448 J. F. Whiteaves—Age of Mesozoic Rocks, ete. 
Moreover this series was directly compared with authentic 
specimens of B. densus from Dakota, received from Mr. Meek, 
and it was found necessary to mark all the fossils from the 
two localities as it would otherwise have been impossible to 
separate them. 
2. Lyosoma Powelli White. The fact that the writer gave a 
different generic and specific name to Vanikoro pulchella is a 
sufficient indication that the analogy between it and ZL. Powelli 
was supposed to be more remote than that which is supposed to 
obtain in any of the other instances cited. ‘ 
3. Pleuromya subcompressa Meek. The type of this species 
was figured by Meek in 1873, and since then Dr. White has 
illustrated three well marked varieties of it. Specimens which 
agree perfectly with the descriptions and figures of three out of 
these four forms have been collected at the Queen Charlotte 
Islands, and two at the Iltasyouco River and Sigutlat Lake. 
4. Astarte Packardi White. Dr. White admits that, as far 
as external shape and surface markings are concerned, it 1s 
scarcely practicable to separate the British Columbia and 
ueen Charlotte Island specimens from this species, but says 
that the hinge and interior markings of the type of A. Packard: 
are unknown. In this genus, as every experienced malacolo- 
gist is aware, the interior of the valves affords a certain indica 
tion of its generic relations but is of very little assistance 1D the 
determination of species. 
rammatodon inornatus Meek and Hayden. Dr. White 
says that ‘‘ Mr. Whiteaves’ specimens do not show the hinge. 
parallel to the hinge line, just asin Meek’s figure of G. cnornatus 
on plate 3, fig. 9b, of the “ Paleontology of the Upper Mis- 
souri, 
6. Modhiola ( Volsella) subimbricata Meek. The specimens from 
the Queen Charlotte Islands referred to this species, though 
somewhat distorted, are nearly perfect single valves. © 
White does not comment at all on the real or supposed ident- 
fication of a Sigutlat Lake specimen with the Modiola (or Vol: 
sella) formosa of Meek and Hayden, one of the strongest points 
in the writer’s view of the case. At the Iltasyouco River, 10% 
specimens have been found which are very difficult to distin- 
guish from Modiola platynota White. ; : 
'. Pteria (Oxytoma) mucronata Meek and Hayden. Of this 
the writer is said to have only one imperfect valve and Dr. 
White adds ‘‘that the most that can be said of it is that 16 
apparently indicates a form which is much like the P. (?-) 
mucronata of Meek and Hayden.” In answer to this statement 
