556 DEVONIAI^ AND SILTJEIAN OSTEACODA FROIM NORTH AMERICA, ETC. 



Fig. 8. Strcj)nIa2)lanfaris,s-p.noY. «, left valve, outside ; i, inside. Eighteen- 

 mile Creek, Lake Erie, N.Y. 

 9. Moorca Kirkhtji, sp. nov. a, left valve ; cast (here the furrovs^ is 

 stronger than the ridge) ; h, edge profile. Ontario Co., N.Y. xl5 

 diam. 



10. . a, left valve ; cast (here the ridge is stronger than the 



furrovr inside it) ; /;, edge profile. Ontario Co.. N.Y. X 15 diam. 



11. Primitia Clarkei, sp. nov. Right valve, cast. Ontario Co., N.Y. 



X 15 diam. 



12. Bollia bilohata, sp. nov. Left valve ; cast, with one lobe and the junc- 



tion much worn. Ontario Co., N.Y. X 15 diam. 



13. Eurychilina reticidata, Ulrich. a, convex cast of the inside of a left 



valve; b, hollow cast of the outside of the same individual valve. 

 Ontario Co., N.Y. X 10 diam. 



14. Beyrichia reticulata, Bornemann. a, convex cast of the inside of a 



right valve (taken with gutta-percha) ; h, hollow cast of the outside 

 of another valve. Sardinia. X 7 diam. Reproduced from careful 

 tracings of the four original figures ; for these I am indebted to the 

 kindness of Chev. W. P. Jervis, F.G.S., of Turin. (Fig. 14 a is 

 " fig. 3," and fig. 14 i is " fig. 2 6 " of the originals.) 



EXPLANATION OF PLATE XXI. 



Silurian Ostracoda, with one (fig. 1) Devonian. 



Fig. 1. Beyrichia Kloedeni, M'Coy. Variety, a. right valve, with hypertrophy 

 of the antero-ventral lobe ; h, ventral view. Ontario Co., New-York 

 State. x7 diam. 



2. Beyrichia Guillieri, Tromelin. a, left valve, cast ; i, ventral view ; c, 



front view. Domfront, Brittany. X 20 diam. 



3. Bairdia anticostiends, sp. nov. a, right valve; h, ventral profile. 



English Head, Anticosti. Xl5 diam. 



4. Bythocypris ? ohtusa, sp. nov. a, right valve ; h, ventral profile. 



English Head, Anticosti. xl5 diam. 



5. Macrocyjjris'^ stcbcylindrica, st^. hoy . a, right valve ; Z), ventral profile. 



English Head, Anticosti. X 15 diam. 



6. Poll/cope suble7iticnlaris, sp. nov. a, right valve; b, ventral profile. 



English Head, Anticosti. X 15 diam. 



7. Beyrichia diffis&a, sp. nov. Left valve. Jupiter River, Anticosti. 



Xl5 diam. 



8. LeperditiafrooitaUs,s\).xiOY. a, right valve ; 6, ventral profile. Near 



the Jumpers, Anticosti. x4 diam. 



9. Bollia scmihincda, sp. nov. a, left valve ; h, ventral view. South of 



Junction Clifi^, Anticosti. X 25 diam. 



10. Primitia Billivgm, sp. nov. Right valve. West of Jupiter Road, 



Anticosti. X 15 diam. 



11. Bythocypris ? Lindstroemii, sp. nov. a, right valve ; b, edge view ; 



c (G c on the Plate), end view. S. of Junction Cliff, Anticosti. 

 X 25 diam. 



Discussion. 



Dr. HiNDE wished to express the obligations of geologists to 

 Prof. Jones for the excellent work which he had done amongst the 

 3^]ntomostraca ; and particularly on the present occasion, for the 

 clear manner in which he had explained the wide distribution of 

 some of the species. 



The President alluded to the long years of arduous labour which 

 Prof. Jones had bestowed on these minute fossils, and to the inter- 

 esting results he had obtained from them. 



