﻿12 Bulletin 18 38 



Asaphus canalis (?) Conrad. 



Isoletes canalis, Pal. N. Y., Vol. i, 1847, p. 25, pi. 4 bis., figs. 17-19. 



Asaphus canalis, 12th Report N. Y. State Cabinet, p. 70. 



Asaphus canalis, Am. Mus. Nat. His. Bull., Vol. 1, No. 8, 1886, p. 336, 



pi. 34, figs. 1-8. Ibid., Vol. 11, No. 2, 1889, pp. 64, 65, pi. 11, 12. 

 Asaphus canalis (?), Am. Pal., Vol. 3, Bt;ll. 13, p. 16, pi. 16, fig. 7. 



This trilobite, as far as we can judge from our collections, has 

 a greater distribution vertically and geographically than any 

 other species in the Mohawk Calciferous. 



Distribution. — At Tribes Hill it occurs in a bed 90 feet below 

 the Trenton and in several horizons to within a 

 few feet of the contact with the Trenton. 

 Geographically, it extends from Little Falls 

 throughout the Mohawk and is reported from 

 the Lake Champlain region. 



. PHYLLOPODA. 



Ribeiria. 



The uncertainty which has existed regarding the relationship of 

 this genus has been cleared up by the recent investigations of 

 Schuchert and Waagen.* According to these investigators 

 Ribeiria is a crustatie« which is closely related to the modern 

 Apus and is placed in the family Apodidce and order Branchiopoda 

 of the Phyllopoda. 



Ribeiria turgida sp. nov. PI. 3, Figs. 6, 7. 



A variable species but one very distinct from R. nuculitiformis 

 was found, more or less abundantly, in several localities in the 

 Mohawk Valley. The following is the description of these spe- 

 cies : Carapace small, equilateral; the largest about 9 mm. in 

 height and 12 mm. in length. Sides very convex. None of the 

 specimens preserve the carapace. In the cast a deep notch ex- 

 tends obliquely posteriorly toward the ventral side. Dorsal mar- 

 gins straight or slightly curving. The ventral margin is almost 

 semi-circular in outline. This species differs from R. nuculiti- 

 formis in its strong convexity and in being equilateral. 



*Dr. R. J. Schuchert and Dr. D. L. Waagen "Jahrbuch der K. K. 

 geolog." Reichstalt, 1903. Bd. 53, Heft. 1. Pp. 33-50. Taf. 1. 



