254 PATELLID^E. 



white lines, within which are the usual fleshy corneous plates 

 and spinous tongue; the tentacula are long, pointed, white, 

 setose, with large eyes on short offsets placed very laterally at 

 the exterior bases. The foot is pedicled, oval, pale yellow 

 above and below, having around it, near its junction with 

 the body, which at that part is flake- white, a cordon of about 

 twenty-four short, thick, white fillets. 



In this species, the two branchial leaves are fixed by small 

 united pedicles in a cavity at the back of the neck, with the 

 leafy portion falling on each side the fissure ; the stomach, 

 with the intestine, is enveloped by the liver, and the rectum, 

 after issuing from the black green mass, which is, at the upper 

 part of the animal, mixed up with the lighter-coloured ova- 

 riurn, is, as in the last species, embraced by the heart and two 

 auricles, and terminates at the fissure. The oesophagus is 

 short, and encircled by three or four yellow medullary gan- 

 glions, throwing off the usual nervous threads. We here 

 supply an omission in the last species, by stating that in it 

 nearly the same nervous arrangement is seen. 



The salivary glands are two fasciculi of filaments, greatly 

 resembling those of Dentalium tarentinum. We infer from this 

 circumstance that, like that animal, this also is a zoophagite, 

 and feeds on scabrous food that requires a copious saliva to 

 assist deglutition. 



All the animals of the Patelloid group are without opercula ; 

 it is said that the Pileopsis secretes from the foot a rudi- 

 mentary testaceous lamina, but, though we have observed 

 many of the P. hungarica, this peculiarity was not observed, 

 and we think, when that species is spoken of below, we may 

 explain what has given rise to this idea. 



The E. reticulata, and the variety, are taken in abundance 

 at certain epochs in the coralline zone at Exmouth. The 

 only other species is the 



E. CRASSA, J. Sowerbv. 



V 



E. crassa, Brit. Moll. ii. p. 481, pi. 63. f. 2; (animal) pi. C.C. f. 2. 



