44 THE CRAG POLYZOA. 



Habitat —C Crag, on various shells, S. Wood. {Recent) Britain (south and east 

 coast), Orkney (?) ; Gibraltar Bay. 



This fossil differs from the usual form of the recent L. violacea in the more decided 

 marginal puncturation. Generally, in L. violacea, obscure traces of such punctures are 

 seen only in the very young cells at the margin of the crust ; the older cells, which have 

 acquired the peculiar blackish-blue tint, so characteristic of the living species, exhibiting 

 no signs of punctures either on the surface or at the margin. The cells occasionally become 

 much thickened and bossy. That punctures may exist, however, in this species, is evidenced 

 not only in the fact that in the young cells distinct punctures may be perceived around 

 the border in almost every specimen where such cells exist, but also that specimens some- 

 times occur in which the whole surface is freely punctured. An instance of this kind, 

 from Hastings, is in my possession. 



8. L. PLAGIOPORA («. sp.) PI. IV, fig. 5. 



CelluUs pyriformibus, marginem circa puncturatis, punctis canaliculatis ; aviculario 

 magno mandihulo sursum oblique spectante, armatis ; atque foramen depressum infra 

 avicularium ostendentibus. Orificio semicirculari, labio inferiori recto. 



Cells pyriform punctate round the border, puncta channelled ; a large avicularium on 

 the front of the cell, whose mandible is pointed obliquely upwards ; a central perforation 

 below the avicularium ; orifice semicircular, with a straight border below. 



Cellepora Heckelii (?), Reuss (1. c), p. 8o, pi. x, fig. 10. 



Habitat. — C. Crag on shell ; S. Wood. 



This might be taken as a variety of L. violacea, but the very different size and 

 position of the avicularium (much better marked in some specimens than it is in the one 

 figured) which appears to be a very constant character, show their specific distinction. 



9. L. EDWARUSIANA {n. Sp.) PI. V, fig. 2. 



Celluhs alte immersis, superficie puncturata, inequali ; orificio suborbiculari, infra 

 uno latere late sinuato ; sinu canaliculate ad avicularium magnum laterale tendente ; 

 peristomate valde incrassato, elevato. Ovicellula parva, subpyramidali. 



Cells deeply immersed, surface punctured, uneven ; orifice suborbicular, below with 

 a wide sinus on one side, leading towards a large avicularium placed on the same side of 

 the cell immediately below the orifice ; peristome much thickened and elevated ; ovicell 

 small, subpyramidal. 



Habitat. — C. Crag, on shell ; S. Wood. 



