193 



Sculpture. A very fine concentric striation is visible on some valves. 



Size, Usual length, 3 mm. ; (largest, 3 mm.); width 2J mm. ; 

 (largest, 2 mm.) 



Horizon and locality. Gray shale of Assise C., 3 c,., at McLeod brook, 

 Boisdale, N.S. 



This species is nearly as large as Lingulella linguloides of the Lower 

 Paradoxides beds near St. John, a species which we would also refer to 

 Leptobolus. The outline also is similar, but the umbo of the ventral is 

 weaker ; this and the smaller size may be due to a more pelagic habitat. 



LINGULEPIS STAERI, var. PI. XIV., figs. 2 a-c. 



Lingulella gregwa Walcott [non mihi] Proceed. U. S. Nat. Mus. Variety of 

 Cambrian Brachiopoda, vol. xxiii, pages 669-695, [description without Starri Mr 



The following is Mr. Walcott's description of this form under the name 

 of Lingulepis gregwa. The diagnosis is arranged &3 nearly as possible, 

 according to the plan followed in this report. 



" General form elongate ovate, with the ventral valve acuminate and 

 dorsal valve ovate triangular in outline. The outlines of the valves vary 

 as shown by a series of specimens. The convexity of the valves varies 

 with the conditions of preservation. Those from the sandstone are rather 

 strongly convex, while in the shale they are very much compressed. On 

 the dorsal valve of most young shells there is a marked and a rather broad 

 shallow sinus, extending from the umbo to the front, where it flattens 

 out. 



Interior. The plane of the cardinal area of the ventral valve is nearly 

 coincident near its edges with the edge of the shell. The area is long 

 and extends well forward on the cardinal slope. It is divided midway 

 by a narrow, rounded, deep pedicle furrow, and about halfway between 

 the pedicle furrow and the lateral margins, by an unusually well defined 

 flexure line, which is in line with the main vascular furrows of the interior 

 of the valves ; fine striae of growth cross the area, and arch around the 

 pedicle furrow, parallel to the base of the area. There is practically no 

 undercut beneath the area, except near the flexure line at the front mar- 

 gin of the area. The area of the dorsal valve is short and narrow, and 

 crossed by fine lines of growth parallel to its base. 



The cast of the visceral cavity in the ventral valve, shows it to have 

 been relatively small, and usually confined to the posterior half of the 

 shell. There is no trace of a median septum in the ventral valve ; in the 

 13c. R. 



