51 



Cxtirdncr, sa^'s of^. Clementina Mich., " I have had an opportunity of ex- 

 amining the original ofD'Orbigny's tigui-e in the 'Paleontohjgie Fran§aisc ' 

 at the Ecole des Mines, and find that the di'awing represents the whorls 

 more convex and inflated tlian they really are, and the aperture is a rest- 

 oration. Again, spcak'ing of aS'. Dujnniana D'Orbigny, the same writer 

 says : — " The mouth is very imperfect, and has evidently been restored in 

 the drawing." So rare is it to find (he apcrtui'c perfect in shells of this 

 group, that out of twenty Bi'itish species supposed to belong to the Scalid(P, 

 Mr. Gardner has only seen one with the outer li]> perfect. 



The distant rib-like folds which become obsolete above and below in Mr. 

 Iiichardson's specimen, are verj' unlike the varices of Scalaria or OpaWt, 

 which are not onl}' continuous from suture to sntui'e, but which also fi-e- 

 quently traverse nearlj- the entire length of the shell. The relations of 

 the present species are probabl}' nearer to .-f^vo/v/m/'-s, or even to Potamides 

 or Cei'ithidea in the family Cerithiadai', than to the Scalidti}. 



Mr. Gardner justly remarks ("Geological Magazine,"' February, 187(3, 

 page 76), " There is some analogy between fragments of Scalaria and 

 Aporrhais when the last whorl is not present." It is difficult to detect 

 much difference between the present fragment and the shell figured by 

 Sowerby^ as Rostellaria elongata, except that the whorls of the former are 

 very much flatter and less conical than is the case with the much better 

 specimens of the same shell recently figured by Mr. Gardner as Aporrhais 

 elongata. 



Possibly the affinities of the Queen Charlotte Island shell may have 

 been with some of the European Wealden or Purbeck fossils (such as 

 Potamides attenuata, tricarinata and harpa; for mis') formerly' referred to 

 Melanopsis but now included in Brongniart's genus Potamides. 



Pleurotomaria Skidegatensis. (N. Sp.) 



Plate IX, tigiires 6, Ga. 



Shell tiu-binate-conical, wider than high ; spire shorter than the body 

 whorl ; umbilicus deep but narroAV, less than oue-thii'd the diameter of 

 the base. Whorls five, those of the spire bluntly and obscurely angulated 

 about the middle. The angulation is scarcely perceptible in the first 

 two volutions, but the two specimens yet obtained are much Avorn ; 

 the apex appears to have been obtuse. Below the central angle the 



* " Tiansacliyiis of the Gcologica.1 Sotioty of London." Second Seiius, Vol. IV., page 3o(i, Plate XJ, lig. (J. 



