25G Itcv. II. Clark on Dejean's Genus Coelomera. 



2. Paludina affinis. 



P. testa conico-ovata, suboblate perforata, solidula, HneiS spiralibus 

 impressis, subtilissimis vel obsoletis, fusco-comea, fasciis rufo- 

 fuscis 3-6 picta ; spira convexo-conoidea ; anfr. 5, convexi, sutxira 

 mediocriter profunda divisi ; apertura paulum obliqua, subcircu- 

 laris, angulo supero rotundato ; peristoma subcontinuum, iterate 

 nigro limbatum. 



Alt. 27, diam. major 23, min. 18J-, apcrt. alt. 16j, latit. 13| mill. 



Operculum normale. 



Australia; collected at Fitzroy river and near Port Essington 

 by Capt. Wickham, R.N. ; other specimens by J. II. Elsey, Esq. 

 (B.M.) 



This species stands nearly in the same relation to the pre- 

 ceding as P.fasciata, Mull. (P. achatina, Drap., Lam.), to P.v'trl- 

 para, Mull., the chief difference being in the outlines of the 

 whorls; besides, the spiral sculpture is much less developed in 

 P. affinis. The bands are almost the same as in P. australis; 

 but there is a third, secondary band between the second and 

 third principal ones. 



This species varies somewhat in the elevation of the spire, 

 several smaller specimens found at the same localities having 

 it more produced, and therefore being of a more oblong form, 

 and having a relatively smaller aperture. The dimensions of 

 one of these are as follows: — altit. 19i, diam. maj. 15, min. 12, 

 apert. alt. 1H, lat. 9 mill. 



3. Paludina polita. 



P. testa globoso-conica, perforata, nitida, lineis spiralibus impressis 

 subtilissimis hand valde confertis sculpta, corneo-lutea vel pallide 

 caruea, fasciis nullis ; spira conoidea, subgradata ; anfractus 5, 

 inflati, valde convexi, sutura mediocri ; apertura paulum obliqua, 

 ovata, angulo supero modice acuto ; peristoma plerumque con- 

 tinuum, iterate fusco limbatum. 



Alt. 224, diam. maj. 19, min. 17, apert. alt. 13, lat. 11 mill. 



Operculum normale, rufum. 



South Australia, on the Balonne river, New South Wales ; 

 found by John Macgillivray. Other regularly decollated speci- 

 mens, of a brighter red colour, in Lake Alexandria, found by 

 Mr. Strange. (B.M.) 



XXX. — An Examination of the Dejeanian Genus Coelomera (Co- 

 leoptera Phytophaga) and its Affinities. By the Rev. Hamlet 

 Clakk, M.A., F.L.S. 



The genus Ccelomera of Dejean's Catalogue (3rd edition, 1837) 



