OCR Text |
Show 946 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE |JNoV. 29, Synonyms numerous. The shell referred to by Gmelin for his Mya membranacea from the figure in Olafsenand Povelsen's 'Voyage to Iceland' (t. xi. f. 10) is apparently the young of Mya truncata. That which Muller described and Gmelin named also Mya membranacea was probably Lyonsia norvegica. 2. MYA BINGHAMI, Turton. Sphenia binghami, Turt. Dith. p. 36, t. 3. f. 4, 5, and t. 19. f. 3. M. Binghami, B. C. iii. p. 70 ; v. p. 192, pi. 1. f. 3. ' Porcupine' Exp. 1870 : Atl. St. Tangier B. Distribution. Loffoden Is. to Bay of Naples and Tunis ; 4|-40 fms. Fossil. Miocene: Lapugy in Transylvania. Pliocene: Coralline and Red Crag. Post-tertiary: Larne, co. Antrim. The genus Sphenia of Turton is a mere synonym of Mya. All the characters given by him to distinguish it from Mya are the same in both. His S. swainsoni is the young of if. truncata. Family XXII. SAXICAVID^S. PANOPEA PLICATA, Montagu. Mytilus plicatus, Mont. Test. Brit. Suppl. p. 70. P. plicata, B. C. iii. p. 75, pi. iii. f. 2 ; v. p. 192, pi. Ii. f. 1. ' Porcupine ' Exp. 1869 : St. 9, 18, Donegal B. 1870: Atl. Vigo B., 24 ; Med. Adventure Bank. Distribution. Loffoden Is. to Algiers and Sicily, Canaries, Korea; 5-628 fms. Fossil. Miocene: Cassel. Pliocene: Coralline and Red Crag, Belgium, Italy. Post-tertiary : Belfast. There are several generic and specific synonyms. SAXICAVA RUGOSA, Linne. Mytilus rugosus, L. S. N . p. 1156. S. rugosa, B. C. iii. p. 81, pi. iii. f. 3; v. p. 192, pi. Ii. f. 3, 4. 'Lightning' Exp. : St. 1, 2, 4, 5. 'Porcupine' Exp. 1869 : St. 1, 2, 6, 9, 10, 14, 17, 23a, 35, 62, 65 (and semifossil valve of arctic or glacial type). 1870 : Atl. 3, 3a, 9, 10, 12, Vigo B., 13, Setubal B., 26-28, 36; Med. G. Bona, Rasel Amoush, G. Tunis, Adventure Bank. Distribution. Type and variety arctica, apparently everywhere in every sea throughout the world, at every depth from low water to 1622 fms. Fossil. Miocene, Pliocene, and Post-tertiary : nearly every part of Europe, northern Asia, and North America ; 0-1360 ft. This ubiquitous and variable shell has received more than twenty names in respect of its genus and species. Linne placed the type and some of the varieties in Mytilus, Solen, and Mya. The date of publication is the same for Mytilus rugosus and Mya arctica; but the former specific name is more generally used. I have therefore treated the latter name as varietal. |