232 Entomological Sociefy. 



CoRBULA TRiGONA. Coi'b. tcstd trigoud, IcBvigatd, jyallidd, fused, 

 vel obsolete unifasciatd, antice rotundatxt, jiostice abbreviatd, ab 

 umbonibiis angulatd ; valvce dextree margine ventrali aciitd, pro- 

 ductd ; umbonibus rectis. Long. 4| ; lat. 2 ; alt. 4 lin. 



Hob. Senegal. Cab. Cuming et Metcalfe, 



CoRBULA L^vis. Co7'b . tcstd ovuli, cEquUaterali, jiallidd, tenui, Icc- 

 vigaid, comphmatd ; valvce dextree margine ventrali actttd, pro- 

 ductd ; wnbonibus rectis, suberosis. Long. 6 ; lat. 2^ ; alt. 4 lin. 



Hab. Hong-Kong, China. Cab. Belcher et Cuming. 



Both valves are flattened towards their ventral margins in a very 

 characteristic manner. 



CoRBULA FABA. Corb. tcstd ovuH, subfequHatemli, elevatiusculd, 

 tenui, Icevigatd, jmllide fusco tri/asciatd, postice ab umbonibus 

 angtdatd ; valvcc dextree margine ventrali acutd, pi'oductd ; um- 

 bonibus rectis, fragmentis epidermide tenui indutd. Long. 5 ; 

 lat. If; alt. 2f lin. 

 Hab. St. Miguel, east coast of Luzon, Philippine Islands. Ob- 

 tained in the mud at low water. 

 Cab. Cuming. 



It is very probable that the four species last described affect situ- 

 ations where the water is brackish rather than salt ; and though they 

 retain the hinge of Corbtila, in general character they materially 

 differ from the more typical forms of the genus. 



PoTAMOMYA, J. Sowcrby. 



PoTAMOMYA NiMBOSA. Pot, tsstd ovato-trigoud, Icevigatd, antice 

 rotundatd, postice productd, angulatd ; valvis incequalibus , margine 

 ventrali acutd; umbonibus subcequalibus ; epidermide tenui, tene- 

 brosd, indutd, lineis capillaribus radiantibus ; intiis albidd. Long. 

 17; lat. 8; alt. 11 lin. 



Sowerby's Conch. Manual, f. 498, 499. 



Hab. The tributary streams of the Rio de la Plata, in the mud. 



Cab. Cuming. 



PoTAMOMYA ocREATA. Pot. tcstd valde incBquilaterali, antice abbre- 

 viatd, rotundatd, postice productd, subnasutd, ab zimbone ad mar- 

 ginem posticam angulatd ; valvd dextrd rotundatd, margine ven- 

 trali antice productd , acuta ; epidermide fused indutd; i?itils albidd 

 vel ccBi'ulescente . Long. 13 ; lat. 6 ; alt. 8 lin. 



Hab' Brazil. From freshwater streams. 



Cab. Cuming et Metcalfe. 



The younger specimens are much less inequilateral than the old. 



ENTOMOLOGICAL SOCIETY. 



At the Anniversary Meeting held on the 22nd of January, Mr. G. 

 Newport, the President, delivered an Address on the state and pro- 

 gress of Entomology, from which the following interesting observa- 

 tions are extracted : — 



There is little need that I should dwell on the importance of a 



