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



mediocriter convexis, costulis liris longitudinalibus decussatis, supra 

 subnodulosis ; ajjertura intus fasciis fuscis strigata ; columella alba. 

 Axis 1-4 poll. 



Habitat. The coast. 



ACEPHALA. 



Testacea. 



*Arcu gulactodes. Testa subrhomboidea, tumida, subsequilaterali, 

 antice subangulata, postice rotundata, multiradiata ; radiis exilissi- 

 mis auctus rugas decussantibus ; cardine mediocri terminis exteriori- 

 bus angulatis ; natibus leevibus remotiusculis, incurvatis ; margine 

 Izevi ; 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. 



^Drelssena purpurascens. Testa oblonga subquadrata, radiato-pli- 

 cata, sub epidermide albo purpureoque ornata ; intus margaritacea ; 

 epidermide brunnea ; apice subincurvato, compressiusculo. Long. 

 ]-5, lat. 0-8 poll. 



Habitat. Said to inhabit canals. 



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

 Iseviuscula ; antice angustata, postice dilatata, intus iridescente ; 

 epidermide olivacea, obscure radiata ; ala natibusque strigis flexuosis 

 spadicels ornatis ; basi leviter emarginata. 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 paralleli.^, 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) Lea'ii, Gray. Testa crassa, sub- 

 ovata, compressa, umbonibus dentibusque cardinalibus extremitati 

 antlcae angustiori approximatis ; valvse sinistrcC dente cardinali inte- 

 riori margineque cardinali pene parallelis, ilia versus dentem lateralem 

 mediocriter produclum spectante ; valvse dextree 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 nodulosis, testam exteriorera munien- 

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



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

 River. 



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

 Ann. ^ Mag. N. Hist. Vol. ix. 2 K 



