233 



Nr- 49. Cyrena conjuncta Deshayes- 



Cyrena conjuncta Desh., 1854. Proc. Zool. London XXII. p. 18. 



— — Prime, 1869—70. Catal. Corb. Gen. Cyrena Nr. 16. 



T. orbiculato-trigona, crassa, solida, ventricosa, subaequilaterali, utraque 

 latere obtusa, rotundata, inferne regulariter arcuata, margine antico supe- 

 riori declivi, rectilineo; postico convexo; epidermide viridi - fuscescente. trans- 

 versim regulariter tenue lamellosa vestita; umbonibus tumidis, obliquis, bre- 

 vibus, obtusis, erosis; ligamento brevi, angusto, immerso; valvis intus albis; 

 dentibus cardinalibus tribus, inaequalibus , postico valvae dextrae latiore, 

 inaequaliter bifido, mediano eminentiore , acuto, profunde bilobato; dentibus 

 lateralibus parvis, distantibus, antico eminentiore, conico, compresso. 



Hab.? fDesh.j. 



Nr. 50. Cyrena Cumingii Deshayes- 



Cyrena Cumingii Desh., 1854. Proc. Zool. London XII. p. 22. 



— — Prime, 1864. Catal. Corb. p. 6 und 1869 70. Gen. Cyrena 



Nr. 18. 



T. ovato-subtrigona, inaequilaterali , tumida, corditormi, satis .solida, 

 transversim inaequaliter tenuissime striata, epidermide fusco - virescente , in- 

 ferne lamellosa vestita; umbonibus magnis, prominentibus, oppositis, decor- 

 ticatis; approximatis ; latere antico brevi, late rotundato, postico attenuato; 

 superne declivi, extremitate truncato, angulo obtuso decurrente circumscripta ; 

 cardine angusto, in medio paulo latiore; dentibus tribus primariis inaequali- 

 bus, approximatis, angustis, apice profunde bifiidis; lateralibus magnis, 

 aequidistantibus, antico paulo majore, conico, acuto; valvis intus candi- 

 dissimis. 



Long. 60, lat. 52, er. 44 Mm. 



Hab. America centralis. (Desh.). 



Nr. 51. Cyrena decipiens Deshayes. 



Cyrena decipiens Desh, 1854. Proc. Zool. London XXII. p. 17. 



— — Prime, 1869—70. Catal. Corb. Gen. Cyrena Nr. 21. 



T. ovato-subtrigona, tumida, inaequilaterali, parum crassa, epidermide 



viridi, lamellis transversis distantibus, crispis instructa vestita; lamellis po- 



stice multo numerioribus , appressis, erectis; umbonibus minimis, decortica- 



tis, vix obliquis; latere antico breviore, superne convexiusculo , declivi; in- 



IX. 3. 30 



