542 PROF. T. R. JONES ON SOME DEVONIAN AND 



VII. MooEEA, Jones and Kirkby, 1867 & 1869. 



Moorect, Jones & Kirkby, ' Ann. & Mag. Nat. Hist.' ser. 4, vol. iii. 

 p. 225, and ser. 5, vol. xviii. p. 261. 



11. MooREA KiRKBYi, sp. nov. (PI. XX. figs. 9 a, b, & 10 a, h.) 



I^ig. 9 



10 



jengtb. 



Height. 



Thickness. 



mm. 



mm. 



mm. 



1-33 



•73 



•66 



1-2 



•6 



•48 



The species of Moorea that have been described in the papers re- 

 ferred to above have more or less of marginal ridges, as well on the 

 dorsal and ventral, as at or near the ends. The specimens which 

 we have from the Corniferous Chert of Ontario Co., New-York 

 State (Coll. Mr. J. M. Clarke), have ridges only at the ends of the 

 valve. Another form (Silurian), M. Smithii, Jones, op. cit. vol. xix. 

 p. 499, pi. xiii. fig. 11, has a median ridge forking at the posterior 

 region. 



Neatly suboblong with rounded ends, straight back, and nearly 

 straight ventral margin, these specimens, both an inner and an 

 outer cast, show that two nearlj^ equal curved ridges, each parallel 

 with its neighbouring margin, starting abruptly on the dorsal, and 

 dying away on the ventral edge, existed on each valve. 



This distinct, though simple, form deserves a specific name, and I 

 associate it with that of my valued friend and fellow-worker, Mr. J. 

 W. Kirkbv. 



Devonian Species from the Hamilton Formation at Thedford, 

 Ontario, Canada. 



The occurrence of numerous specimens of Primitiojjsis puncluli- 

 fera (Hall) in various stages of development as to size, reticulation, 

 tubercles, and smoothness of ends (nothing of the last in the very 

 young state ; length -9, height '5 mm.), is mentioned at page 2S of 

 the February No. of the ' Quart. Journ. Geol. Soc' 1890. 



Some interiors of small valves of Primitiopsis p)unctulifera are 

 shown on one of the pieces of grey limestone (composed of small 

 Brachiopods, <S:c.) from the Hamilton Group at Thedford, Ontario, 

 Canada. They are 1*25 mm. long, and -75 mm. high, and not full- 

 grown, but rather larger than fig. 7. pi. ii., Q. J. G. S., Pebruary 

 1890. They show distinctly that the front border is bevelled in- 

 wards, the ventral edge of the right valve somewhat inturned at 

 its hinder moiety, the posterior edge thin, and the dorsal edge 

 straight, with a simple groove along its length, slightly overlaj^ped 

 by the outside edge of the valve brought over at the middle. 



Also collected by Dr. Hinde, in the same locality, are two other 

 interesting small Ostracoda associated with them. These occur with 



