300 



the figures given by d'Orbigny and Pictet, I should say that on your 

 specimen the interspaces between the principal ribs are flatter and bear 

 more nearly equal, finer and much more numerous radiating strife. The 

 concentric sculptiire is also apparently much less distinct." 



In this connection it may be said that the reference of the Devil's Lake 

 specimens to the A. Corriueliana of the French and Swiss Neocomian has 

 has not proved satisfactory, and it will be convenient to designate the 

 former by the new specific name Avicula ( Oxytoma) McConnelli, in honour 

 of their discoverer. The Maud Island specimen represented by fig. 6 a of 

 Plate 33 is probably specifically identical with A. McConnelli, but is 

 much too imperfect to admit of a satisfactory comparison with the types 

 of that species. 



Pecten Meekanus. 



Syncyclonema Meekiana, Whiteaves. 1870. This volume, pt. 1, p. 82, fig. 9. 



East end of Maud Island, two specimens ; and south side of Alliford 

 Bay, one specimen : C. F. Newcombe, 1895. 



Gryph^ea persimilis. (Nom. prov.) 



Gryphcea Nehrascensis, Whiteaves. 1884. This volume, pt. 3, p. 244, pi. 32, figs. 2 and 

 2, a-h. But apparently not O. calccola, var. Nehrascensis, Meek 

 & Hayden, 1861, which is said to be a Jurassic species. 



Shell of medium size, v^ariable in shape but usually irregularly elongate 

 subovate or ovately subtriangular : front margin, or inferior border, 

 often unequally bilobate. Lower valve deep, either uniformly convex, or 

 impressed with a comparatively distinct submedian longitudinal sulcus, 

 so that the front margin is concavely sinuated near the middle, lobate on 

 both sides, somewhat elongated or produced anteriorly, — and sometimes 

 with a much fainter, lateral and presumably anterior but otherwise 

 somewhat similar sulcus. Umbonal region of the lower valve tumid, the 

 umbo itself strongly incurved, the beak acute and entire in some speci- 

 mens, but truncated and showing a small scar of attachment in others. 

 Upper valve small, concave externally, with comparatively inconspicuous 

 umbo and beak. Cardinal area not clearly exposed in any of the speci- 

 mens that the writer has seen. 



Surface of some specimens marked only by numerous and closely dis- 

 posed concentric lines of growth, but in others the umbo of the lower or 

 convex valve is marked also by numerous and equally closely disposed, 

 small, irregular and subparallel, longitudinal raised lines. Hinge dentition 

 and muscular impressions unknown. 



Maximum length of the largest specimen that the writer has seen, sixty- 

 eight millimetres. 



