108 G. F. MATTHEW ON THE 



the sides terminating in front in two small prominent eyelobes, close to the rounded 

 anterior corners of the glabella. Posterior marginal fold narrow. Dorsal suture in front 

 the eyes short, arched forward around the head ; behind the eyes long, arched outward 

 and then backward to the posterior margin. 



Movable cheek lunate, about one-half times longer than wide; acuminate in front, 

 rounded behind ; bordered by a wide marginal fold, increasing in width behind. 



Thorax. Only six joints of the rachis are known. The rachis is elevated, rings 

 narrow. One pleura preserved is short, broad, and has a diagonal furrow. 



Sculpture. The surface of the crust is smooth. 



Size. Middle piece of the head shield. Length 5| mm., width 8 mm. Movable 

 cheek. Length 6 mm., width 2 mm. 



Horizon and Locality. Same as the preceding species. 



This species is near C. micropygns, Lnrs., of the Megalaspis Limestone of Sweden,' but 

 differs in its smaller size and rounded front of the middle piece of the head-shield ; the 

 glabella also is rounded in front, the fixed cheek wider and the movable cheek narrower. 

 C. micropygus has 12 joints in the thorax. 



The figure of Bathyurus parvulus, Bill., of the " Potsdam " limestone of l'Anse au Loup ^ 

 resembles that of the young of this species, but the position of the eyelobeas described in 

 the text prevent us from regarding it as a Cyclognathus. 



EULOMA sp. ? 



A species of this genus seems indicated by several small, movable cheeks. The head 

 occurring with them is not sufficiently well preserved to determine whether the species 

 belongs to Euloma or Oonocephalites. 



Explanation of Plate. 



Fig. 1. — Bryograptus patens, n. sp. — a. Base of a hydro showing crossbars on some branches and hydro- 



tbecEe on otherB— 6. Two young individuals showii. /the habit of growtli — c. Branch showing cells. All 



natural size— d. The same mag. ? to show the cells. From Div 36, Navy Island, St. John Harbour. 



See p. 95. 

 Fig. 2. — Clonograpius (?) spinogus n. sp.— a- Branch of natural size — h. Same enlarged f to show the cells — From 



Div. 36, Navy Island. See p. 97. 

 Fig. 3. — OrOiM Elcctra, Bill., var. major n. var. — a. Ventral valve, decorticated at the umbo — 6. Dorsal valvo 



similarly decorticated— c. Cross section of the two valves. All natural size- From Div. Zd at Suspension 



Bridge. See p. lOO. 

 Fig. i.—Orthis nrthambonitei', Pander. — Ventral valve, mag. IJ— From Div. 3d, Suspension Bridge. See p. 101, 

 Fig. b.—Orthis Euryone, Bill. I var.— Ventral valve decorticated at the umbo, mag. f— From Div. 3d, Suspension 



Bridge. Seep. 101. 

 Fig. G.—Orthis Mcnapiœ, Hicks. ? var. — a. Ventral valve— 6. Dorsal valve. Both of the natural size— From Div. 



Sd Suspension Bridge. See p. lOl. 

 Fig. l.—Orthis Carausii, Salt. ? —a. Ventral valve— 6. Dorsal valve, decorticated at the umbo. Both magnified f — 



From Div. 3a at Navy Island. See p. 102. 

 Fig. 8. — Strophomena atava n. sp.— a. Ventral valve — b. Dorsal valve, decorticated at the umbo — c. A large ventral 



valve, decorticated at the uiubo— d. Interior of the ventral valve — e. Section of the tvv'o valves- All 



natural size — f. Enlargement of the surface to show the ribs. Mag. f — From Div. 3a at Navy Island . 



See p. 103. 



' Die Silurischen Etagen 2 und 3, p. iii. PI. i., fig. 3 a — c and 4. 

 '' Palœozoic Fossils, vol. I., p. 16, fig- 21, p. 15. 



