ON MOLLUSCA Or THE WEST COAST OF NOETH AMEKICA. 527 



brief diagnosis. The name should therefore be dropped. The shell, pi. 19, 

 fig. 15 {not 16)=CMone simillima, Sby., no. 89 ; a good Lower Oalifornian 

 species. It seems that the error was not in numbering of the figures, as 

 Mr. Nuttall supposed, but in Conrad's identification of Broderip's species]. 



40. Chione excuvata [is closely related to Ch. succincta ; the unique type, however, 

 in Brit. Mus. displays characteristic diflerences of sculpture. It is singu- 

 larly like the W. Indian Ch. cancellata, and may prove exotic]. 



'H.Cypncard'ia Californica [=C. Ouiniaca, \jS.m.,^C. JJwperryi, Desn. Almost 

 certainly from the Sandwich Is.]. 



45, 45 J. Cardmm Californianvm \_=C. Nuttallii, var. The species is named " C, 



corbis, Mai't.," by Desh. MS. in Mus. Brit, and Cuming']. 



46. Cardium qiiadragenarium [= C. luteolahrum, Gld.]. 

 51. «. antea, no. 32. 



56. Modiola recta. [Described from very yoimg specimens. The broad form h 

 M.Jlabellata, Gld.] 



69. Mytilus bifurcatus. [The type is lost ; the figure and description would suit 

 many species. It is allocated, in Mus. Cum., to thg Oalifornian Septifer \ 

 but by Pease to a Sandwich Island Mytilm.'] 



CO. [None of Conrad's species of Isogn-tnon have been confirmed as from Califor- 

 nia. They are known to inhabit the Pacific Islands.] 



626. [Mr. NuttaU also brought an oyster, which he named in MS. O. latecaudata, 

 = O. lurida, var. ; and Hinnites giganteus, Gva,j, = J£. Poulsoni, Conr.] 



64. [Dr. Gould states that H. Nicklitiifna, Lea, = J?. CaUforniensis, Pfr., Chemn., 

 Rve. ; but that H. Californiensi:., Lea, is distinct.] 



69. Helix Totimsendiana [ = ^. (sruginosa, Gld. MS.]. 



74. Chiton Nuttallii [is an Ischnocliitoti]. 



75. Chiton aadus [is an aberrant form of Mopalia. " Cliiton consimilis" Nutt. MS. 



in Brit. Mus., appears to be Mopalia Hindsii, var. " Chiton Californicm " 



Nutt. MS., = " Acanthopleura " scabra, Rve.]. 

 77. Patella mamillata, Nutt. [(non Esch.) is now assigned in Mus. Cuming to 



Acmaa scabra, Nutt., var. limatula'\, 

 S3. Fissurella ornata, Nutt. [=i''. volcano, Rve.]. 



84. Glyphis densiclathrata, Rve. [V. anted,, p. 522. The shell has been lost.] 

 86. H. CaUforniensis, Swains, [(not Californiana, Y !>X., = rufescens), is a,n extreme 



var. of H. Cracherodii. The series in the Smithsonian Mus. have 5, 6, 7, 



8, and 9 holes ; as soon as it has 10 and 11, it passes into CaUforniensis, 



which was figured in 1821 with 9 holes. When these are numerous, they 



are generally small in proportion]. 



91. Calliostoma doliarium [= C canaUculatum, Mart. This and C. annulatiim, 



Mart., are quite distinct from C.filosum, which= C. costaium, Mart.]. 



92. Omphaliics atei- [is the S. American species. The common CaLfornian shell is] 

 94. O. marginatus, Nutt. MS. \_=funebraUs, A. Ad.]. 



97J. The collection contains one specimen of Orepidula dorsata. 

 103. [Is a Serpulorbis, without operc, teste Cooper.] 



106. Litorina tenebrata [should be patida, Gld. (non Jefir.). Nuttall's MS. name 



was published by PhU. in 1845]. 



107. Natica ?maroccana, var, Californica. [The varietal name must be dropped. 



The shell certainly came from the Sandwich Islands.] 

 T 108. [The shell is Vitularia salebrosa, jun., and not] Ranella triquetra. 



109. Mitra maura [Swains., teste Rve. (?ubi)=ifcf. orientalis. Gray, =M. " Chi- 



lensis," Baen.J. 



110. Olivella glandinaria, Nutt. [ = 0. biplicata. Shy.]. 



112, 113. Purpura aperta and P. harpa fare certainly from the Sandwich Islands]. 

 114. Purpura emarginata [was described by Desh. from an immature specimen in 



which a half-formed knob caused an "emargination." The adult is one 



very extreme form ; P. ostrina, Gld., is another ; F. fuscata, Fbs., is a third. 



The normal condition is P. lapillus. Cooper (non Linn.), =sa^8Cofa, Val. 



Mr. Nuttall's collection also contains] P. crispata, var. 

 116. Monoceros brevidens [is an accidentally short-toothed form of M. lapilloidesl. 

 lis. Cerostoma Nuttallii [with C.foUatum and C. monoceros, Shy., belongs to Pur- 



puridis]. 



