294 cardiid^:. 



It is the C. Suediense of Reeve, C. Loveni of Thomp- 

 son, and C. Suecicam of Loven. 



B. Shell longitudinally oblong ; ribs slight and smooth, absent 



at the sides. 



10. C. Norve'gicum *, Spengler. 



C. Norvcgicum, Spengl. Skrivt. Naturh. Selsk. v. pt. 1. p. 42; R & H. ii. 

 p. 35, pi. xxxi. f. 1,2, and (animal) pi. N. f. 1. 



Body nearly oval, thick, yellowish-white : mantle flesh- 

 colour or reddish-white ; edges plain and white : tubes short, 

 united at their base and divergent at the point of separation, 

 pale yellow, marked with flake-white spots and lines ; the in- 

 current tube is rather the shorter of the two, but wider, and it 

 lias its orifice encircled by about 20 yellowish-white cirri of 

 different lengths, each having a dull red-brown line round its 

 base ; the excurrent tube has a plain orifice, with the usual 

 retractile valve, which is marked on the upper and lower 

 surface with a faint red -brown line, a few spots of the same 

 colour surrounding the orifice of this tube ; the sides of both 

 tubes and the posterior side of the animal are clothed with 

 thick-set pale reddish-brown and light-yellow curled fila- 

 ments : gills suboval, pale brown, with the edges of a deeper 

 hue, unequal-sized (as in the other species) but hanging more 

 vertically : palps very long, triangular, more deeply striated 

 on the outside than within : foot long and powerful, cylindri- 

 cal, geniculate, pointed at the extremity, covered (except at 

 the point) with a thin fleshcolour film, resembling shagreen 

 in appearance, under which it is pure white. The colour of 

 the different parts of the body varies in intensity and its rela- 

 tive hues, according to the age of the individual and the 

 nature of the sea-bottom. 



Shell longitudinally oval, with a triangular outline, mode- 

 rately convex, sloping gradually towards the front and sides in 

 a wedge-like form, slightly gaping at the posterior side, solid 

 and opaque, silky but not shining : sculpture, 40-42 extremely 

 faint ribs, which are quite flat and about as broad as the 

 intermediate spaces ; there are no ribs on the sides ; the whole 

 surface is crossed by remarkably crowded wavy striae, not per- 



* Norwegian. 



