242 BIVALVE SHELLS. 



II. Cyrenee anomales. 



a. Testa ovata, turgidula, 42-49. 



b. Testa tenuis, rotundata, cordiformis, 50-58. 



III. Species incertee, 59, 60. 



I. Cyrence vertB. 



A. Testa ovata, suhorbicularis vel subtrigona. 



a. Testa subtrigona. 



1. Cyrena triangularis. 



C. testa trigona, solidiuscula, epidermide fusco-virescente, trans- 

 versim striata, striis marginalibus lateralibusque eminentioribus, 

 sulco ab umbone ad marginem posteriorem leviter impressa ; 

 margine antico descendente, vix excavato, angulo anteriore 

 rotundato ; margine superiore subrotundato, postico fere bian- 

 gulato ; valvis intus lacteis, margine continuo nitentiore ; den- 

 tibus cardinalibus in utraque valva tribus, duobus bifidis ; den- 

 tibus lateralibus brevibus, tenuissime nigosis haud striatis. 



Cyrena triangularis, Metcalfe, Proc. Zool. Soc. 1851, p. 74. no. 36. 



Hab. Borneo. 



2. CVRENA TURGIDA. 



C.testatrigona,inflata,parte antica turgida, rugosa, inaequilaterali, 

 transversim rugata ; valvulis crassis ; natibus elevatis, recurvis ; 

 dentibus cardinalibus sub-bifidis ; dente anteriore laterali brevi 

 et elevato, posteriore longo et laminato ; margarita alba. 



Cvrena turgida, Lea, Trans. of Amer. Phil. Soc. v. 109. pl. 18. 

 'f. 53; Observ. on the Genus Unio, i. 221. pl. 18. f. 53. 



Hanley, Descr. Cat. i. 93 ; in Wood, Ind. Test. Suppl. 2. 

 pl. 14. f. 50. 



Hab. In fluviis Indise. 



3. Cyrena Sumatrensis. 



C. testa ovali, gibbosa, crassa, intus alba aut flavescente, extus 

 fusco-virescente ; dentibus cardinalibus tribus, duobus majori- 

 bus, angulatis, sub-bifidis, dentibus lateralibus brevibus, tenu- 

 issime mgosis. 



Cyrena Sumatrensis, Sow. Gen. of Shells, f. 1-4. 

 Desh. Lamk. An. s. Vert. ed. 2. vi. 2/7. no. 15. 

 Reeve, Conch. Syst. pl. 63. 

 Hanley,Descr. Cat.^.M;inWood, Ind. Test. Sup.2.T^\. 15.f.l. 



Hab. In rivulis insulse Sumatrensis. 



