34 Dr. Cantor on the Flora and Fauna of Chusan. 



cats., sub epidermide albo purpureoque ornata ; intus margaritacea ; 

 epidermide brunnea ; apice subincurvato, compressiusculo. Long. 

 1-5, lat. 0-8 poll. 



Habitat. Said to inhabit canals. 



*Modiola Senhousia. Testa transverse oblonga, subalata, gibba, 

 Iseviuscula ; antic6 angustata, postice dilatata, intvis iridescente ; 

 epidermide olivacea, obscure radiata ; ala, natibusque strigis flexuosis 

 spadiceis ornatis ; basi leviter emarginata. Long. 1*2, lat. 0*6 poU. 



Habitat. Coasts of Chusan and Canton Province. 



*Anodon gibbum. Testa fragili, ovata, tumida, antice rotundata, 

 postice subalata, extremitate postica subangulata ; natibus concen- 

 tricis rugosis, rugis paraUelis, subdistantibus, area postica radiis tri- 

 bus approximatis, leviter elevatis, rugosulis munita, margarita interius 

 albida versus apicem aurantio-tabescente, versus marginem purpureo 

 viridique splendide margaritacea ; margine fusco ; epidermide oli- 

 vacea, obscure radiata. Long. 2'0, lat. 3"2 poll. 



Habitat. Canals. 



*Unio {Theliderma, Swainson) Leaii, Gray. Testa crassa, sub- 

 ovata, compressa, umbonibus dentibusque cardinalibus extremitati 

 anticae angustiori approximatis ; valvse sinistrse dente cardinali inte- 

 riori margineque cardinfili pene parallelis, ilia versus dentem lateralem 

 mediocriter productum spectante ; valvse dextrse dente cardinali unico 

 crenato ; valvis intus minime profundis ; margarita iridescente, pal- 

 lide salmonis colore tincta ; natibus minime prominentibus ; rugis 

 seriebus duabus e linea umbonali divaricatis, posterioribus simplici- 

 bus, anterioribus, basalibusque nodid.osis, testam exteriorem munien- 

 tibus ; epidermide flavo-olivacea. Long. 2, lat. 3 poll. 



Habitat. Said to inhabit fresh water at Chusan, and also Canton 

 River. 



*Unio {Theliderma) divergens. Testa crassa, angulato- ovata, sub- 

 alata, tumidiuscula, facie externa tuberculato-plicata, rugis seriebus 

 duabus e linea umbonali divaricantibus, posterioribus simplicioribus, 

 anterioribus basalibusque plerumque nodulosis ; natibus mediocriter 

 prominentibus ; epidermide nigrescente, striis subimbricatis. Valvae 

 sinistrse dente cardinali interiori versus angulum marginis posterioris 

 basalisque spectante, ad latus exterius laminis pluribus munito, dente 

 exteriori pene obsoleto, brevi, a basi interioris divaricato ; dente la- 

 teral! brevi crasso. Long. 2" 65, lat. 3*5 poll. 



*Corbicula fuscata. Testa cordata subinsequilaterali, fusco-virente, 

 tumidiuscula, polita, inttis et ad nates violacea, extrinseciis sulcis 

 crebris circumdata, rugis intersitis subimbricatis ; margine interiori 

 plerumque nigrescente; natibus decorticatis. Lat. 1*3, long. 1*15 

 poll. 



Habitat. Canals. 



Venus sinensis, Auct. Testa orbiculata, convexa, albida, margi- 

 nibus violaceis, denticulatis, extrinseciis radiis violaceis plicisque 

 concentricis exilissimis ornata ; disco plerumque feiTUgineo, dente 

 cardinali postico bifido, ssepe bilobato, laminae cardinalis extremitate 

 postica concava. Long. Vl , lat. 165 poll. 



Habitat. Said to inhabit canals. 



