^l APPENDIX. 



79-1. FISSUIIELLA APERTA. 



F. testri ovata, cariica, fusco-railiatA, inargiiic inte- 

 i>ra, alba, dcpress.l; foramiue ovato, luagno ; long. 

 1 line. lat. 5 uuc. 



Ohs. Tliere are two specimens of tliis shell, 

 wliii'li is easily distinguished by its large ovate, en- 

 tire foramen, independently of the de])ressed white 

 margin, wiiich is probably caused by the mantle of 

 the animal overlapping the edge of the shell. 



79:). FISSURELLA CLYPEIFORMIS. 



F. test;\ ovato-oblongA, deprcssiusculA, IepvI, extus 

 fiisca; foramina elongato, intus integro, extus la- 

 teribus coarctatis, utrinque unidentatis ; niargine 

 iindulata ; infra albida : long. 2,',^ unc. lat. 1 ,V 

 line. 



706. FISSURELLA CRENULATA. 



F. testa oblongo-ovata, depress;!, albli; foramine ova- 

 to, integro ; superfieie striis confertis, radianti- 

 bus, decussatis; margine crenulata; long. 3^ unc. 

 lat. 2^ unc. 



Obs. Besides these three undescribed species 

 there are the six following, viz. Nos. 797 to 802, which 

 do not appear to be mentioned by Lamarck, yet we 

 have not ventured to describe them, on account of 

 the extreme difficulty of ascertaining whether or not 

 they arc already noticed. 



808. SIPHONARIA GICAS. 



S. testa suborl)icnlari, conicft, radiatim carinato- 

 costata, costis distantibns; vertioe recto, centrali : 

 long. '2,V line- Int. 2 imc. 



Obs. Tliis is the largest species of llie genus we 



have <ecu; from Panama. 



