Dr. Cantor on the Flora and Fauna of Chusan. 489 



mediocriter convexis, costulis liris longitudinalibus decussatis, supra 

 subnodulosis ; apertura intus fasciis fuscis strigata ; columella alba. 

 Axis 1-4 poll. 



Habitat. The coast. 



ACEPHALA. 



Testacea. 



*Arca galactodes. Testa subrhomboidea, tumida, subaequilaterali, 

 antice subangulata, postice rotundata, multiradiatd ; radiis exilissi- 

 mis auctus rugas decussantibus ; cardine mediocri terminis exteriori- 

 bus angulatis ; natibus Isevibus remotiusculis, incurvatis ; margine 

 laevi ; epidermide fusca. Lat. 0"75, long. 0*5 poll. 



Habitat. Said to inhabit canals. 



*Mytilus niger. Testa oblonga, trigona ; cardine unidentato ; na- 

 tibus subincurvatis, decorticatis, sub epidermide albis, marginibus 

 purpurascentibus ; intiis margaritaceo-splendida, margine purpureo. 

 Long. 3-4 poll, lat. 1-7. 



Habitat. Said to inhabit canals. 



*Dreissena purpurascens . Testa oblonga subquadrata, radiato-pli- 

 catd, sub epidermide albo purpureoque ornate ; intus margaritacea ; 

 epidermide brunnea ; apice subincurvato, compressiusculo. Long. 

 1-5, lat. 0-8 poll. 



Habitat. Said to inhabit canals. 



*Modiola Senhousia. Testa transversa oblonga, subalata, gibb^, 

 laeviuscula ; antic^ angustata, postice dilatata, intiis iridescente ; 

 epidermide olivacea, obscure radiata ; ala natibusque strigis flexuosis 

 spadiceis ornatis ; basi leviter eraarginata. Long. 1'2, lat. 0*6 poll. 



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 parallelis, subdistantibus, area postica radiis tri- 

 bus approximatis, leviter elevatis, rugosulis munita, margarita interius 

 albida versus apicem aurantio-tabescente, versus marginem purpureo 

 viridique splendid^ margaritacea ; margine fusco ; epidermide oli- 

 vace^, 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 

 anticse angustiori approximatis ; valvse sinistrse dente cardinali inte- 

 riori margineque cardinali pen^ parallelis, ilia versus dentem lateralem 

 mediocriter productum spectante ; valvse dextrse dente cardinali unico 

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

 lide salmonis colore tincta ; natibus minime prominentibus ; rugis 

 seriebus duabus e linea umbonali divaricatis, posterioribus simplici- 

 bus, anterioribus, basalibusque nodulosis, testam exteriorem munien- 

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



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

 River. 



*Umo (Theliderma) divergens. Testa crassa, angulato-ovata, sub- 

 Ann. §• Mag. N. Hist. Vol. ix. 2 K 



