530 CAMBEIAN BEACHIOPODA. 



LiNGULELLA RANDOMENSIS (Walcott). 



Plate XXI, figures 5, 5a. 



Obolus (Lingulella) randomensis Walcott, 1901, Proc. U. S. Nat. Mus., vol. 23, pp. 688-689. (Described and discussed 

 as below as a new species.) 



General form elongate ovate; ventral valve rather broadly subacuminate, and the dorsal 

 valve slightly acuminate. The widest portion of the valves is the anterior third, from which 

 they very gradually narrow toward the cardinal slopes. The convexity of the valves is mod- 

 erate and uniform and nearly the same in each. Surface of the shell marked by fine concentric 

 striaB, and rather strong lines of growth, also fine radiating striaj. The shell is formed of a few 

 thin lamella or layers, as far as can be determined from tlie fragments preserved on the casts 

 in the sandstone. The longest ventral valve in the collection has a length of 10 mm. with a 

 maximum width of 6 mm. The dorsal valve is slightly shorter. 



As shown by the interior cast the area of the ventral valve is rather long, and extends 

 well forward on the cardinal slopes. It is divided at the center by a narrow pedicle furrow 

 and midway by a very slight flexure line. The base of the area curves backward over the 

 margin, arclfing slightly forward before reaching a rather deep indentation at the center. The 

 strife of growth cross the area parallel to its base. They are very sharp and fuie and quite 

 uniformly distributed over the area. Ai-ea of the dorsal valve unknown. 



Observations. — This pretty species occurs in great numbers in thin layers of brown sand- 

 stone embedded in a dark shale a short distance below the Olenus zone. In form it resembles 

 Lingulella mosia osceola (Walcott) (PI. XVIII, figs. 2 and 2c). It diff'ers from it in having a 

 narrower pedicle furrow and, when comparing a large number of specimens, in being slightly 

 more elongate. It is proportionately narrower toward the beak. 



The species derives its specific name from its occurrence on Random Island. 



Formation and locality. — Upper Cambrian: (6y) Sandstone on north side of Random Island, between Birch 

 and Sandy points. Smith Sound, Trinity Bay, Newfoimdland. 



I Lingulella rotunda (Matthew). 



Plate XXXVII, figures 3h-k. 



Lingulepis rotunda Matthew, 1903, Geol. Survey Canada, Kept. Cambrian Rocks Cape Breton, p. 199, PL XIV, 

 figs. 4a-f. (Described and discussed as a new species.) 



This small species is marked by its nearly circular, convex dorsal valve. The inner 

 surface of the shell is strongly punctate, but I could not find the minute tubercles on the 

 outer surface of the dorsal valve described by Matthew. The outer surface, where preserved, 

 appears to be smooth or marked by concentric strise. 



Formation and locality. — Kiddle Cambrian: (325a [Matiheio, 1903, p. 199]) Shales of Division C2c of Mattheio's 

 [1903, p. 49] Bretonian, on the eastern slope of the valley of McNeil BrooTc, on the road to Trout Brooh, in the Mira River 

 valley; (31) in compact, fine-grained, thin-bedded, gray sandstone, of the Paradoxides zone, on McLean Brook, 1 mile 

 (1.6 km.) east of McCodrum Brook, and 1.5 miles (2.4 km.) west of Marion Bridge; and (325c) sandstone on the shore 

 of Bras d'Or Lake; all in eastern Cape Breton, Nova Scotia, Canada. 



,/ Lingulella schucherti (Walcott). 



Plate XXI, figure 6. 



Obolus (Lingulella) schucherti Walcott, 1901, Proc. U. S. Nat. Mus., voL 23, pp. 689-690. (Described and discussed 

 as below as a new species.) 



General form elongate ovate, ventral valve subacuminate and the dorsal valve elongate 

 ovate in outline. Surface marked by fine concentric striae, and rather strong concentric undu- 

 lations or lines of growth ; also fine radiating striae, and on some specimens indistinct, radiating, 

 rather narrow, depressed furrows. 



