359 



Professor Tuomey couchided that Morton's types represented two 

 distinct species, and named the more elongated form represented by the 

 annexed cut I. gihhus, regarding the other as the true J. Barahini. At 

 one time, I was inclined to think that this arrangement might be admis- 

 sible in case Morton had included two types, and that they were both 

 good species. A more attentive reading of Morton's description, how- 

 ever, seems to me to show that he rather regarded the elongated or more 

 oval form as the typical one, not only because he first refers to it in 

 connection with the name I. Barahini, but because he describes that 

 species as "obliquely-oval", which would not be applicable to the 

 rounder form represented by figures 2 and 2 a of our plate 3. That the 

 Vancouver shell under consideration may be identical with the latter, I 

 am inclined to believe; but still the question remains an open one 

 whether either can be properly regarded as I. Cripsii. 



In originally studying the form under consideration, I proposed to 

 call it 1. siibundatus ; but, after seeing how widely I. Ct-ipsii is supposed 

 to vary by European authorities, I have concluded to refer our shell to 

 it as a variety siibundatus. Figure 3 of our plate 3 represents a speci- 

 men of somewhat different outline ; still I think it belongs to the same 

 species sh figure 1 of the same plate. 



Locality and position. — Sucia Islands ; Cretaceous. 



Inoceramus — ? 



Plate 1, fig. 6. 



This is also a rather compressed left valve of an ovoid or subcircular 

 shell, with a straight hinge, api)arently about equaling half its entire 

 length. It may possibly belong to the same species as the two forms 

 already described, though it possesses stronger and more irregular as 

 well as sharper concentric folds, and has a more obtuse beak, with a more 

 regularly-rounded posterior margin. As it came from a different local- 

 ity, however, and was found associated with an entirely different group 

 of fossils, the probability is it belongs to a distinct species. Still the 

 specimen is too imperfect to be positively identified with any known 

 species, or described with any degree of confidence as new. 



I was at first inclined to think either this shell or the last might pos- 

 sibly be the more compressed valve of Inoceramus Vancouvere7isis, Shu- 

 mard ; but on examining more carefully his description in the Transac- 

 tions of the Saint Louis Academy, I find the specimen described by him 

 is also a left valve, and has a very gibbous, elevated beak. This being 

 the case, none of the forms in the collection before me can, I think, be 

 properly referred to that species. 



Locality and position. — Nauaimo, Vancouver's Island; Cretaceous. 



Genus TRIGONIA, Bmgui^re. 

 Trigonia Eyansi, Meek. 



Plate 2, figs. 7, 7 a. 7 b. 



Triijoitia Evansi, Meek (1657), Trans. Albany lust., iv, 4'2. — Gabb (1864), Califoiuia Geo- 

 logical Report, i, 1S9, pi. 25, fig. 17, 



Shell arcuate-sulTtrigonal, gibbous anteriorly, contracted, cuneate, 

 and slightly gaping behind; ventral margin deeply rounded in outline 

 in the middle ; anterior side verv short, rounding up nearly vertically 

 No. 4 G 



