088 PROCEEDINGS OF THE XATIOXAL MUSEUM. vol.xxiii. 



stratigraphic correlations. The Cambrian fauna of Sardinia is so dis- 

 tinct from that of other localities and the stratig-raphic succession of 

 the sul)fauna is so confused I think it luiwise to identify its species 

 with described species unless the material is so full and well preserved 

 that there can be no doubt of their spccihc identity. 



OBOLUS (LINGULELLA?) BICENSIS, new species. 



Shell small, general form of ventral valve broad ovate, with the 

 greatest width at the anterior third, from which there is a slightly 

 curved, quite uniform slope to the beak. Moderately convex. Length 

 of the one specimen known, 3 nmi. Surface marked by tine, concen- 

 tric striffi and ver}' slight undulations of growth: also tine radiating 

 strife. The shell appears to have l)een thin, and formed of several 

 ver}" thin lamella, and marked on the interior by lino punctaj. 



Olm-rvaflons. — This small species is known only by one specimen 

 and its matrix that I found in a limestone bowlder of the conglomerate l 

 at Bic. It is associated with fragments of Olenellus and Agraulos. In I 

 form the ventral valve recalls DtceUoinu-'< jxil itus. It is probable that] 

 if a number of specimens were obtained it would not be found to differ 

 from typical forms of Obolus and its subgenus Lingulella. 



Formation and locality. — Bowlder containing Lower Camljrian fos- 

 sils, Bic conglomerate, eastern point of Bic Harbor. Province of Quebec, 

 Canada. 



OBOLUS (LINGULELLA) LINNARSSONL new species. 



Ventral valve elongate oval, subacuminate. Surface marked by fine, 

 undulating, depressed, radiating, ridge-like lines; closely undulating, 

 concentric stride; and very fine papillae that appear to terminate in 

 fine, sharp points; the papilla are situated on the narrow, irregular, 

 elevated spaces between the stria\ Shell relatively thin and formed 

 of several lamellae more or less oblique to the outer surface. 



Ohservations. — This species is based on a fine specimen of a ventral 

 valve associated with Ort/u's lindstni/j/i in the Paradoxides series of 

 Lovened. It is broader than 0. (Z.) ferrugineu><^ and the surface 

 ornamentation is quite different. The latter is more like that of the 

 associated Acrothele coriacea. In outline it approaches more nearly to 

 O. (Z.) lepis. 



Formation and JocaJity. — Middle Cambrian. Lovened, Westrogo- 

 thia, Sweden. 



OBOLUS (LINGULELLA) RANDOMENSIS, new species. 



General form elongate ovate; ventral valve rather l>roadly suliacu- 

 minate, and 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 

 moderate and uniform and nearlv the same in each. Surface of the 



