TELLINA. 127 



the stomach and intestine, exhibited no peculiarity. The 

 large posterior dorsal mucous gland was well developed, the 

 colour being a moderately dark brown : this gland crosses the 

 dorsal line near the posterior adductor, and perhaps is a 

 receptacle for the pigments of the mantle. 



This species inhabits the coralline zone at Exmouth, but is 

 rarely taken alive of good size. 



T. FERROENSIS, Chemnitz et nobis. 

 Psa mmobia farroensis, Brit. Moll. i. p. 274, pi. 19. f. 3. 



Animal elongated, compressed, white or of the palest brown ; 

 mantle open, with the margin clothed with a short white 

 fringe, or rather fine dentations. The siphonal apparatus con- 

 sists of the usual slender separated tubes, the branchial being 

 rather the longest and largest, having six plain cirrhi at the 

 orifice ; when not fully extended it appears finely corrugated, 

 and has two longitudinal bars on the surface ; the anal siphon 

 curves upwards, the orifice being destitute of cirrhi. The foot 

 is very large, flat, long, bevelled to a sharp edge, and lanceo- 

 late. There are a pair of branchiae and a pair of palpi on 

 each side ; the under laminse are by far the largest, long, 

 deep, and subquadrangular ; the upper ones are not above 

 half the size, of suboval shape, and have a lanceolate ter- 

 mination, hanging on the posterior portion of the large ones ; 

 they are all visibly striated on both surfaces; the palpi are 

 long, subtriangular, and very well pectinated. The liver is 

 pale green, conjoined with the pale yellow ovarium, which in 

 July is full of ova in all states of development. 



This elegant and variously coloured species as to the shell, 

 is frequently taken in the dredge in the coral zone in a living 

 state. 



T. TELLINELLA, 



Psammobia tellinella, Brit. Moll. i. p. 277? pi- 19- f- 4; and (animal) 



pi. K. f. 1. 

 P. florida, Turton. 



Animal elongated, compressed, pure white; mantle open, 

 dentated ventrally, and fringed posteriorly from the beaks to 



