35 



latere antico ultiore, rotundato ; postico subacumimto, in/rH co- 

 arctato, margine dorsali declivi } lamellis con/ertis : long. 0-6, 

 lat. 0-3, alt. 0-4 poli. 



Hab. ad Sinum Caraccensem. 



Dredged from a sandy muddy bottom in seven fathoms -vvater in 

 the Bay of Caraccas. — G. B. S. 



CuMiNGiA TRiGONULARis. CuM. testd orhiculūto-suhtrigond, con- 

 centrice lamellosd ; latere antico rotundato, j)ostico acuminato, 

 margine dorsali declivi: long. 0'8, lat. 0-4, alt. 0-7 poli. 



Hab. ad Sanctam Elenam. 



Found among stones in deep water. — G. B. S. 



Genus Corbula. 

 CoRBULA NuciFORMis. Corb. tcstd ovatd, crassd, ventricosd, antici 

 rotundato, postice rostratd, obtusd; margine ventrali valvce sinis- 

 tralispostici coarctatd, transversim sulcatd: long. 0*55, lat.O'Zb, 

 alt. 0-3 poli. 

 Hab. in America Centrali. 



Found at a depth of six fathoms in sandy mud at Real Liejos, 

 The šame species is also found in a fossil statė near Guayaquil. — 

 G. B. S. 



CoRBULA BiCARiNATA. Corb. tcstd ovatd, depressiusculd, subaqui- 

 laterali, antice paullu longiore, postice bicarinatd ; carinis ex um- 

 bone ad marginėm posticam ventralem decurrente : long. 0'45, 

 lat. 0-3, alt. 0-35 poli. 

 Hab. ad littora Columbise Occidentalis. 



Found in sandy mud at firom seven to seventeen fathoms at Pa- 

 nama, Real Liejos, Caraccas and St. Elena. — G, B. S. 



CoRBULA BiBADiATA. Corb. testd ovato-oMongd, longitudinaliter 

 striatd, pallidd ; margine dorsali posticd subcarinatd, rufd, anticd 

 breviore, rufo maculatd ; radiis binis intermediis albis : long. O" 6, 

 lat. 0-3, alt. 0-4 poli. 

 Hab. ad Chiriąui et ad sinum Caraccensem. 



Found in mud and sand in from three to six fathoms at Chiriąui, 

 and in seven fathoms in the Bay of Caraccas. The species varies 

 much in thickness and in the colour of the inside, \vhere some spe- 

 cimens are of a darkblood red colour. — G. B. S. 



CoRBULA NASUTA. Corb. tsstd ovatd, gibbosd, antice altiore, ro- 

 tvndatd, postice rostratd, acuminatd, valvis subcarinatis : long. 

 0-7, lat. 0-35, alt. 0-35 poli. 

 Hab. ad Xipixapi. 



Found in sandy mud at a depth of ten fathoms. Some small spe- 

 cimens which I suppose to be the young of this species \vere found 

 in the gulf of Nocoiyo. — G. B. S. 



CoRBULA ovuLATA. Corb. testd ovatd, albicante, interdum roseo 

 tinctd, antice subproducto-rotundatd, postice subrostratd ; cxtus 

 longitudinaliter sulcatd: long. 1% lat. 05 , alt. O' 55 poli. 

 c2 



