TITLES. 11 



188. [Clark, W.] On the Terebrating Mollusca. (2) v, pp. 6-14 [1850, 

 Jan.]. 



189. . Observations on the Littorinidce. (2) v, pp. 352-364 [1850, 



May]. 



189a. . Observations on the Laciince. (2) vi, pp. 29-35 [1850, July]. 



190. . Observations on the Animals of the Bullidce. (2) vi, pp. 98- 



108 [1850, Aug.]. 



191. . On the Pholadidce. (2) vi, pp. 313-336 [1850, Nov.]. 



192. . On the Conovididce, Tornatellidce, and Pyramidellidoe. (2) vi, 



pp. 444-464 [1850, Dec.]. 



193. . On the Mivricidce. (2) vii, pp. 108-130 [1851, Feb.]. 



With postscript describing Chemnitzia barleei, n. sp. 



194. . On the Chemnitzia opalina and C. diapJuina. (2) vii, pp. 292- 



297 [1851, April]. 



195. . On the Ghemnitzice. (2) vii, pp. 380-394 [1851, May]. 



196. . On the Classification of the British Marine Testaceous Mol- 

 lusca. (2) vii, pp. 469-481 [1851, June]. 



197. . On the Skeneadce. (2) viii, pp. 44-49, fig. [1851, July]. 



198. . Further Observations on the Ghemnitzice. (2) viii, pp. 108- 



113 [1851, Aug.]. 



199. . On a new British species of Lepton [L. clarkice]. (2) ix, pp. 191 



& 192 [1852, March]. 



200. . Further Observations on Lepton clarkice. (2) ix, pp. 293 & 



294 [1852, April]. 



201. . On the Ve7ius undata of authors. (2) ix, pp. 400-402 [1852, 



May]. 



202. . On some of the rarer British Gasteropodous Mollusca. (2) x, 



pp. 22 & 23, 77 [1852, July]. 



203. . On the genus Lepton. (2) x, pp. 129-134 [1852, Aug.]. 



204. . On some of the Animals of the Ghemnitzice which have not 



been described. (2) x, pp. 195-210 [1852, Sept.]. 



205. . On some undescribed Animals of the British Rissoa;. (2) x, 



pp. 254-263 [1852, Oct.]. 



206. . On the lanthince, Scalarice, JVaticce, Lamellarice, and Velutince. 



(2) xi, pp. 44-58 [1853, Jan.]. 



207. . On the Ghitonidae. (2) xi, pp. 274-283 [1853, April]. 



208. . On the Genus Truncatella. (2) xii, pp. 4-8 [1853, July]. 



209. . On the Rissoa rubra. (2) xii, pp. 107-110 [1853, Aug.]. 



210. . On the Branchial Currents in the Bivalves. (2) xii, pp. 303- 



318 [1853, Nov.]. 



211. . On the Aclis unica, Auct. (2) xiv, pp. 122-124 [1854, Aug.]. 



212. . On A7icylus oblongus and A. Jluviatilis. (2) xv, pp. 278-285 



[1855, April]. 



213. . On the Assiminia grayana and Rissoa anatina. (2) xvi, 



pp. 114-120 [1855, Aug.]. 



