WHITEAVES.] LARAMIE AND CRETACEOUS INVERTEBRATA. -15 



Surface markings of the test unknown, but the cast of the interior of 

 the valves is marked by faint broad undulations. On a minute frag- 

 ment of the test which happens to be pre>erved, there are indications 

 of raised concentric ^triations. 



Dimensions of the only sf)ecimen collected : Length, seventy-six 

 millimetres (or about three inches) ; height, inclusive of the beaks, 

 iifty-five mm. ; maximum thickness through the closed valves, thirty- 

 five mm. 



Four miles south of Battle Paver, Township 38, between Eanges 12 

 and 13, we^t of 4th Meridian, J. B. Tyrrell, 1884: one cast of the 

 interior of the united valves. 



An apparently well marked species, characterized principally by its 

 regularly inflated valves and its transversely broad suboval form, also 

 by the abrupt contraction of its narrowly gaping posterior margin, 

 and by the angularity of its anterior margin aljove. 



Pieces of fossil wood which are completely riddled with the burrows 

 of a species of Terolo or Turnui were collected by ^Ii-. Tyrrell at the 

 same locality and date as Panojxra suboval is. The posterior termination 

 of each of these burrows is sphffirical in form, but as the shape and 

 sculpture of the valves of the mollusk which made them are unknown, 

 it is imi)0^sible to say to what species or even to what genus they 

 should be refen-ed, 



CtASTEEOPODA. 



Hajiinea occidextalis, ileek and Hayden. 



Sulla occideniali^ Meek and Hayden. IS.5IJ. Proc. Ac. ^'at. Sc. Phil., vol.. 



VIII., p. 69. (Xot B. owidoitiiUs, A. Adams, of earlier date.) 

 Svlla Xel/rascensiK, Meek and Hayden. 1861. Proc. Ac. Isat. Sc. Phil., vol 



XIIL, p. 427. 

 Saminea occldeniolis, Meek. 1876. Eep. T.S. Geo!. Surv. Terr., vol. IX., p. 271, pi. 



IS, figs. 11a, b, and 12a, b. 



Blood Indian Creek, north of the Bed Deer Eiver and twenty miles 

 east of the Hand Hills, Prof ilacoun, 1870: one well preserved ca.,t 

 of the interior of the shell. South Saskatchewan, opposite Swift Cur- 

 rent Creek, E. G. McConnell, 1882 : a similar cast. Old Wives Creek, 

 Township 10, Eange 11, west of 3rd Principal Meridian, E. G. McCon- 

 nell, 1884 : four specimens, two of them with large portions of the test 

 well preserved. 



A cast of the interior of the shell of a very narrowly cylindrical 



