SAXICAVA. 87 



Oeniis SAXICAVA, Fleurian de Bellevce. (1802.) 



Shell elongate, irrcg-ular, iiie(|uipartitc, slightly gaping at each 

 end. Hinge generally toothless or with only a rndinientary tooth 

 in each valve ; beaks small ; ligament external, long, strong ; j)allial 

 sinus narrow and deep. 



Saxicava rugosa. 



Slu'll inultifoi-m, p-onorally ol)loug, ri^tinded before and truncate beliind, with a 

 [ironiinent ridi^-e ii'oui the beaks to the lower posterior angle ; surl'aee rough. 



Mijtihis rugosK.^, Texn. Br. Zool. iv. 110, pi. 63 fig. 72. — Montagu, Test. Brit. 42. pi. 1. 



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



39, pi. 13, fig. .5. — TuKT. Conch. Diet. 113. — Dillw. rvccent Shells, i. 304.— 



Wood, Iml. Test. ]tl. 12, fig 0. 

 Saxicami riuioKu, Lam. An. sans Vert. 2(1 eil. vi. 152; Spec, of Shells, Engl ed. 50.— 



TuRT. Dyth. Brit. 20, pi. 2, fig. 10. — Brown, 111. Conch, (h: Brit. 103, pi. 47, 



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



figs. 2, 3, 4. — Reeve, Conch. Icon. i. pi. 50, figs. 2, 3, 4. — Woodward, iVIan. of 



Moll. 320, pi. 22, fig. 13.— IIani.ey, Recont Shells, Suppl. 50. -Forbes and Hanl. 



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



Conch, ii. 25, fig. 111. — Adams, Gen. 349, pi. 94, figs. I, la, lb (animal). — Stimp- 



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

 Hialella rmpsa, Flem. Br. Anim. 461 ; Brit. Mar. Concli. 58. 

 Mi/ti/us pholadis, Mullek, Zool. Dan. pi. 87, figs. 1, 2, 3. 

 Saxicat-a pholadis, Lam. An. sans Vert. 2d ed vi. 152. — Turt. Dyth. Brit. 21, pi. 2, 



fig. 11. — Hanl. Recent Shells, 50. — Guerin, Mag. de Zoul. 1841, ])1. 40. 

 Saxicave ridee, Chenu, Trait. Elem. 58, figs. 197, 198. 

 Bi/ssomya pholadis, Bovvditcii, Bivalves, fig. 43. — De Blainv. Man. 572, pi. 80, figs. 



5, 5 a. 

 Mya hyssifera, 0. Faur. Fauna Gntnl. -408. 

 Saxicava diMorta, Say, Joiirn. Ac. Nat. Sc. ii. 318 (1822). — Gould, Inv. Mass. 1st ed. 



62. -De Kay, Nat. Hist. New York, 227, pi. 33, rigs. 309 </, 309 6. 



Animal with the mantle lol)es united in IVoiit ; sij)hons large, 

 united nearly to their ends, which are fringed, the anal opening 

 furnished with a trans[)arent tu1)ular valve ; ojiening for the foot 

 small; foot finger-like, with a hyssal groove ; gills narrow, unequal, 

 prolonged into the siphon. 



Shell oblong-oval, coarse, white, very irregular in shajie ; inequi- 

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

 end ; inequilateral, the anterior side rounded and generally of al)Out 

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

 nearly terminal ; the ])osterior end is most frequently truncated, 

 but at other times rounded ; gaping ; beaks rather jn'ominent, from 



