80 PROCEEDINGS OP THE ACADEMY OP 



Descriptions of new species of Cyrena and Corbicula in the Cabinet of the 

 Academy of Natural Sciences of Philadelphia. 



BY TEMPLE PRIME. 



1. Cyrena ponderosa Prime. C. testa subtrigona, inaequilaterali, trans- 

 versini irregulariter striata, epidermide brunnea vestita, valvis crassis, solidis ; 

 intus candidissirna ; nmbonibus parvis, obliquis, erosis ; dentibus cardinalibus 

 tribus ; dente laterali postico compresso, antico breviore, acuto. 



Shell somewhat triangular, inequilateral, lines of growth irregular, epidermis 

 brown, valves heavy ; interior white ; umbones small oblique, eroded ; three 

 cardinal teeth ; posterior lateral tooth compressed, anterior one short and 

 prominent. 



Long. 1 4-5 ; lat. 1 3-5 ; diam. 1 2-5 poll. 



Hab. Philippine Islands. 



This shell is remarkable by its weight in proportion to its size. It may be 

 compared to the Cyrena Bengalensis Lamarck, from which it differs, how- 

 ever, in being heavier, having less prominent beaks, and by being slightly 

 more inflated ; its epidermis is darker and more heavily sulcated. 



2. Cyrena Corbiculaeformis Prime. C. testa trigona, sub-inflata, in- 

 aequilaterali, intus violacea, epidermide brunnea vestita, umbonibus tumidis ; 

 dentibus cardinalibus tribus, inaequalibus ; lateralibus praelougis. 



Shell triangular, somewhat inflated, inequilateral, beaks prominent, pos- 

 terior margin angular, three cardinal teeth, the two posterior ones of nearly 

 the same size, anterior one less developed ; lateral teeth elongated, not promi- 

 nent ; interior of the valves bluish-white ; epidermis glassy, lines dark brown. 



Long. 1 3-10 ; lat. 1 2-10 ; diam. 7-10 poll. 



Hab. Cochin in Malabar. 



This species is different from any Cyrena known to me, but bears much re- 

 semblance in its general forrn to certain species of Corbicula. 



3. Corbicula r o t u n d a Prime. C. testa parva, orbiculata, subaequilaterali, 

 tumidula, subtrigona, solidiuscula, epidermide flavescente vestita ; regulariter 

 striata ; umbonibus tumidis ; intus alba ; dentibus cardinalibus inaequalibus ; 

 lateralibus elongatis, angustis, subaequalibus, arcuatis, tenuissime striatis. 



Shell small, somewhat inflated, nearly equilateral, interior white, epidermis 

 yellow, lines of growth delicate and very regular ; umbones prominent ; car- 

 dinal teeth unequal in size ; lateral teeth elongated, carved, finely denticulated. 



Long. 7-10 ; lat. 6-10 ; diam. 6-10 ; poll. 



Hab. Surinam River, Guyana. 



Compared to the Corbicula Paranensis Adams, this species differs in being 

 more inflated, in having larger beaks and by its more regular lines of growth, 

 which give it somewhat the appearance of an Eastern species. 



The Humming Birds of Mexico. 



BY RAFAEL MONTES DE OCA. 



Of Jalapa, Mexico. 



No. 2. 



Cyanomyia cyanocephala Gould. 

 Ornismyia cyanocephala Lesson. 

 Trochilus quadricolor Vieillot? 

 The Black billed Azure-crown, Gould, Monograph, part xi. 



This Humming Bird is commonly knowu by the name of Chupa-mirto, comun 

 depecho bianco, or common white-breasted Myrtle-sucker. It is found very 



[Feb. 



