ON MOLLUSCA OP THE WEST COAST OF NORTH AMERICA. 239 



123. Crepidula striolata,Mke.= C. nivea, 



vai*. 



124. Goreensis,T)esh.'?z= C.nivea,va.r. 



125. Calyptresa (Trochatella) Lamarckii, 



[Mke. q.] Desh. 

 126. conica, Brod. 



127. (DyspotcBa) spinosa, Sow. 



128. cepacea, Brod. 



129. HipponyxfoUaceus, [Mke. q.] Quoy 



& Gaim. '?=H. serratus, 



130. Fissurella virescens, Sow. 



131. viminea, [Mke. q.] Rve. ?=F. 



ruffosa, var. 



132. Patella Mewicana, Brod. & Sow. 



133. Acmaa mutabilis, Mke. ? =fascicti- 

 laris -\-mesoleuca, pars. 



fascicularis, Mke. 



mesoleuca, Mke.=:^Patella dia- 



phana, Rve. not Nutt. 

 Sij)honaria dentieulata, [Mke. q.] 



Quoy & Gaim. Probably S. le- 



canium, var. 



134. 

 135. 



136. 



105. Olwa undatella. Lam. 



106. anazore, Duel. 



107. tergina, Duel. 



108. testacea, Lam. 



1851, pp. 33-38. 



109. Ovula emarginata. Sow. 



110. deflexa, Sow. 



111. Cypraa Arabica, Linn. 



112. ■ arabicula, Lam. 



113. (Trivia) pustulata, Lam. 



114. sanguinea. Gray. 



115. fusca, Gray. 



116. subrostrata. Gray. 



117. Terebra variegata. Gray. 



118. armillata, [Mke. q.] Hinds. 



119. luctuosa. Hinds. 



120. Mitra lens, Wood, = M, Dupontii, 



Kien. 



121. Crepidula contorta, [Mke. q.] Quoy 



& Gaim. 



122. costata, [Mke. q.] Sow. 



50. Among the many wasted opportunities of obtaining very valuable 

 information on geographical distribution, must unfortunately be recorded the 

 Surveying Voyages of the ' Herald ' and ' Pandora,' by Capt. Kellett, R.N,, 

 C.B., and Lieut. Wood, R.N. The former of these gentlemen commanded 

 the ' Starling' during the Sulphur Expedition. Their zeal for science is 

 shown not only by the large number of fine and valuable shells which they 

 brought back, but especially by the extreme liberality with whicii they have 

 presented them to public museums wherever they thought that they could 

 be made useful. "The shells were deposited in the Museum of Practical 

 Geology in Jermyn Street, London, then presided over by Prof, E, Forbes. 

 He writes that " they were chiefly collected on the coast of Southern Cali- 

 fornia, from San Diego to Magdalena, and the shores of Mazatlan." This is 

 precisely the very district of all others on which we are in want of accurate 

 information. San Diego belongs mainly to the Californian Province, Ma- 

 zatlan to that of Panama ; the question yet to be settled is, ? where and how 

 do they separate. Here was an exploration in competent hands on the very 

 terra incognita itself; and yet, alas! Prof. E. Forbes further states that 

 " unfortunately the precise locality of many of the individual specimens had 

 not been noted at the time ; and a quantity of Polynesian shells mingled 

 with them, have tended to render the value of the collection, as illustrative 

 of distribution, less exact than it might have been." Such information as 

 was accessible at the time was embodied by Prof, E. Forbes in two com- 

 munications to the Zoological Society, 1850; the first on the Land Shells, 

 collected during the Expedition, Proc. pp. 53-56 ; the second on the Marine 

 MoUusca, pp. 270-274-, The following abstract includes what may be sup- 

 posed to relate to our present subject of inquiry. 



From Oregon, Helix Townsendiana, H. Nuttalliana, and H. Columbiana. 



Helix Pandora, Forbes, p. 55. pi. 9. f. 3 a, b. Sta. Barbara, as per box label : San 



Juan del Fuaco, teste Forbes. 

 Kellettii, Fbs. p. 55. pi. 9. f. 2 a, h. Allied to H. Californiensis, Lea. Same 



locality. 



labyrinthus, var. sipuncnlata, p. 53. pi. 9. f. 4 a, b. Panama. 



— — vellicata, Forbes, p. 65. pi. 9. f. 1 a, b, c. " ? Panama." 

 ■ - aspersa, marked Sta. Barbara ; probably imported, p. 63. 



