CALYPTRiEA. 465 



eye on a bulging near the outer base. There is a slightly 

 developed semicircular, plain-edged, fleshy lobe on each 

 side of the neck. The mantle is single-edged, without 

 any trace of a fringe, and broader at one side than at 

 the other. In the cavity behind the head is seen the 

 pectinated branchial plume, the divisions of which are 

 long, linear, and rounded at their ends. The foot is 

 circular, with slightly produced angles on each side in 

 front. The tongue is rather broad and colourless. 



This Mollusk lays its spawn on stones and old shells. 

 The spawn is enveloped in bundles of fimbriated colourless 

 membrane, the edges of which appear white or yellow 

 owing to the included genus. The fry have a helicoid 

 shell, rather large eyes on the bases of short triangular 

 tentacles, and large ciliated neck lobes. Mr. Alder has 

 observed the Calyptraa to carry and hatch its spawn 

 under the neck in front of the foot, and a similar habit 

 has been noticed by Mr. Clark in Pileopsis Hungaricus. 

 A Calypfrtza, which we kept in confinement, swallowed 

 a Goniodoris nodosa preserved in the same vessel. 



This is essentially a southern British shell. It is 

 abundant in Jersey (S. H.) and Guernsey (Barlee) ; we 

 have taken it in Dartmouth reach in seven fathom water 

 (M'Andrew, and E. F.) ; Plymouth (Jeffreys) ; Salcombe 

 (Alder, Barlee); Falmouth (Cocks); Fowey (Peach, 

 Alder) ; Milford Haven in ten fathoms, apparently its 

 northernmost limit on the English coast (M'Andrew) ; 

 "on the east coast of Ireland 11 (Thompson). 



It does not range north of Britain, but southwards 

 extends to the Mediterranean. As a fossil it dates back 

 to the coralline crag. 



3 o 



