WATSON : MARINE MOLLUSCA OF MADEIRA. 373 



localities this is true, but how absolutely essential it is for 

 judging of species obtained at Funchal may be gathered from 

 the fact that from my own dredgings out to a depth of 50 

 fathoms and therefore from most genuine sea bottom sand — I 

 picked the following, many of them in considerable numbers — 

 Assiminea grayana Leach, Bythinia tentaculata L., Lhnncea 

 peregra Miill., Neritina fluviatilis L., Pisidium sp. (not P. wat- 

 soni Paiva), Planorbis carinahcs Miill., PL sp., PL sp., Valvata 

 piscinalis Mull, estuarine and freshwater species, not one of which 

 is to be found in Madeira, but which had been brought in 

 ballast, probably from Lisbon or the Thames. If in such com- 

 pany z.Mytilus ediilis L., presents itself its claim to recognition 

 as a native is felt to need more support than a few separate 

 valves from the one locality offer. It is this fact which renders 

 it necessary to offer somewhat more criticism of Senhor Nobre's 

 list than would have been necessary had fuller details been 

 supplied. 



To save repetitions here I use ' L® ' for the Rev. R. Lowe 

 and ' W for myself. 



Spondylus gaederopus Linne. 'Funchal.' L^ and W. 

 Common. This name has suffered much in varied spelling. 

 It is a popular Greek name of the present day (Adanson, 

 Senegal, p. 203) given from the resemblance of the shell 

 to the hoof of an ass (Bonanni Mus. Kirch, p. 441, 

 Lamarck A. S. vert., ist ed., vi. (i) p. 188). The spelling 

 of the modern Greek for a donkey is yaiSapos, with a 

 diaeresis over the t so as carefully to exclude the diphthong, 

 thus the name of the mollusc should be S. gdidaropus. 

 Pecten varius Lin. 'Funchal.' A species which from its 

 distribution might very well occur at Madeira (Lowe got it 

 at Mogador ; his three specimens — dead single valves are 

 in my collection), but has not been. -found by..eitheCiMr. 

 Lowe or myself at Madeira. . ..irfsorfr) f>f;o't .fsn ! -toT) 

 Pecten lowenii Dunker. ' Dredged in Funchal Bay.' This 

 is a species I do not know. Neither the description nor 



