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



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

 cluabus e linea umbonali divaricantibus, posterioribus simplicioribus, 

 anterioribus basalibusque plerumque nodulosis ; natibus mediocriter 

 prominentibus ; epideriBide nigrescente, striis subimbricatis. Valvse 

 sinistrse dente cardinal! interiori versus angulum marginis posterioris 

 basalisque spectante, ad latus exterius laminis pluribus munito, dente 

 exterior! pene obsolete, brevi, a basi interioris divaricato ; dente la- 

 teral! brevi crasso. Long. 2"C5, lat. 3*5 poll. 



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

 tvimidiuscula, polita, intiis 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, naargi- 

 nibus violaceis, denticulatis, extrinsecus radiis violaceis plicisque 

 concentricis exilissimis ornata ; disco plerumque feiTUgineo, dente 

 cardinal! postico bifido, saepe bilobato, laminae cardinalis extremitate 

 postica concava. Long. Vl , lat. r65 poll. 



Habitat. Said to inhabit canals. 



* Sanguinolaria iridescens. Testa subelliptica, corapressa, albida, 

 iridescente, versus apicem incarnata, exilissime transverse striata, 

 strii.'? obsoletis radiatim decussata ; latere postico subrostrato, sub- 

 angulato, antico longiore, rotundato. 



Habitat. Said to inhabit canals. 



*Novaculina constricta. Testa alba, tenui, transverse oblongS, 

 Ifeviuscula, extremitatibus rotundatis, radio mediano subconstricta, 

 epidermide olivaceo-flavesccnte, postice quasi capillis intertextis ad- 

 hserentibus vestita. Lat. 2"45, long. 0*75 poll. 



Syn. Solen constrictus, Lamarck. 



6. ANNELiDES. 



HiRUDIXIDjE. 



*Bdella lineata. B. superne brunneo-viridescens, linea dorsali me- 

 dia aurantiaca, infra griseo-flavescens. 



Greenish brown above, with an orange-coloured dorsal line ; be- 

 neath yellowish gray. 



7. CRUSTACEA. 

 Decapoda Erachyura. 



*Carcinus olivaceus. C. suprii olivaceo-viridescens ; infra albus ; 

 parte anteriore marginis interni femoris spina armata. 



Greenish olive above ; beneath white, with a single spine on the 

 anterior j^art of the internal margin of the femur. 



*Sesarma tetragona. S. superne viridis, infra griseo-viridescens ; 

 brachiis manibusque rubris. 



Carapace green ; sternum and legs greenish gray ; arms and claws 

 red. 



Sesarma quadrat a, M. Edwards. 



