[WILLIAMS] FOSSIL FAUNAS OF THE ST. HELEN'S BRECCIAS 217 



7, OrtliotheteSj cf. Woolworthana, Hall. 



This is a somewhat distorted brachial valve presenting the bulging 

 convexity in front, flattened towards the umbo, and is identified on its 

 external form, evidence of internal structure being wanting. 'The speci- 

 men furnishes nothing diagnostic of horizon further than resemblance 

 to the forms found in the limestone of lot 2, with which specific identity 

 may be inferred and continuance of the race with not marked divergence 

 in characters. 



8. Clionetes hudsonicus meiatype gaspensis, Clarke. 



This species is represented by two imperfect specimens : ( 1 ) a mold 

 of the exterior of a brachial valve showing the surface plications and the 

 cardinal process, and (3) the portion of the left side of a pedicle valve 

 showing the plications and the edge of the ridge following the teeth out- 

 ward and bounding the muscular depression. Both specimens are of 

 approximately the same size : i.e., 20 mm. wide by 12.5 mm. long. This 

 is nearly the dimensions of the specimens figured by J. M. Clarke from 

 the Gaspé sandstone (York Eiver beds) of Gaspé. 



A larger series of the same species from the same kind of rock found 

 in a boulder on the island Côte St. Paul furnishes fuller expression of 

 the characters : viz. 



One of the specimens (ISTo. 8 of tablet A) shows on the right side 

 of the centre of the hinge-area the characteristic denticulations of the 

 hinge of Eodevonaria. This specimen is very similar in size and general 

 expression to figure 7 of plate 45 of Clarke's Monograph on the Gaspé 

 faunas. There is considerable difference in convexity among the pedicle 

 valves, but none are strongly convex and some are quite low-convex. 

 They thus differ from C. coronata. Hall, which, in general aspect of the 

 pedicle valvefe, they resemble. C. coronata has a fuller central umbonal 

 upward arching and a more decided downward cu,rve along the centre 

 toward the front. Specimens of C. gaspensis show a much broader cur- 

 vature, and in some specimens the line from the beak to front along 

 middle of the shell is but slightly bent. 



One specimen (iSTo. 5 of tablet A) shows blunt bases of cardinal 

 spines, indicating five or six on each side the beak. Several specimens 

 of pedicle valves (see tablet A, No. 4, 7, 10, 11, 13, 1 ) show a slight 

 sulcus near the middle (but generally not exactly in centre) of the shell. 



Associated with these pedicle valves are a series of nearly flat valves 

 of the same general size and surface markings which appear to be the 

 brachial valves of the same shell. They are nearly flat but the large 

 specimens are slightty concave, and several of them show the irregular 

 folding along the central region, corresponding to the sulcus of the pe- 



