26 CATALOGUE OF THE MOLLUSCA 



As this species has had the misfortune to be much misunder- 

 stood, we have thought it desirable to give the synonyms of dif- 

 ferent authors. Philippi published it in the first volume of his 

 "EnumeratioMolluscorum Siciliae," under the name of ^. angustata, 

 but changed it in the second volume to B. inmctata, Adams, and 

 quotes B. catena, Mont., as a synonym. 



4. B. QUADRATA, 8. Wood. 



Bulla quadrata, Wood in Charlsw. Mag. Nat. Hist. iii. 460, 



t. 7, f. 1. 

 Philine scutuluvi, Loven Index Moll. Scand. 9. 



Shell white, sub-diaphanous, globoso-quadrangular, rounded on 

 the back and a little constricted above ; covered with catenated 

 spiral strife, and having, in fresh specimens, one or two faint opake 

 bands. Apex subtruncated, sunk in the centre, but not umbili- 

 cated, exposing scarcely one volution. Aperture large and wide, 

 occupying nearly the whole of the shell : outer lip expanded 

 above, and nearly straight at the side, the edge thin and slightly 

 crenulated by the striae ; a little angulated below; base wide and 

 nearly straight ; inner lip thin, bent a little above from the 

 bulging of the body whorl into the aperture, not reflected but 

 having a pretty strong margin of enamel laid over the whorl. 

 Length ^ in., breadth 2-tenths. 



Of this interesting species a few fine specimens have been 

 obtained at Whitburn, by the Rev. G. C. Abbes and Mr. R. 

 Howse. It adds another to the species found fossil in the Crag, 

 which have lately been ascertained to be still living in our seas. 



Bulla quadrata diiFers from B. catena in the more globose and 

 subquadrate form ; also in having the apex broader and more 

 depressed. In outline it more nearly resembles B. aperta. We 

 have inserted a description of the recent shell, as its characters 

 have not been all distinctly made out from the fossil. 

 5. B. PRUINOSA, Clark. 



Bulla pruinosa, Clark in Zool. Journ, iii. 339. 



A specimen of this rare species was dredged by Mr. R. Howse, 

 oiF Whitburn, and another has also occurred to him in the sto- 

 mach of a fish. 



Bullcea aperta is included in Sir C. Sharp's list of Hartlepool 



