227 



Legit Tottcn iii liltoiibus ad Provincetown ct Capc 

 Cod in Massachusctts ct ad Rhode insulam; deinde in portu 

 NcAvpoil. quoquc rcpcrta cst. 



Sjllimau Americau journal. Vol. XXVI. et tabulae 

 fiS.2. a-d. 



FAM. II. LITHOPIIAGA Mke. 

 86. PETRICOLA Lam. (rupellaria Bellev.; irusOken.) 



1. Petricola elliplica G. B. Sowcrhy. 



P. tcsta ovalo-eliiptica, rufcsccnti-albida; radiatim co- 

 stata, posticc laevi: lamcllis concentricis sparsisj lunula an- 

 tica dislincta. 



Long. 1-2 poU., lat. 07 poll., alt. 0-9 poll. 



Lcgit H. Cuming ad Paytam. 



Proceedings. 1834. p. 46. 



2. Petiicola oblonga G. B. Sowerbi/. 



P. tcsla oblongo-clliptica, pallesccnte; radiatim costcl- 

 lata; linea dorsali postica rcctiuscula; lamcllis concentricis 

 pluribus, posticc laevigatis. 



Long. 0-9 polL, lat. 05 poll., alt. 0-7 poll. 



Legit II. Cuming ad oras Peruviae (Pacosmayo). 



Proceedlngs. 1834. p. 46. 



3. Petricola solida G. B. Soivcrbt/. 



P. Icsta subgloboso-elliptica, pallesccntc, umbonibus 

 extremitatibusquc ambabus fusco-violaceis; radiatim costata, 

 posticc lacvigata; lincis incrcmenti nonnmiquam sublamel- 

 losis, postice magis eminentibus. 



Long. 1-3 poll., lat. 08 poll., alt. 10 poll. 



Legit H. Cuming ad oras Peruviae (Lambcyeque). 



Proceedings. 1834. p. 46. 



4. Petricola discors G. B. Sowerby. 



P. tcsta oblongo-cUiptica, brunnesccnte; radiatlm co- 

 stcllala, costellls acutis, posticc lacvi; linca dorsali recta. 

 Long. 0-8 poll., lat. OS poll., alt. 055 poll. 

 Legit II. Cuming adlittora Pcruvlae (Lambcyeque). 



15* 



