OBOLID^. 



537 



p. 79]) sandy layers in the shales of Division Ele; and (lOp) sandstone just below the waterfall in Division E2b; all 

 in Matthew's [1903, p. 21] Etcheminian, on Dugald Brook, Indian River Valley, eastern Cape Breton, Nova Scotia. 

 (307d [Matthew, 1903, p. 79]) Sandy limestone of Division E2a? of Matthew's Etcheminian, on Young (McFees) 

 Point, George River, Cape Breton, Nova Scotia. 



FiGlTEE 44. — Lingulella triparilis (Matthew); outlines illustrating variation in form of shells now referred to Lingulclla tripariUs. a, a', Ventral 

 and dorsal valves of " Obolus (Eooholns) discus" [Matthew, 1903, PI. VIII, figs. 3a and 3c]. b, b', Ventral and dorsal valves of Lingulclla 

 triparilis [Matthew, 1903, PI. VIII, fig. 4a, and PI. IX, fig. la], c-g, c'~g' , Ventral and dorsal valves from LoDaUty 13t", sandstones of Division 

 Elc of Matthew, Dugald Brook, illustrating the gradation in form between shells referred to L. triparilis and " L. longovalis." h, h', Ventral 

 and dorsal valves of "i. longovalis" [Matthew, 1903, PI. VII, figs. 3b and 3d], i-l, i'-V, More elongate ventral and dorsal valves from speci- 

 mens associated with those represented by c-g. 



Lingulella tumida Mattlaew. 



Plate XXIV, figures 7, 7a-d. 



Lingulella tumida Matthew, 1899, Bull. Nat. Hist. Soc. New Brunswick, vol. 4, pt. 3, No. 18, p. 200, PI. I, figs. 2a-c. 

 (Described as a new species.) 



Oholus [Lingulepis) gregwa Walcott (in part) [not (Matthew)], 1901, Proc. U. S. Nat. Mus., vol. 23, p. 692-694. (Mat- 

 thew's Lingulella tumida is here referred to and described with Lingulella {Lingulepis) gregwa.) 



Lingulella tumida Matthew, 1903, Geol. Survey Canada, Rept. Cambrian Rocks Cape Breton, p. 123, PL VI, fio-s. 

 6a-c. (Described and discussed. Figs. 6a-c are copied from Matthew, 1899b, PI. I, figs. 2a-c.) 



This sliell resembles Lingulella martinensis Matthew and some forms of Lingulella (Lin- 

 gulepis) exigua (Matthew) in outline of the valves. At first I thought it should be placed with 

 the latter species, which I had [1901, p. 692] by error identified with Lingulella (Lingulepis) 

 gregwa (Matthew). It is uniformly smaller than L. (L.) exigua, and differs in the more uniform 

 concentric lines and striae of growth. 



