96 CANADIAN MICRO-PALEONTOLOGY. 



size, reticulation, tubercles, and smoothness of ends (nothing of the last 

 in the very young state ; length -9, height -5 mm.), is mentioned at 

 page 28 of the February number of the Quart. Journ. (leol. Soc, 1890. 



Some interiors of small valves of Primitiopsis punctuUfera are shown 

 on one of the pieces of grey limestone (composed of small brachiopods, 

 &c.) from the same place. They are 1-25 mm. long, and '75 mm. 

 high, and not full grown, but rather larger than fig. 7, pi. ii, Q. J. Gr. 

 S., February, 1890. They show distinctly that the front border is 

 bevelled inwards, the ventral edge of the right valve is somewhat in- 

 turned at its hinder moiety, the posterior edge is thin, and the dorsal 

 edge straight, with a simple groove along its length, slightly over- 

 lapped by the outside edge of the valve brought over at the middle. 



From the Hamilton group, at Thodford, Ontario. Collected by 

 Dr. G. J. Hinde, F.C; .S. 



9. KiRKBYA (?) Walcotti, Joncs. 

 PI. 11, figs. 12 a, 12 b. 



Primitia (?) Walcotti, Jones. Quart. Journ. Geol- Soc, vol. XLVl, p. 543, wood- 

 cut, fig. 1. 



Length -95 (imperfect), height -4*7 mm. 



This imperfect, but very interesting specimen, is far more nearly 

 related to some forms of Kirkbya, such as K. costata (McCoy), Ann. 

 Mag. Nat. Hist., ser. 5, vol. XV, 1885, pi. iii, fig: 13, than to Primitia, 

 to which genus it was at first referred with doubt. G-radations from 

 the ribs of K costata, as shown by K. Scotica, figs, lli and 17, of the 

 same plate *, lead towards such obliquely anastomosing, close set, and 

 tortuous riblets or wrinkles as seen in the specimen under notice. 



This is, unfortunately, broken at one end and partly buried along 

 the edges. It has a central pit, and is elegantly ornamented with nar- 

 row curved ridges and furrows (of about equal width). These are nearly 

 straight, and somewhat inosculating on the dorsal, tortuous and inter- 

 rupted on the ventral region. Small pits occur here and there along 

 the furrows, as if marking obsolete meshes. 



This was named as a species in honour of C. D. Walcott, F.CI.S., of 

 Washington,. U.S., who has discovered and described several very 

 interesting forms of North American Ostracoda. 



From the Hamilton group at Thedford, Ontario. Collected by Dr. 

 G. J. Hinde, F.G.S. 



• It may be mentioned that K. costata and its allies on the same plate tend towards Entomia, 

 while K. rigida and K. Urei (figs. 18 and 19) lead to Strepula. 



