REV. B. T. Lowe's list of mo&adouian shells. 1G9 



A List of tlie Shells observed or collected at Mogador and in its 

 immediate environs during a few days' visit to the place in April 

 1859 ; with notes and observations. By the Eev. E. T. Lowe, 

 M.A. Communicated by the Seceetart. 



[Eead Februaiy 16, I860.] 



[For introductoiy observations, see the Botanical section of the Society's 

 Joiimal for the present year (p. 26).] 



The shells of Mogador will be more conveniently considered in 

 their two natural divisions of sea- and land-shells, separately. 



More than one-half, i. e. 53 in 90, or very nearly tln-ee-fifths of the 

 whole number of marine Mollusks contained in the following list, 

 are found for the most part commonly in Britain ; and in fact nearly 

 all the more common sea-shells, thrown up most abundantly on 

 the extensive sandy beach of Mogador, are those of our own 

 British shores. Such are peculiarly, for example, PJiolas Bactylus, 

 L., P. Candida, L., Saxicava rugosa, Lam., 8olen SHiqua, L., 

 TelUna tenuis, Da Costa, T. Fabula, Gron., T. solidula, Pult., 

 Scrohicularia piperata, Grm., Donax anatinus, Lam., D. denticu- 

 latus, L., Liitraria oblonga, Chemn., Macfra stultorum (L.), 31. 

 suhtruncata, Da Costa, Tapes decussatus (L.), T. Fullastra (Mont.), 

 Venus siriatula, Don., Artemis lincta (Pult.), lAicinopsis undata 

 (Penn.), Cardium aculeatum, L., Lucina borealis (L.), Mytilus 

 edulis, L. var., Nucula Nucleus (L.) ?, Area harhata, L., Anomia 

 Ephippiwn, Jj., Patella atliletica,^e2m, P. pellucida,Jj., Fissnrella 

 reticulata (Don.), Trochus zizypliinus, L., T. granulatiis, Born, 

 T. u)7ibilicatus, Mont., T. lineatus (Da Costa), Turritella com- 

 Qnunis, Eisso, Scalaria clatliratula (Mont.), Natica nitida (Don.), 

 Jilurex Urinaceus, L., Purpura LapiUus (L.), Nassa reticidata (L.), 

 Cyproea europcea, 'Mont., Tornatella faseiata, Jjam. Of these the 

 greater portion have not been observed at all, and the rest only 

 rarely or accidentally occur in either the Canaries or Madeira ; 

 but in both these groups of islands an entirely diiferent set of 

 common species takes their place, presenting more affinity with 

 those of the Mediterranean. 



This last fact is unfavourable to any hypothesis of a former con- 

 nexion of these islands with the neighbouring continent. Por it 

 cannot be explained by any supposed change or difference in the 

 structural nature of the coasts themselves, produced by, or subse- 

 quent to, their separation : the shores both of Porto Santo in the 

 Madeiran, and those of Grand Canary, Lanzarote, and Fuerte- 

 ventiu-a in the Canarian group, being at this moment precisely 



LINN. PEOC. ZOOLOGY. 12 



