PLATE LXXXVIIL 



Da Costa observes, that all the shells he had seen of this species 

 were fished up at, or near, Weymouth ia Dorsetshire; and concludes, 

 that it is rare in our seas, having never heard of it on any other Bri- 

 tish coast. We believe with Da Costa, it is local ; though it pro- 

 bably inhabits other parts of our coasts. 



We have been lately favoured with several shells of the Bulla 

 genus from Portsmouth, w?iich some Concho! oglsts have thought a 

 new species, and named Citrina; they do not, certainly, differ spe- 

 cifically from the shell in Da Costa's collection, which he calls 

 Bulla Naviacula, (HyJatis of Linnaeus) as will appear evident from 

 the specimens figured in the annexed plate. 



Fig. 1. — Bulla Naviacula (Ili/datis Linn.) — — Fig. 2, a specimen 

 from Portsmouth of a paler colour than Da Costa's shell.- — — Fig. 3, 

 4. old shells found on tlie mud and clay of the shore. 



