MARINE MOLLUSCA OF MADEIRA. 293 



165. Melampus exiguus, 1832-4, Lowe, Zool. Journ. y. 291, xiii. 



6, 7; Pfeiffer, Monog. Auric. Viv. p. 56; id. ibid. Suppl. 

 p. 326 ; id. Auric. Mad., Malak. Blatter, 1866, p. 142 ; 

 Paiva, Mai. Mad. p. 150. Sab. Madeira. (L., W.) North 

 shore, Punta de Sao Lourenco ; Selvagens. Pare. 



166. Mesodesma cornea, 1791, Poli, Test. Sic. I. 73, & II. xix. 



8 to 11. Rab. Mediterranean. — I give this species on the 

 authority of Sen. Nobre, who got it in dredgings from 

 Canical. I have never met with it. 

 Mesalia, see Scalaria. 



167. Mitra cornicula, 1767, Linne (as Yolutci), Syst. Nat. p. 1191; 



Kiener (as M. lutescens, Lam.), Iconog. Coq. Viv. in. 31, xi. 

 32, xii. 36, &c. Rab. Portugal and Mediterranean to Moga- 

 dor. (M.,L.,N., Jn., "W".) Everywhere; excessively common. 



168. Mitra Zebrina, 1839, d'Orbigny, Moll. Canar. p. 86, vi. 



29-31 (not M. Zebra, Leach) ; Sowerby, Thes. iv. 23, 

 sp. 300, pi. xxii. 481. Sab. Canaries. (M., L., N., Jn., W.) 

 Everywhere. Alive on the shore-rocks, and there dark 

 green ; but in deep water dead and discoloured brown by 

 passage throxigh fish's stomach. Extremely variable, with 

 proclivities towards M. tricolor, Gd. 



169. Modiolaria discors, 1767, Linne (as Mytilus), Syst. Nat. 

 p. 1159 : G-wyn Jeffreys, B. C. it. 126 ; & v. 171, xxviii. 3. 

 Sab. Erom the U.S. coast to N. Greenland, Canada, Nor- 

 way, and Mediterranean. (Jn., ~W.) One young valve alone 

 in each collection. The range of the species alone justifies 

 its introduction into this list. 



170. Modiolaria stibclavata, 1859, Libassi, Atti Panorm. in. 13. 



fig. 7 ; Gwyn Jeffreys, Moll. Lightn. & Pore, P. Z. S. 1879, 

 p. 568. Sab. From Brittany to Canaries. (L., Jn., W.) 

 Erom Magdalena, Cabo Girao, Eunchal to East end of 

 Island. Very abundant. 

 Monodonta, see Trochus. 



171. Montacuta bidentata, 1803, Montagu (as Mya), Test. Brit, 

 p. 44, xxvi. 5 : Gwyn Jeffreys, B. C. n. 208; & v. 177, xxxi. 8. 

 Sab. Norway to Mediterranean. (Jn., W.) Eunchal. 15 

 to 20 valves. 



172. Montacuta ferruginosa (?), 1808, Montagu (as My a), Test. 



Brit. Suppl. I. pp. 22 & 166, xxvi. 2 : Gwyn Jeffreys, 

 B. C. ii. 210 ; & v. 178, xxxi. 9. Sab. Erom New England 

 to Greenland, North Norway, Mediterranean, Canaries, 

 and Mogador. 3 imp. to 733 fins. (L., W.) Coast from 



