MODIOLA. 61 
which it establishes a connection with the Anomiade, and 
perhaps in part with the Terebratulide. Iam not sure that 
any other except Anomia is in the same category, and in that 
genus the ovary is only glued to the area of the mantle, which 
rests on the lower valve. 
MODIOLA, Lamarck. 
M. parpata, Linneus et Auct. 
M. barbata, Brit. Moll. ii. p. 190, pl. 44. f. 4. 
M. Gibbsii, Auct. 
Animal elongated, thick; mantle open, double-edged, with 
red-brown: simple margins. The body is large, subrotund, 
brown; from it springs a byssal foot, having a large fissure at 
its hinder part, from whence a fine bushy dark byssus issues ; 
the anterior part is finger-shaped, white, not long or pointed, 
with a longitudinal central depression. On each side the body 
are a pair of narrow branchial lamine, the upper not half the 
depth of the lower; they are coarsely pectinated, and entirely 
coast the body, being brought close to the posterior extremity 
to receive the water. This structure of the branchiz is the 
substitute for the absence of tubes or any sort of siphonal fold 
of the mantle. The palpi are red-brown, long, flat, strongly 
striated transversely within, smooth on the outer surface. 
The shell of the present animal was 24 inches transverse 
measure ; it was taken in the dredge in 15 fathoms water in a 
six-mile offing at Exmouth; they are rare in that locality. 
M. tuipa, Lamarck. 
M. tulipa, Brit. Moll. ii. p. 187, pl. 45. f. 7, and pl. 48. f.6; and (ani- 
mal) pl. Q. f. 6. 
Animal elongated, body thick, pale red; mantle open, 
margin simple, plain, forming two very short, of the same 
length, scarcely separated pale yellow siphons, each fringed 
with about 20 close-set short cirrhi. Foot long, flattish, 
slender, with an intensely flake-white longitudinal line in the 
centre, having a byssal groove, creasing in depth from point 
to heel, from which, on its posterior side, a fasciculus of strong 
