2 



10 



9 



2 



11 



9 



2 



11 



9 



3 



16 



15 



3 



17 



15 



3 



18 



15 



4 



14 



19 



4 



15 



19 



4 



15 



19 



4 



16 



19 



4 



16 



19 



4 



17 



19 



5 



16 





5 



18 



23 



ON MOLLUSCA OF THE WEST COAST OP NORTH AMERICA. 173 



our present inquiry. The descriptions are in Latin, the localities accurately- 

 recorded, and the work illustrated with plates which are tolerably charac- 

 teristic. 



Part. Page. Plate. Fig. 



2 10 9 1. Murex monodon, Esch. Siteha. = M.foMatus, Grael. teste Rve. 

 z=M. tripterus, Lam. teste Sow. =M. alata, Chemn. teste Sow. 



2. Murex ferrugineus, Esch. Siteha. = M. lactuca, var. (Midd.). 



3. Murex lactuca, Esch. Siteha. 



4. Murex multicostatus,~E$c\i. Siteha. =Trophon clathratus, Linn, 

 teste Midd. 



1. Pleuropus pellucidus, Esch. South Sea (Pacific), near Equator. 



5. Creseis cornucopia, Esch. South Sea, near the "niedern Inseln." 



6. Creseis caligula, Esch. South Sea, near Equator. 



1. Eolidia pinnata, Esch. Siteha. 



2. Cavolina crassicornis, Esch. Siteha. 



3. Cavolina subrosacea, Esch. Siteha, on Fuci. 



4. Glaucus Pacificus, Esch. Intertropical Pacific. 



5. Glaucus draco, Esch. Equatorial Pacific. 



6. Phylliroe Lichtensteinii, Esch. Pacific, west of Sandwich Islands. 

 Acmcea. Animal and shell described. 



4. Acmcea mitra, Esch. = Patella scurra, Less. = Scurria mitra, 



Gray, Gen. =1 Lottia pallida, Gray, Zool. Beech. Voy. Siteha. 



This shell is very abundant on the coasts of Chili (Cuming), 



and is also common near Monterey (Nuttall), but is not found 



in tropical America. 

 5 18 Acmcea mammillata, Esch. Siteha. = Scurria mitra, var. teste 



Phil., Midd. 



5 19 Acmcea marmorea, Esch. Siteha. = Scurria mitra, var. teste Midd. 



5 19 24 3. Acmcea jcassis, Esch. Siteha. The northern analogue of P. 



deaurata, Gmel., from the Magellan Straits. Probably = P. 



exarata, (Nutt. MS.) Rve. Conch. Ic. pi. 19. sp. 47 : var. pi. 24. 



f. 62 a, b. Oregon, Lieut. Baskerville. ? =P. Mazatlandica, 



Gray. 

 5 19 Acmcea pelta, Esch. Siteha. = P. leucophcea, (Nutt. MS.) Rve. 



Conch. Ic. 34. 101. 4- P. monticola, Nutt. MS. (= P. monticolor, 



Jay, Cat. 2844)-fP. strigillata, (Nutt. MS.) Jay, Cat. 2881. 

 5 19 23 1-3. Acmcea scutum, Esch. Siteha. (Chili, Bolivia, Peru, D'Orb.), 



= A. patina, var. teste Phil., Midd. 

 5 19 24 7, 8. A cmcea patina, Esch. Siteha. =P. mammillata (Nutt. MS. non 



Esch.), Rve. Conch. Ic. 42. 140. + P. tessellata, (Nutt. MS.) 



Jay's Cat. 2885. + P. fenestrata, (Nutt. MS.) Rve. C. I. 38. 121. 



+ P. verriculata, Rve. C. I. 31. 87. California. + P. cinis, Rve. 



C. I. 24. 60. Monterey, Hartweg. ?-f-P. Nuttalliana, Rve. C. I. 



30. 81. Oregon. +P. Cumingii, Rve. C. I. 16. 37. Valparaiso, 



Cuming, teste Rve. : " never took it," Cuming, teste seipso. 



Monterey, Hartweg, teste Mus. Cuming. ?-f P. diaphana (Nutt. 



MS.) Jay, Cat. 28. 3, non Rve. + Lottia pintadina, pars, Gould, 



Exp. Sp*. p. 9 : v. B.M. Maz. Cat. p. 207. no. 265.* 



* The above extensive citation of synonyms is the result of (1) the study of Eschscholtz's 

 diagnoses: — (2) The judgment of them by Philippi, after seeing the types, as recorded in 

 Zeit.f. Mai. 1 846,p. 106-8 :— (3) The fully recorded judgment of Middendorffin the Mai. Ross. 

 and Sib, Reise, in locis : — (4) The careful and repeated examination of Mr. Nuttall's shells, 

 (a) in his own collection, aided by his recollection, and with the full concurrence of his judgment; 

 {b) in Dr. Jay's catalogue; (c) in Mr. Cuming's collection, as received from Nuttall, through 

 •Jay, and figured by Reeve : — (5) The comparison with these of Dr. Gould's specimens, col- 

 lected on the same coast by the officers of the United States' Exploring Expedition and of the 

 Mexican war: — (6) The examination of the types of Mr. Reeve's species in the Cumingian 

 collection : — (7) The interpretation of all the above by the experience derived from the 

 repeated and most careful examination of many thousand (at least 15,000) Limpets in the 

 Mazatlan collection. It is offered as an approximation to the truth. It is a subject of great 



