ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 267 



service that can be rendered to science : when carelessly wrought, as when 

 an author herds together the species of his neighbour, simply because he has 

 not been able to examine them himself, it truly makes " confusion worse con- 

 founded." For the first great requirement in a scientific writer, patient and 

 laborious accuracy, this, the last work of Prof. Adams (for he died in 1853) 

 stands in the very foremost rank. The following is an analysis of its con- 

 tents, for comparison with the fauna of the Gulf of California. It will be 

 observed that the species are arranged in alphabetical order, which may 

 sometimes prevent their affinities from being noted. The new species are 

 described in Latin, with measurements, and with an accuracy which often 

 makes it safer to identify shells from them alone, than from the showy plates 

 and loose diagnoses of some works of the greatest pretensions. 



Prof. C. B. Adams s Panama List. 



N.B. True and falsely assigned habitats are both quoted : the reader will thus judge of 

 the present state of the science. Original authorities are cited in italics. Added synonyms 

 are enclosed in brackets [ ] . 



[? = O. variabilis, var.] 

 Cyprsea arabicula, Lam. . 



Ovula avena, Sow , 



— emarginata, Sow. 



— neglecta, n. s 



— variabilis, n. s. .., 



sp. 



— cervinetta, Kien 



—exanthema, var., Hinds. 



punctulata, Gray 



[?= C. arabicula, var.] 



— pustulata, Lam 



■ radians, Lam 



C. oniscus, Wood, err. typ. 



rubescens, Gray 



sanguinea, Gray 



Erato scabriuscula, Gray ... 



= Marg. cypraola, Sow. 



=M. granum, Kien. 

 Marginella minor, n. s 



— sapotilla, Hinds 



". Mitra funic ulata, Rve. 



} lens, Wood 



J nucleola, Lam. . . . 



- 1 solitaria, n.s 



'< tristis, Brod. 



STerebra elata, Hinds... 

 * larvseformis, Hds. 



robusta, Hds. 

 specillata, Hds. 



Station. 



on small Gorgonia, l.s.* 



with 0. avena. 



onGorgoniae: coloured 



accordingly, 1. s. 



u. stones, 8-20 in. 1. n 

 u. stones, 15-20 in. l.s, 



with C. arabicula. 

 under large stones, 1. s. 



under stones, 1. w. 



Moving quickly on li- 

 quid mud, above l.w. 



under stones, 1. w. 

 under stones, 1. w. 



No. of 

 Speci- 



6 

 7 



13 

 56 



2 



7 



115 

 335 



28 

 2 



10 

 40+ 



23 

 24 

 11 ' 



1 



28 

 4 

 2 



5 

 12 



Other Localities. 



Conchagua, Cum. ; Sta. Barbara, Jewett. 

 St. Elena, Cum. 



St. Juan, Green ; Sta. Barbara, Jewett. 



Acapulco, Humb. ; Brazil, Ravenel ; St. 



Elena & Real Llej., Cum. 

 Antilles & Senegal, Kien.; Ind. Oc, Jay. 



Peru and N. Holland, Kien. 



China, Humphrey; Acapulco, Humb, 



Isl. Plata, Cum. 

 Adriatic,Wood; Acapulco, Hum b. ; Chili, 



Ravenel ; St. Elena, under stones, 



Cum. 

 Galap., under stones, Cum. 

 St. Elena, u. s., Cum. ; Mexico, Sow. 

 Mazatlan, Jewett ; Acapulco, Sloat ; St. 



Elena, Cum. 



Is. Plata, in coral sand, 14 fm., Cum, 



Red Sea, Kien. ; La Paz, Rich. 



Java, Kien. 



Panama, Bridges. 



St. Elena and Gal., Cum. 



Montija, 15 fm. coarse sand, Hds. 



St. Elena & Mte. Xti, 6-15 fm. sandy 



mud, Hds. 

 8° 57'— 21° 32', Hds. 

 San Bias, Hds. 



* The following abbreviations are used: — l.w. low water; s. spring tides; n. neap tides; 

 h. high water ; %-t. half-tide ; -f- above ; — below ; u. s. under stones, &c. 



