BIVALVE SHELLS. 205 



Glauconome straminea, Reeve, Proc. Zool. Soc. 1844, p. 20; 

 Conch. Icon. pi. 1. f. 2. 



Catlow, Conch. Norn. p. 7- no. 8. 



Hub. Ad oras fluviorum in sinu Manillae. 



10. Glauconome Psammotella. 



G. testa ovato-transversa, lata, lateraliter depressa, insequilate- 

 rali, antiee brevi, obtusa, postice attenuata, obtuse subaiigulata, 

 transversiin tenue et irregulariter striata ; epidermide squalide 

 fusco induta, apicibus erosa ; margine dorsali postico leviter 

 arcuate et declivi, valvis intus albis ; sinu pallii angusto, pro- 

 fundo, apice obtuso, marginibus suis fere parallelis. 



Glauconome Psammotella, Dssh. Proc. Zool. Soc. 1853. 



Hab. ? Coll. Cumins. 



'n* 



11. Glauconome rostralis. 



G. testa elongato-angusta, depressa, sub<equilaterali, tenui, viridi, 

 antiee obtusa, in medio dilatata, jiostice attenuata, angulata, 

 subrostrata; latere antico transversim irregulariter striato, 

 postico sulcato ; valvis intus albis, ad marginem fusco-rubente 

 pallide pictis, postice zonula unica obliqua notatis ; sinu 

 pallii angusto, profundissimo, leviter arcuato, lateribus suis 

 parallelis, apice obtuso. 



Glauconome rostralis, Desh. Proc. Zool. Soc. 1853. 



Hab. Borneo. Coll. Cuming. 



Fam. 4. PetiicoladaB. 



Animal ovato-transversum, antiee incrassatum, postice attenu- 

 atum. Pallium tenue, in margine duplicatum, in marginibus 

 valvarum reflexum, antiee fissura brevi perforatum, tracheis binis 

 inaequalibus postice terminatum ; tracheis usque ad basin sepa- 

 ratis. Trachea branchialis major, cylindracea, tentaeulis arbores- 

 centibus inaequalibus alternatis coronata ; trachea analis conica, 

 valvula membranacea terminata et tentaeulis simplicibus in mar- 

 gine ordinatis munita. Pes minimus, compressus, elongato-eoni- 

 cus; appendices labiales minimae, triangulares. Branchife in- 

 sequales, ovato-quadrangulares, oblique plicatse. 



Testa ovato-transversa, tenuis, tumida, insequilateralis, ajqui- 

 valvis, utraque extremitate hians. Cardo angustus, in utraque 

 valva bidentatus ; dentes infequales, majore bifido ; impressiones 

 musculares insequales, antica ovata, submarginalis, postica cir- 



