STYELA POMAEIA. Ill 



Body ovate or subconical, rather irregular, rugose, 

 largely attached by the side or base. Apertures not far 

 apart, rather prominent. Test brownish or yellowish, 

 sub-opaque, strongly wrinkled longitudinally and less 

 prominently in a transverse direction so as to give it a 

 pustulose appearance ; the surface slightly roughened, 

 but not hispid. Mantle opaque, bright crimson above, 

 fading into orange or yellow beloAV. Tentacular fila- 

 ments slender. Branchial sac with four folds on each 

 side ; oral lamina smooth. Ovaries globose, red, 

 dispersed over the inside of the mantle in imperfect 

 longitudinal rows. 



Length from half to three quarters of an inch. 



Hab. In shallowish water. 



WALES.- -Teiiby, Pembroke (Alder). 

 IRELAND. Portmagee, Kerry (Allmari). 

 CHANNEL ISLANDS. Guernsey (Hodge Brady}. 

 Gouliot Caves, Sark (Norman}. 

 First record. Alder & Hancock. 



The test of this species (PI. XXXVII, fig. 5) is 

 hard, firm, and rather thick, with the inside silvery 

 white. 



The mantle (PI. XXXIX, fig. 4) is thick, tough, and 

 muscular, with the fibres inconspicuous on the surface; 

 but, when the reproductive organs are removed, strong 

 muscular fibres are seen to line the inside, arranged for 



7 G 



the most part diagonally from the ventral line down- 

 wards and backwards. The tentacular filaments are 

 numerous and vary in size ; they are delicate, not long, 

 and nearly linear. 



The folds of the branchial sac (PI. XLII, fig. 1) 

 are moderately developed ; the primary vessels are 

 numerous, not much apart, variable in size with usually 

 minute ones interspersed, crossing the stomata; the 

 secondary vessels are rather stout and short, and the 

 stomata are rounded at the ends. The oral lamina is 

 smooth, narrow, and widened a little below. The 

 branchial tubercle (PI. XL VIII, fig. 10) is peculiar; it 



