239 



ting ribs are separated by wide and nearl}' flat interspaces, which latter 

 arc occupied with as nmny as eight or nine j-adiating raised lines, and 

 this seems to be also the case with Meek's tigui-ed type of the same 

 species. 



In the writer's judgment, the present shell is more nearly allied to 

 the Avicula Cornueliana of d'Orbigny, from the French Neocomian,* 

 (which Stoliczka says is an Oxytomd) than it is to A.. Munsteri. 



AucELLA PiocHii. (Gabb.) 



Inoceramm PiocMi, Gabb. — 1864. Palaeontology of California, Vol. T, p. 1S7 



pi. 25, fig. 173, (excl. fig. 174.) 



Aucella Fiochii, Gsibh. —1869. Idem, Vol. II, pp. 194 and 247, pi. 31, 



figs. 92 a-c. 



Since the first part of the present volume was published a very charac- 

 teristic valve of this shell was discovered in Mr. Eichardson's collection 

 of fossils from the " Lower Shales " of Skidegate Inlet west of AUiford 

 Bay. Although probably only a variety of the Aucella Mosquensis of Von 

 Buch, if indeed it is sufficiently different therefrom to rank even as a 

 variety, the occurrence of a specimen of the true A. Piochii at this 

 horizon is of considerable interest and worthy of being placed upon 

 record, as throwing some light on the stratigraphical position of the 

 deposit in which it was found.) 



Melina Skideqatensis. (N. Sp.) 

 Melina mytiloides ? Lamarck. This volume, pages 80-82, woodcuts, figs. 8 a, b. c, d. 



South side of Allifoi d Bay, in Skidegate Inlet : six large specimens. 



The shells described and figured in the first part of this volume, and 

 there regarded, though with much hesitation, as possibly varieties of 

 the Perna mytiloides of Lamarck, are now believed to be perfectly 

 distinct. 



They appear to belong to a previously undescribed species, for which 

 the name given above is suggested, and to be perhaps most nearly 

 allied to the Perna Fittoni of Pictet and Campiche,t from the Lower 

 Greensand of the Isle of Wight and the Gault of Switzerland. 



* Pal^ontologie Frangaise, Terrains Crltaces, Vol. 3, p. 471, Atlas, pi. 389, figs. 3 and 4. 

 t Pal^ontologie Suisse. Fossiles de Ste. Croix. Vol. 4, p. 95, pi. 157, fig. 2. 



April 8th, 1884. 4 



