46 



, Tetrodon strigosus. Tetr. dorso hispido, nigrescente ; ventre 

 laterihusąue lavibus, his alho nigroque longitudinaliter Uneatis, 

 illo albo : pinnd caudali guadratd; pectoralibus late rotundatis. 

 D. 12. A. 9. P. 19. C. 8. 



Tetr. lineato, Linn., ( Tetr. Physa, Geoff.,) analogus videtur. Dif- 

 fert inaxiin^ ventre lateribusque haud armatis. 



The exhibition was resunoed of the new species of Shells collected 

 by Mr. Cuming on the vvestem coast of South America and among 

 the islands of the South Pacific Ocean. Those brought on the pre- 

 sent evening under the notice of the Society were accompanied by 

 characters by Mr. G. B. Sowerby. They belonged to the 



Genus Petricola. 



Petricola kluptica. Pet. testd ovato-elUpticd, rufescenli-albidd ; 

 radiatim costatd, posiici lavi ; lamellis concentricis sparsis ; lu- 

 nuld anlicd distinctd : long. 1'2, lat.OJ, alt. 0'9 poli, 



Hab. ad Paytam. 



Found in hard mud at low water. — G. B. S. 



Petricola oblonga. Pet. testd ohlongo-ellipticd, pallescente ; 

 radiatim costellutd ; Uned dorsali posticd rectiusculd ; lamellis 

 concentricis pluribus, postici lavigatis : long. 0"9, lat. O'o, alt. 

 0-7 poli. 



Hab. ad oras Peruviae. (Pacosmayo.) 



Found in hard mud at lovv water. — G. B. S. 



Petricola solida. Pet. testd suhglohoso-ellipticd , pallescente, 

 umbonibus extremitatibusque ambabus fusco-violaceis ; radiatim 

 costatd, postic'b Icevigatd ; lineis incrementi nonnunąuam subla- 

 mellosis, posticl magis eminentibus : long. 1*3, lat. 0*8, alt. 

 1-0 poli. 

 Hab. ad oras Peruviae. (Lambeyeque.) 

 Found in hard clay and stones at lo\v water. — G. B. S. 



Petricola discobs. Pet. testd oblongo-ellipticd, brunnescente ; ra- 

 diatim costellatd, costeUisacutis, postice leevi ; Uned dorsali rectd : 

 long. 0-8, lat. 0'3, alt. 0-55 poli. 



Hab. ad littora Peruviae. (Lambeyeąue.) 



Found in hard clay. — G. B. S. 



Petricola concinna. Pet. testd oblonga, pholadiformi, albicante ; 

 concentrice costellatd; antice rotundatd, radiatim sutcatd ; dorso 

 declivi, allerius valvcB lamelld Icevigatd ; postici acuminatiusculd, 

 colesllis concentricis lamellosis, confertis: long. 0'8, lat. 0-35, 

 alt. 0-35 poli. 



Hab. ad Montem Christi. 



Only one perfect pair and a single valve could be preserved. 



Found in hard clay at low water. — G. B. S. 



Petricola denticulata. Pet. testd oblongd, pholadiformi, ei- 

 tus pallescente, intils ad extremitates fusco-nigricante tinctd; 

 antice subroslratd, posiici rotundatd į Uned dorsali recliuscttla, 



