226 



100. HippONYX Grayanus, Mke. Proc. Zool. Soc. 1856, p. 4 ; 

 B.M. Maz. Cat. no. 350. p. 299. 



Hab. California, rarissime. Mus. Nuttall. 



101. Spiroglyphus , sp. ind. 



Hab. Sta. Barbara, Crepidulam aculeatam erodente. Sp. jun. in 

 Mus. Nuttall. 



102. AlETES* SaUAMIGERTJS, n. s. 



A. t. majore, fiavido-albida, solute spirali, plerumque glomerata ; 

 superficie costis spiralibus, sųuamis instructis ; costulis phiribus 

 intercalantibus, squamuhs minoribus ; sąuamis et sųuamulis im- 

 bricatis, arcuatis ; interdum aperturam versus sculptura obso- 

 lėta. 

 Hab. Sta. Barbara. Sp. magn. glomer. in Mus. Nuttall; San 

 Diego, Mus. Gould. 



A fine group of this shell is in Mr. Nuttall's collection. It agrees 

 in the main with the Mazatlan species, but differs in colour and 

 sculpture. Mr. Nuttall believes that he found another species with- 

 out scales. 



103. Petaloconchus macrophragma, n. s., B.M. Maz. Cat. 

 no. 359. p. 309 ; et Monogr. Petaloconchorum (Proc. Z. S. postea). 



Hab. San Diego, Euraphice Hembeli adhserens. Mus. Nuttall. 



Of the remarkable Cirripedi to which this shell is attached, only 

 two specimens were found by Mr. Nuttall, and described by Conr. 

 Journ. p. 261. pi. 20. f. 13. 



104. Cerithidea sacrata, Gould. 



Cerithium (Potatnis) sacratum, Gould, Exp. Shells, p. 60. 

 = Pirena Californica, Nutt. MS. 



Hab. Monterey, Sta. Barbara, &c., aąuis mixtis. Mus. Nutt., 

 Brit. 



— 105. Litorina planaxis, Phil. 



= Littorina tenebrata, Gould. 

 Hab. California. Mus. Nutt., Brit. 



* The genus Siphonium is thus characterized and divided in the B.M. Maz. 

 Cat. p. 301. 



Genus Sifhonium, Bronne. 

 Testą valde irrecularis, juniore haud turritelloidea. Operculum terme, con- 

 cavum, simplex. 



A. Species typici. Operculo valde concavo, vix spirali. 

 Oceanis Indico et Atlantico repertae. 



B. Subgenus Aletes (aXįr»/s, errator). Operculo parnm concavo, multispi- 

 rali,fere ut in Turritella/or»ja<o. 



For further information on the opercula of Fermetidce, v. B.M. Maz. Cat. 

 pp. 300-312. 



