PHYLLIDIANA. MOLLUSCA. LOTTIA. 153 



Shell small, conical, white, oval, having numerous minute 

 radiating ribs, traversed by equally fine concentric lines, which 

 give the surface, when viewed under a magnifier, the appearance 

 of net-work ; summit nearly central, margin slightly scolloped by 

 the termination of the ribs ; interior white. Length ? 7 T inch, 

 height T \ inch, breadth J inch. 



Only three specimens of this shell are yet known. The first one 

 found was taken by Mr.Couthouy from the stomach of a fish caught 

 off Barnstable, and was described by him. A second has since 

 been found by Mr. W. W. Wheildon, of Charlestown. It is at once 

 distinguished by its checkered or granulated surface, no other spe- 

 cies, yet described, having that character. 



GENUS LOTTIA, GRAY. 



Shell basin-shaped, apex obtuse, usually more depressed and 

 thinner than Patella, and distinguished from it chiefly by its in- 

 habitant. 



LO'TTIA TESTUDINALIS. 



Shell oblong-oval, greenish-white, for the most part with 

 brownish sub-dividing radiations ; centre ivithin, dark-brown. 



FIGURE 12. 



State Coll., No. 129. Soc. Cab., No. 767. 



Patella testudinalis, MULLER, Prodr., p. 237. FABR.; Fauna GrcE.nl., 385. 



LAM. ; An. sans Vert., vii. 543. DILLWYN ; Catal, 1045. WOOD ; CataL, No. 



63, pi. 37. 



Patella testudinaria, KAEMMERER, Rudolst Conch., 12, pi. 2, f. 4, 5. 

 Patella testudinaria Grcenlandica, CHEMN.; Conch., x. 325, pi. 168, f. 1614, 1615. 

 Patella tessellata, MULLER ; Zool. Dan., iii. 2868, teste Dr. Beck. 

 Patella Clealandi, SOWERBY ; Records of Lin. Soc., viii. 621. FLEMING j Brit. 



Jlnim.,287. 



Patella virginea, MULLER; Zool. Dan., iii. 2867. 

 Patella virginea ? GMELIN. ; 3711. DILLWYN; CataL, 1052. 

 Patella amce^na, SAY ; Journ. dead. Nat. Sc. t ii. 223. 

 Patelloidea amceW, COUTHOUY ; Bost. Journ. Nat. Hist., ii. 171. 

 Patelloida testudinalis, LEA ; Trans. Am&r. Phil. Soc., (New Series,) vii. 73. 

 Patella cly'peus, BROWN; Conch, of Great Brit., &c., pi. 37, f. 9, 10. 

 Lottia Antillurum, SOWERBY ; Conchol. Manual, f. 231. 



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