of H. M.S. The Fly, to whom this monograph 

 is indebted through Mr. Cuming for several interesting species. 



Chama sarda. Cham, testd suborbiculari, valvis ambabus peculi- 

 ariter exiliter oblique striatis, squamis brevibus asperis remotis ; 

 intus extusque vivide corallo-rubrd. 

 Hab. Honduras (attached to coral) ; Dyson. 



Rich in colour and very characteristic in sculpture, being crossed 

 in an oblique direction throughout with faint striae, and roughened 

 here and there with short scales, like the asperities of a coarse file. 



The following paper, by Dr. J. H. Jonas, containing descriptions 

 of two new Shells, was also communicated by Hugh Cuming, Esq. 



Pyrula idoleum, Jonas. Pyr. testd oblongo-fusiformi, biconicd, 

 umbilicatd, testaceo-albd, transversim regular iter liratd, sulcis 

 interjectis angustis, liris sub lente squamosis ; anfractibus sex per 

 longitudinem leviter plicatis, medio acute angulatis ; angulo costd 

 undulatd munito ; costd squamis imbricatis oculo nudo vix conspi- 

 cuis distinctd ; caudd spird breviore, recurvd et squamis armatd ; 



