MARINE MOLLUSCA OP MADEIEA. 275 



cccv. 3, copied from Lowe as Cassidula. Sab. Under stones 

 below high-water mark at the East end and along the whole 

 North coast of the island ; also at the Selvagens. Unknown 

 elsewhere. (L., Jn., W.) Very common. — Pfeiffer, Zool. 

 Blatter, xiii. (1866), gives this species on the authority of 

 de Paiva as from the South coast as well ; but de Paiva's 

 collectors are not to be trusted. 



29. Auricula gracilis, 1832-4, Lowe (as Melampus; 1854, Auri- 



cula), Zool. Jour. V. 288 ; Morelet (as A. vespertina). Hist. 

 Nat. Agores, p. 210, pi. v. 9. Sal. Under stones below 

 high-water mark on JSorth shore in fissures of the rocks; 

 also at the Selvagens. Always rare. Unknown elsewhere. 

 (L., W.) 



30. Auricula Paivana, 1866, Pfeiff'er (as Alexia), Mai. Blatt. 

 XIII. 146 ; Wollaston, Test. Atlantic, p. 295. Unfigured. 

 Sab. Under stones below high-water mark in the Selvagem 

 Grande, and there common : unknown elsewhere. (W.) I 

 follow Wollaston in giving this on Pfeiffer's authority as a 

 distinct species, though, as Wollaston mentions, Dr. Pischer 

 shared my opinion that it is a mere variety of A. bidentata, 

 Mont. 



31. Auricula PFatsoni, 1878, Wollaston, Test. Atlant. pp. 269, 



295. Unfigured. Sab. North coast, under high- water 

 mark. Selvagens : rare. Unknown elsewhere. (W.) 



32. Avicula hirundo, 1769, Linne (as Mytilus), Syst. Nat. p. 1159 : 



Gwyn Jefi"reys, Brit. Conch, ii. 95, ii. 3 ; & y. 178, xxv. 6. 

 Sab. Prom Channel Islands to Mediterranean and Canaries. 

 (M., L., Jn., W.) From Punchal along the coast east- 

 wards ; also Porto Santo. 10 to 50 f ms. 



33. Axinus croulinensis, 1847, Jeffreys, Ann. & Mag. xx. 19, 



ser.3, II. 122, V. 2 ; Brit. Conch, ii. 250; & y. 180, xxxiii. 2. 

 Sab. From the Lofotens to the Mediterranean. (W.) 

 Eather common. 



34. Bifrontia sanclea, 1844, Philippi, Enum. ii. 225, xxviii. 11 ; 



Sowerby, Manual, 4th ed. p. 84, xvi. 354-6; Woodward, 

 Manual, p. 135 ; Kobelt, Prodromus, p. 218 (as Omalaxis). 

 Sab. Mediterranean : in a few localities. Everywhere ; 

 very common. (M., N., Jn., W.) — Of course every one 

 knows that a good deal may be said against the generic name 

 here adopted, but even more perhaps can be urged in its 

 favour, and especially while so little is known of the animal 



