Ravmond : Brachioi'oda and Ostracoda of thk Chazv. 249 



Description. 



Pedicle \'alve strongly convex, area high. The outline of the shell 

 is subquadrate, the greatest width at the hinge, and the cardinal 

 extremities slightly alate. There is a narrow but 

 deep median sinus, in which there is one plication. 



Brachial valve with a shallow median sinus con- 

 taining two plications. The valve is slightly convex 



° ^ ... I'IG. 24. Or- 



and has about twenty sharp plications which are thidium lamel- 



crossed by strong concentric lamella?. An average losum Raymond. 



specimen is 3 mm. long, and 5.5 mm. wide. The A well preserved 



specimens are all separated valves and the figured brachial valve 



... , . , , 111 T^i supposed to be- 



pedicle valve is to be taken as the holotype. Ihe , , . 



^ _ . long to this spe- 



interior of the shell is unknown, and therefore its (.jgg^ y , 



reference to the genus Or thidium is based on exter- 

 nal characters only. 



Locality. — Rather common at X'alcour Island, and less so at Chazy 

 and at Crown Point, New York. The holotype is from Sloop Island. 



Family PORAMBONITID.E Davidson. 



Genus Camerella Billings. 



33. Camarella longirostris Billings. 



(Plate XXX\'I, figures 29. 30.) 



Camarella longirostra Billings, 1859. Canadian Naturalist and Geologist, \'ol. 



IV, p. 302, p. 445, fig. 23. 

 Camarella longirostra Billings. Geology of Canada, p. 127, fig. 63. 

 Triplecia gracilis R.wmond, 1902. Bulletin American Paleontology, \'ol. Ill, 



P- 303. fig- I. PI- 18. 



Triplecia gracilis Raymond was based on a large and well preserved 

 brachial valve and a mutilated pedicle valve of Cameralla longirostris. 

 Camarella longirostris and C. parva differ widely from the Camarella 

 volborthi of the Black Ri\er. Specimens of the latter, which is the 

 type of the genus, ha\"e the ventral beak short and incurved, while 

 the beak of the pedicle \al\e of Camarella longirostris is extended, 

 and straight. 



Description. 



Outline triangular, longer than wide, the beak of the pedicle vaKe 

 attenuate and projecting some distance beyond the beak of the oppo- 

 site valve. The brachial valve has a short, prominent fold, and the 



