SAXICAVA. 87 



Ociitis SAXICAVA, Fleurian de Bellevue. (1802.) 



Shell elongate, irregular, inequipartite, slightly gaping at each 

 end. Hinge generally toothless or with only a rudimentary tooth 

 in each valve ; beaks small ; ligament external, long, strong ; pallial 

 sinus narrow and deep. 



Saxicava rugosa. 



Shell multiform, generally oblong, rounded before and truncate behind, with a 

 prominent ridge from the beaks to the lower posterior angle ; surface rough. 



Mi/tiltis riigosiis, Penn. Br. Zool. iv. 110, pi. 63. fig. 72. — Montagu, Test. Brit. 42. pi. 1. 



fig. 1. — Doxov. Br. Shells, iv. 141, fig. 141 ; Linn. Trans, viii. 105; Dorset Catal. 



39, pi. 13, fig. 5. — TuRT. Conch. Diet. 113. — Dillw. Kcccnt Shells, i. 304.— 



Wood, Ind. Test. pi. 12, fig, 9. 

 Saxicacn rugosa, Lam. An. sans Xcrt. 2d cd. vi. 1.52; Spec, of Shells, Engl ed. 50. — 



TuRT. Dyth. Brit. 20, pi. 2, fig. 10. — Brown-, 111. Conch. Gr. Brit. 103, pi. 47, 



figs. 14, 16. — Crouch, Introd Conch, pi. 5, fig. 3. — Sowerby, Gen. (Saxicava) 



figs. 2, 3, 4. — Rbeve, Conch. Icon. i. pi. 50, figs. 2, 3, 4. — Woodward, Man. of 



Moll. 320, pi. 22, fig. 13. — Haxley, Recent Shells, Snppl. 50. — Forbes and Hanl. 



Hist. Brit. Moll. i. 146, pi. 6, figs. 7, 8, ph F, fig. 6 (animal). -Chenu, Man. de 



Conch, ii. 25, fig. 1 1 1. — Adams, Gen. 349, pi. 94, figs. \,\a,\b (animal). — Stimp- 



SON, Mar. Inv. Gr. Manan, 22 ; Shells of New England, 25. 

 Hiatella rugosa, Flem. Br. Anira. 461 ; Brit. Mar. Conch. 58. 

 Mutilus pholadis, Muller, Zool. Dan. pi. 87, figs. 1, 2, 3. 

 Saxicava pholadis. Lam. An. sans Vert. 2d ed. vi. 152. — Turt. Dvth. Brit. 21, pi. 2 



fig. 11. — Hanl. Recent Shells, 50. — Guerin, Mag. de Zool. 1841, pi. 40. 

 Saxicave rich'e, Chenu, Trait. Elcm. 58, figs. 197, 198. 

 Byssomya pholadis, Bowditcii, Bivalves, fig. 43. — De Blainv. Man. 572, pi. 80, figs. 



5, 5 a. 

 Mya hyssifera, 0. Fabr. Fauna Gnenl. 408. 

 Saxicava di^torta, Say, .Journ. Ac. Nat. Sc. ii. 318 (1822). — Gouud, Inv. Mass. 1st ed. 



62. — De Kay, Nat. Hist. New York, 227, pi. 33, figs. 309 o, 309 6. 



Animal with the mantle loljos united in front ; siphons large, 

 united nearly to their ends, which arc fringed, tlio anal opening 

 furnished with a transparent tubular valve ; ojjening for the foot 

 small ; foot fingcr-liko, wHth a byssal groove ; gills narrow, unequal, 

 prolonged into the siphon. 



Shell oblong-oval, coarse, wliitc, very irregular in sha])e ; iuequi- 

 valve, the right valve projecting over the left except at the shorter 

 end ; inequilateral, the anterior side rounded and generally of about 

 one half the length of the other side, but the l)eaks are sometimes 

 nearly terminal ; the posterior end is most frequently truncated, 

 but at other times rounded ; gaping ; beaks rather prominent, fi'om 



