390 Trof. T. Rupei t Jones and Dr. H. Woodicard — 



Zeaia Leidyi, T. E. Jones, which occurs with Bellinuriis in these 

 Eiversdale black shales, occurs in the Lower Carboniferous of 

 Pennsylvania, but in rocks " regarded by some geologists as the 

 uppermost part of the Devonian or Old Red Sandstone." ^ Zeaia 

 also occurs in the Upper Coal-measures of Lancashire and the 

 Lower Carboniferous of Fifeshire (Jones, op, cit.). 



In his " Acadian Geology " (3rd edition, 1878), Sir William 

 Dawson gives an interesting account of the geology of Colchester 

 Co., Nova Scotia, and figures Zeaia Zeidyi (misspelt * Zeidii ') from 

 the Lower Carboniferous Coal Formation (see p. 256, fig. 78e). 

 At p. 258 he also gives a section at Walton which would seem to 

 justify the inclusion of the Red Rocks of Union and Riversdale in 

 the Lower Carboniferous Series, thus uniting these disturbed beds 

 in one group. But this suggestion is made with the utmost 

 diffidence, in the absence of a knowledge of the district. 



As the two specimens of Bellinurvs (PI. XV, Figs. 2 and 3) are 

 both imperfect, and better materials may at any time be forthcoming, 

 it seems prudent to refrain from suggesting more than one trivial 

 name. This Crustacean may therefore be known as Bellinuriis 

 grandcevus, Jones & Woodw., Lower Carboniferous Series, Rivers- 

 dale, Colchester Co., Nova Scotia. 



2. HiBBERTiA ORBICULARIS, gen. et sp. nov. (PI. XV, Fig. 4.) 



This small Crustacean shield, together with other specimens, was 

 presented to the British Museum, many years ago, by our late friend 

 Dr. John Millar, F.G.S., of Bethnal House, Bethnal Green. The 

 specimen is imbedded in a finely laminated, micaceous, non- 

 calcareous shale (bluish-grey in section), and bears the label "Coal M., 

 Burdiehouse." It was at first believed to be one of Dr. Hibberfc's 

 types from Burdiehouse, but nothing like this fossil was found to 

 ■have been figured or mentioned in Dr. Hibbert's memoir^ on the 

 strata and fossils of Burdiehouse ; therefore, its occuri'ence there, as 

 shown by its old label, is of great interest. It was reserved for 

 description with other Phyllopods to form part of a monograph 

 in course of publication by the Palseontographical Society ; but 

 upon further examination it was found to differ so markedly from 

 the other members of this division that it was held over for some 

 time for further consideration and comparison. It has now become 

 necessary to give it a name, and place it approximately among its 

 congeners. 



Specific Characters. — A nearly circular shield, 14 mm. broad by 

 15 mm. long, having an opening behind, bounded by two acute 

 incurved angular spines which form the backward extremities of the 

 concentric shield or buckler-like test. The periphery of the con- 

 centric part of the test is turned up sharply as a thin rim in the 

 fossil, leaving a uniform narrow groove behind it, from which the 

 field of the buckler rises with a gentle swelling over and along the 



1 " Fossil Estherife " : Pal. Soc. Mon., 1862, p. 117, pi. v, figs. 11, 12. 



2 See Dr. S. Hibbert's memoir, Traus. Koy. Soc. Edinburgh, vol. xiii (1836), 

 p. 280, plates. 



