191 



postico corrugatis ; dentibus cardinalibus pyramidatis, lateralibus flex- 

 uosis: inipressionibus musculorum profundis ; margarita albido-incar- 

 nata. Long-. 2 ; alt. 1^ ; lat. ± poll. 



Closely allied to U. corrugata Lam., which is less rounded and less 

 corrugated. 



Unio crispata. T. ovali-elongata, inequilaterali, antice rotun- 

 data, postice subrostrata, costaque umbonali instruct;! ; umbonibus 

 parvis ; colore virescente, fusco variegata; rugis angulatis radiantibus 

 undique crispata: intus livid.il ; dentibus parvis obtusis. Long. l-j^; 

 alt. T 9 ^ ; lat. \ poll. 



Unio foliacea. T. parva, compressa, fragili, fusco-vii'escente, 

 inequilaterali, transverse oblongo-ovata, postice sub-angulata ; umbo- 

 nibus parvis, subtilissime corrugatis ; dentibus exilibus, rectis, ad mar- 

 ginem parallelis ; margarita livida, iridescente. Long. 1^ ; lat. \ ; 

 alt. T \ poll. 



Closely allied to U. Bengalensis and Corrianus Lea. 



Unio exolescens. T. transverso-oblongata, inequilaterali, sub- 

 compressa, fusco-virescente ; postice dilatata, sub-biangidata ; umbo- 

 nibus sub-elevatis ; dentibus cardinalibus parvis, obliquis, interdum 

 exoletis ; lateralibus remotis, rectis ; margarita livida vel ferruginea. 

 Long. 2| ; alt. 1^ ; lat. f poll. 



In form and color resembles some stinted varieties of U. complanatus. 



Paltjdina doliaris. T. tenui, conico-globosa, luteo-viridescente, 

 arctissime umbilicata ; anfract. 5 ventricosis, striis minutissimis reticu- 

 latis, costulis numerosis inequalibus, purpureis, cinctis ; apertura sub- 

 circulari ; columella reflexa, non appressa, alba ; labiis postice dis- 

 junctis. Long. 11 ; lat. -fo poll. 



Differs from P. Burroughiana and elongate in form and aperture ; 

 but is nearly allied to P. subcoslata, Griffith's Cuvier. 



Paltjdina petrosa. T. solida, imperforata, subglobosa, apice 

 erosa, saturate viridi, rufo fasciata ; anfract. 3, ultimo amplo, sutura 

 praecipue marginata ; apertura semi-circulari, columella late planulata, 

 rufescente ; intus nigrescente vel holosericea ; operculi apice subcen- 

 trali, elementis concentricis. 



Resembles Anculotus or Littorina, but its place is determined by 

 the operculum. 



Melania batana. T. turrita, solida, fusco-virescente, apice 

 erosa, anfract. 6-7, planulatis, postice sub-coronatis, costulis longi- 

 tudinalibus et volventibus gemmularum series tres efformantibus ; 

 apertura angusto-ovata, postice coronata, intus caerulescente, columella 

 alba. Long. 1 ; lat. -| poll. 



Very closely resembles il/. Hydeii Conrad. 



Modiola varicosa. T. fragili, lucida, inequilaterali, transverse 



