125 GENERA AND SPECIES. 



Limopsis. (ARCADE.) Plate i. 



17. aurita, in. x^ in. ridges of shell beaded. 



18. borealis, J in. x^ in. ridges of shell not beaded. 



Littorina. (LITTORINIDJE.} Plate xxiii. 



387. obtusata, in. shell over inch long, spire depressed, 



colours various. 



388. neritoides, in. shell about Jinch long, spire pointed, colour 



brown. 



389. mdis, in. shell inch, spire pointed, suture distinct. 



390. littorea, i^ in. shell over f inch, spire pointed, suture in- 



distinct. 



391. astuarii, f in. shell under inch, spire slightly raised and 



compact, colour greenish brown. 



Lomanotus. (LOMANOTID&.) Plate xxxii. 



597. mannoratus, % in. body drab marbled with brown and white. 



flavidus, J in. body pale yellow above, white below. 



portlandicus, if in. body white, light brown on back, and bright 

 red in front. 



Loripes. (LUCINID^.) Plate vii. 



63. lacteus, % in. x 5 in. margin smooth and plain. 



64. divaricata, fin. x in. margin finely toothed. 



Lucina. (LUCINID&.) Plate vii. 



61. spinifer, I in. x ^ in. hinge line an obtuse angle, inside pearly. 



62. borealis, i in. x if in. hinge line curved, inside white. 



Lucinopsis. (VENERIDM.) Plate x. 



122. undata, i in. shell circular, white, yellowish at the beaks. 



A variety, cequalis, has a squarish shell, with more prominent beaks. 



Lutraria. (MYIDJE.) Plate xii. 



147. elliptica, 5^ in. x 3 in. shell elliptical. 



148. oblonga, 4 in. x 2 in. shell turned up at posterior end. 



Lyonaia. (LYONSIID&.) Plate xv. 



173. norvegica, i|in. x ^in. shell rhomboidal, cartilage golden yellow, 

 ossicle quadrangular. 



Mactra. (MACTRIDJS.) Plate ix. 



108. solida, if in. x if in. white, beaks projecting slightly. 



109. elliptica, ij in. x f in. shell elliptical and thin, beaks not projecting. 



