CARDIUM. 101 



C. FASCIATUM, Montagu. 



C.fasciatum, Brit. Moll. ii. p. 25, pi. 32. f. 5 ; (animal) pi. N. f. 3. 

 C. elongatum, Auctorum. 



Animal suborbicular, body flake- white ; mantle plain. Si- 

 phoiial tubes not exserted usually above Jth of an inch; of 

 the same length, united, each with ten simple white cirrhi, 

 and on them are the invariable filamentous appendages. The 

 foot is long, naiTOw and subcylindrical, or finger-shaped, and, 

 contrary to the Car diet in general, hyaline. The branchise 

 are subsemicircular, pale brown, the upper one not half the 

 size of the lower, strongly striated on the outside and smoother 

 within; the palpi are very short, triangidar but pointed, 

 striated on the outer, and much less on the inner surface. 

 The liver is green and very anterior ; the ovarium white, and 

 full of ova on 4th of August. 



It inhabits the coralline zone, and is rare at Exmouth. 



C. NODOSUM, Turton. 



C. nodosum, Brit. Moll. ii. p. 22, pi. 32. f. 7- 

 C. muricatulum, juv., Auctorum. 



Animal subglobose ; mantle open, edged with white pointed 

 filaments issuing from the points of the mantle corresponding 

 to the ribs. The siphons are pale yellow and very short, each 

 with ten or twelve flake-white cirrlii at the orifices and red 

 points at the bases, with the addition of the curved white 

 filaments above, below, and on the tubes; the anal one pro- 

 trudes the usual retractile valve. The foot is white, mode- 

 rately long, subcylindrical, and slightly geniculated. There 

 are a pair of semi- oval branchiae on each side, the upper is 

 not half the length and breadth of the under one ; they are 

 strongly pectinated on the upper, and less on the lower 

 surface; there are two very small triangular palpi on each 

 side, pectinated in a similar manner with the branchiae. 



This species, at Exmouth, is only met with in the coralline 

 zone, but it is not uncommon. 



We have ascertained by a comparison of the C. muricatulum 

 of authors, of sizes of less than y^th-y^ths of an inch dia- 



