CYNTHIA MORUS. 87 



band of rose-colour or crimson around each aperture. 

 Tentacular Jila iii e at* pinnate. Branchial sac with seven 

 folds on each side, six of which are large and deep, that 

 near the dorsal line small. Ovaries forming botryoidal 

 masses on each side, with a fimbriated orange mass of 

 sperm-cells between. 



Length three quarters of an inch ; height about one- 

 third less. 



Hal. On shells and stones (in 25 fathoms water in 

 Mount's Bay). 



ENGLAND. Lulworth Cove, Dorset (Jeffreys). [Devon 

 (Forbes). ^\ Polperro (Louglvriri) ; Fowey Harbour 

 (Peacli^) ; [Bar Point and Helford Eiver, Falmouth 

 (Coclfs, 1849) ;] and Mount's Bay (Forbes fy McAndrew) ; 

 Cornwall. [Scilly Isles (Cams, 1850).] 



Ii; ELAND. [Strangford Lough (Dickie, 1857).] 



CHANNEL ISLANDS. Guernsey (Alder). 



First record. Forbes, 1848. 



The test of this pretty species (PI. XXX, fig. 6) is 

 hard and tough ; when contracted in spirit it has a 

 strongly-wrinkled, tubercular, and scaly aspect, and 

 on careful examination each tubercle is found to be 

 covered with a largish scale, thus showing that C. mortis 

 belongs to the tessellated group, with which it agrees 

 in all other respects. 



The mantle (PL XXX, fig. 7) is thick and fleshy 

 with the muscular fibres more closely arranged than 

 is usual in the members of this section, and there is a 

 strong muscular fold at the base of each tube ; the 

 tubes are cylindrical. 



The branchial sac (PI. XXXIII, fig. 2) has seven 

 moderately- wide folds on each side; that next the 

 endostyle is narrowest. The primary vessels are 

 pretty-regularly alternately large and small ; they are 

 placed rather close together, and on the folds there 

 are usually intermediate minute ones ; the secondary 

 vessels are short, and the stomata are elliptical. The 

 longitudinal rods are rather wide ; there are eight or 



