22 
obsolete striata, epidermide viridi, tenue striata induta, striis 
ad margines et postice laminoso-crispis ; umbonibus magnis, 
acutis, revolutis, oppositis, violaceis; latere antico breviore, 
late semicirculari, postico attenuato, conico, rostrato, acumi- 
nato; area plana, angulo obtusissimo cireumscripta ; cardine 
angustissimo, dentibus tribus primariis minimis, approximatis, 
subequalibus, divergentibus, mediano profunde fisso ; dentibus 
lateralibus subequalibus, distantibus, compressis, laminatis, in 
valva dextra duplicatis, antico suleo profundo margine sepa- 
rato. 
Long. 50 mill., alt. 40, lat. 34. 
Hab. Bay of Caraccas ; Peru. 
37. CyrEeNna (ANoMALA) Cumrnet. C. testa ovato-subtrigona, 
inequilaterali, tumida, cordiformi, satis solida, transversim 
inequaliter tenuissime striata, epidermide fusco-virescente, in- 
Serne lamellosa vestita ; umbonibus magnis, prominentibus, 
oppositis, decorticatis, approximatis ; latere antico brevi, late 
rotundato, postico attenuato, superne declivi, eatremitate trun- 
cato, angulo obtuso, decurrente circumscripto ; ecardine an- 
gusto, in medio paulo latiore; dentibus tribus primariis in- 
equalibus, approximatis, angustis, apice profunde bifidis, late- 
ralibus magnis, equidistantibus, antico paulo majore, conico, 
acuto ; valvis intus candidissimis. 
Long. 60 mill., alt. 52, lat. 44. 
Hab. Central America. 
38. Cyrena (ANomALA) IsocarpiorpEs. C. testa orbiculato- 
subtrigona, inequilaterali, turgida, cordiformi, tenui, fragili, 
tenuissime transversim inequaliter striata, epidermide olivacea, 
nigro-conulata vestita ; umbonibus magnis, subinvolutis, oppo- 
sitis, atro-violaceis ; latere antico regulariter late semicirculari, 
postico superne declivi, attenuato, subrostrato ; area plana, 
ovato-lanceolata, angulo lato, obtuso, decurrente circumscripta ; 
cardine angustissimo, dentibus primariis tribus minutissimis, 
approximatis, subequalibus, duobus anticis parallelis, postico 
divaricato; dentibus lateralibus minimis, subequidistantibus, 
margine sulco angusto, profundo separatis, in valva dextra du- 
plicatis; pallii impressione margine inferiore proxima ; valvis 
intus albis, utroque latere violaceo maculatis. 
Long. 54 mill., alt. 53, lat. 41. 
Hab. Columbia. 
39. CyrenA (ANOMALA) ANGULATA. C. festa trigona, turgi- 
dula, equilaterali, solidula, laevigata, epidermide squalide fus- 
cescente vestita; umbonibus minimis, depressis, oppositis, la- 
tere antico atque postico equaliter conveaiusculis et declivi- 
bus ; latere antico obtuso, subangulato, postico angulato, sub- 
rostrato ; margine inferiore ventricoso ; cardine angusto, den- 
tibus primariis tribus minimis, angustis, duobus majoribus 
apice profunde fissis ; dentibus lateralibus inequalibus, com- 
