OF CONCHOLOGY. 265 



broader. Anal papilla small, resembling thut o^ Lotti a ; infra- 

 anal papilla broader, bifid ; renal orifice small, subcircular, not 



elevated, some distance to the left of the anal. Formula 







1 (2—1 • 1— ^T'l* 



The shell has been well described by Menke and by Dr. Car- 

 penter in the Mazatlan Catalogue, with copious synonymy. 

 From the latter, however, Ac7n(ea pe7^so7ioides, Mid., should be 

 eliminated, as it came from Cook's Inlet where S. mesoleuca is 

 unknown. The former is probably only a variety of patina. 



The range of this species is from Central America to Lower 

 California. It is plenty in the Gulf, and I collected several 

 hundred specimens at San Juan del Sud in Nicaragua, in the 

 course of half an hour. It inhabits the rocks between tide 

 marks. 



Family PATELLID^. 



PateUina, McGillivray, Moll. Aberdeen p. 66, 1843. 



< Patellidce, Woodw., Man. p. 153. Cpr., Rep. Br. Assoc. 



1856, p. 318. Jeffreys Brit. Conch, iii, p. 229 (in Pec- 

 tinibranchiata !) Binn. Inv., Mass. Ed. ii, p. 267. 

 D'Orb., Moll. Can. 1837. 



< Fatelloidea, Risso, Hist, iv, p. 260, 1826. (Not Fer., Rang 



or Mke.) 



< FateUina, Wiegm., Handb. der Zool. p. 546, 1832. Milne- 



Edwards, Conch. Textb. Ed. vi, p. 197. 

 <C Patellar, Fer., Tab. Syst. p. xxxvii, 1821. Rang, Man. p. 

 251, 1829. Desh.", Enc. Meth. iii, 1830. 



< Fatellacea, Mke., Syn. Ed. ii, p. 90, 1830. Forbes, Mai. 



Monensis, p. 35, 1838. 



< Fatellacea', Menke, Syn. 1828, olim. Hinds, Voy. Sulph. 



Zool. p. 53. 



< Fatelladoi, Guild., Zool. Journ. iii, p. 535, 1828. 



< Fhyllidiana, Lam., Phil. Zool. 1809. Gld., Inv. Mass. Ed. 



i, p. 146. 

 > Fatellidoi, Gray, Guide Moll. p. 173. Chenu, Man. de Con- 

 chy!, i, p. 376. 

 Fatellidai, Cpr., Maz. Shells, p.' 199. H. and A. Ad., Gen. 

 Rec. Moll, i, p. 463. Cpr., Sm. Rep. 1860, p. 219. 

 Lect., Moll. 2d ed. p. 71. D'Orb., Voy. Am. Mer. v, p. 

 480, 1842. 



Animal destitute of a cervical branchia but provided with a 

 more or less complete cordon of branchiae in the form of laminae 

 attached to the mantle between its thickened edge and the sides 

 of the foot. Radula provided with three lateral teeth on each 



