OBOLID^. 539 



visceral area is well developed beyond the center of the shell, and the vascular sinuses are 

 farther out proportionately than in the dorsal valve. The central and anterior lateral muscle 

 scars are placed on an elevated central ridge, on each side of a sharp median septum. 



Ohservations. — This very pretty little shell occurs in great numbers in the dark argilla- 

 ceous shales with Redlichia noetlingi (Redlich). Redlich [1899, p. 7] states that it is the only 

 species of the genus in the collection sent to him. In the collections made by Fritz Noetling 

 I find associated ^vith Redlichia noetlingi, Lingulella wanniecki, L. fuchsi Redlich, Acrotliele 

 (Redlichella) granulata (Linnarsson) ; also specimens of a species of undescribed Hyolithes. 



Among the American species of Lingulella, L. wanniecki may be compared in form with 

 L. desiderata (Walcott) and L. oweni (Walcott). Its surface is much like that of L. wpis 

 (Walcott) and L. ora (Walcott). It is distinct from all described species when its form and sur- 

 face are taken into consideration, as there is no species with its subtriangular form that has 

 its granulated surface. 



The formations containing this fauna are referred to the Middle Cambrian, as there is no 

 evidence that the Cambrian fauna of India above the upper "Annehd sandstone," as described 

 by Noetling and Redlich, is older. 



Formation and locality. — Middle Cambrian: (15r) a Bark argillaceous shales at Khussak, Salt Range, India. 



Lingulella welleri (Walcott). 



Plate XXXVIII, figures 4, 4a-b. 



Obolus (Lingulella) welleri Walcott, 1902, Proc. U. S. Nat. Mus., vol. 25, p. 60S. (Described and discussed essen- 

 tially as below as a new species.) 



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

 subelliptical. Owing to the more or less crushed condition of all the specimens the exact 

 convexity of the entire valve is unknown. Surface of the shell marked by numerous elevated 

 concentric lines of growth and very fine slightly irregular interstitial concentric striae. 



Wlien the outer edge is exfoliated the inner layers show fine radiating striae and con- 

 centric lines of growth. Nothing is loiown of the interior surface of the shell. The shell 

 appears to have been relatively tliin and formed of several layers or lamellae. 



A ventral valve 14 mm. in length has a width of 9 mm. and a dorsal valve 10 mm. in 

 length has a width of 7.5 mm. In both valves the width is slightly increased by the flattening 

 of the shell. 



Ohsemations. — Tliis species occurs in association with Oholus ( Westoiiia) stoneanus (Wliit- 

 field) in an arenaceous, magnesian limestone. It differs from described species of Lingulella 

 in the elliptical form of its dorsal valve and the strongly fUose concentric striae of the outer surface. 



The dorsal valve has the outline of that of Oholus ( Westonia) stoneanus but the ventral 

 valve is more acuminate and the characteristic Westonia surface of the latter is absent. Some 

 specimens of 0. (W.) stoneanus have the transverse imbricating lines only on the posterior 

 half of the valve, in wliich case the anterior half is much like that of LAngulella welleri. 



The specific name is given in honor of Prof. Stuart Weller, who discovered the locality. 



Formation and locality. — TTpper Cambrian : (lie) Hardyston quartzite [Weller, 1900, pp. 10 and 12], O 'Donnell 

 and McManniman's quarry, Newton, Sussex County, New Jersey. 



Lingulella winona (Hall). 



Plate XVIII, figures 3, 3a-b. 



Lingula winona Hall, 1863, Sixteenth Kept. New York State Cab. Nat. Hist., p. 126, PL VI, fig. 9. (Described as 



a new species; see p. 540 for copy.) 

 Lingula winona Hall, 1867, Trans. Albany Inst., vol. 5, p. 102, PI. I, fig. 9. (Copied from preceding reference.) 



a Specimens from the type locality were given to the United States National Museum and this number was assigned to them. 



