MARINE MOLLTJSCA OF MADEIRA. 299 



-p. 130, xxxvi. 21i ; Marrat, in Sowerbj's Thesaurus, ly. 

 sp. 213, pi. cccl. (bis) fig. 446. Neither of these authorities 

 gives any habitat for the species. Weinkauff, who identifies 

 it with 0. pidcJiella, Duclos (see his Monog.pl. v. f. 11, 12), 

 gives Senegal as its habitat. Not knowing it from Madeira, 

 I quote it here simply as given " from Funchal " in Senhor 

 Nobre's list, and with extreme hesitation. 

 Omalaxis, see Bifrontia. 



215. Ostrea cocMear, 1795, Poll, Test. Sic. ii. 179, xxviii. 28. 

 Hub. Prom Bay of Biscay to Mediterranean. (Jn., W.) 

 Punchal, &c. Common. 



216. Ostrea cristata, 1780, Born, Mus. C£es. p. 112, vii. 3 ; Poli, 

 Test. Sic. II. 177, xxviii. 25-27. Hah. Mediterranean. 

 (L., Jn., W.) Magdalena, Punchal, &c. Common. 



217. Ovtda carnea, 1789, J. L. M. Poiret (as Bulla), Voyage, ii. 

 p. 21 ; Bruguiere, Encycl. in. 685, sp. 5, pi. ecclxvii. 2 ; 

 Kiener, Icon. Coq. Viv. i. 10, vi. 2. Hal. Mediterranean. 

 ("W.) Magdalena. One specimen brought up from 100 

 fathoms in a jar accidentally entangled in a fisherman's 

 line. 



218. Oxygyrus Keraudrenii, 1817, Lesneur (as Atlanta), Jour, 

 de Phys. lxxxv. 391, ii. ; Woodward, Man. Moll. pi. xiv. 

 24, 25. Sah. Pelagic. (Jn., W.) Prom Eunehal to East 

 point, &c. 



Panopcsa, see Saxicava. 



Patella. — The confusion both in the classification and no- 

 menclature of this genus is very great. I touch on no 

 disputed points when I state that no one at work on the 

 shore of Madeira can doubt that there are four, and only 

 four, very distinct and verj easily differentiated species, 

 and under the law of priority their names fall to them 

 without difficulty. Alphabetically arranged they are : — 



219. Patella aspera, 1819, Lamarck, An. s. Yert. Yi. (1) 328 ; 

 2nd ed. by Deshayes, vii. 529 ; d'Orbigny, Moll. Canar. 

 p. 98, vii. 9, 10 (as P. Loioei). [Hanley, see Wood, Ind. 

 Test. p. 185, xxxvii. 19, says that this is Dillwyn's P. re- 

 panda of G-mel. Syst. Nat. ed. Linn. Syst. Nat. IS'' ; but 

 both the locality ^' freto Maqellanico,''' and the description 

 " testa tenui .... margine repando,'^ remove Grmelin's 

 species very far from that found in Madeira. Dillwyn, 

 indeed, ascribes Gmelin's P. repanda to " Island of Cerigo," 

 but gives no authority for this assertion of Pavanne.] 



22* 



