68 MARINE POLYZOA. 



mersed ; mouth rounded, immersed or level (never raised) ; a 

 minute avicularium with semicircular or rounded mandible on or 

 within the middle of the lower lip, which sometimes projects into 

 a rostrum. Ovicell small, deeply immersed, inconspicuous, not 

 punctated. 



Hab. Copeland Islands, Belfast Bay, deep water, on shell and 

 stone, W. Thompson. Belfast Bay, 20-25 fathoms, on shell, id. 



Forms an elegant close covering to stones and shells. The 

 species appears to have been hitherto undistinguished, having 

 apparently been confounded wtihL.immersa or trispinosa, Johnst., 

 L. variolosa, &c., but it is clearly distinct and readily charac- 

 terized by the mouth, which is never raised, and usually, in the 

 older portions of the patch, deeply immersed ; its form is wide 

 above and contracted below, but without the sinus of L. reticu- 

 lata and trispinosa ; nor is it furnished with any spines ; and the 

 central avicularium on the lower lip is within, or at all events 

 immediately on, or forming part of the margin of the mouth, and 

 not a little below it as in L. reticulata, in which species, moreover 

 the mandible is acute. From L. auriculata also it differs in the 

 absence of oral spines. 



8. LEPRAHA VERRUCOSA. Pl.LXXXVII.figs.3,4. Pl.XCIV. 



fig. 6. 



Cells immersed at the base, ventricose, front rising into a strong 

 pyramidal rostrum or umbo, from which ridges radiate towards 

 the sides and bottom ; surface usually verrucose ; mouth orbi- 

 cular, upper margin deeply immersed, sometimes rising on each 

 side into a blunt tooth-like process, and sinuous in front, some- 

 times quite plain ; an avicularium with semicircular mandibles 

 on the upper side of the rostrum or umbo. Ovicells ? 



? Cellepora verrucosa, Esper, Cellep. t. 2, figs. 1, 2; not Disco- 

 pora verrucosa, Lamk. Hist. ii. 164, ed. 2. ii. 248. 



? Lepralia Johnstoni, Bean, MSS. 



Lepralia verrucosa, W. Thompson, Ann. Nat. Hist. xiii. 441 ; 

 Johnst. Hist. Brit. Zooph. ed. 2. p. 316. t. 56. fig. 3. 



Lepralia reticulata, Couch, Corn. Faun. iii. 117. pi. 22. fig. 9. 



Discopora verrucosa, Gray, List Brit. Had. p. 126. 



Hab. Scarborough, Bean. Scotland (Ayrshire?), Dr. Lands- 

 borough. 



The avicularium on the upper side of the projecting rostrum 

 or umbo is to a great degree concealed by that process in front, 

 but will be observed if the specimen be turned in such a direction 

 that a view of the upper side of the projection is obtained. 



