58 



Prof. T. E. Jones and Dr. H. B. Holl on 



1. Bairdia MurcMsomana, sp. no v. PI. VII. figs. 9 a, 9 J. 



Carapace smooth, almost subcylindrical, arcuate, tapering, 

 and compressed at the ends. Anterior end rounded obliquely, 

 posterior obtusely pointed. Dorsal profile narrow and acutely 

 oval. Rare. 



This elegant Bairdia^ resembling to some extent other 

 elongate forms of Bairdia^ but wanting the broadly produced 

 and hatchet-shaped anterior end of the Carboniferous and 

 Permian B. curta and its varieties*, is dedicated to Sir E. I. 

 Murchison, Bart., whose Silurian researches have so greatly 

 aided in elucidating the structure and history of the old rocks 

 of Ireland, as well as of Great Britain and many other parts 

 of the world. 



2. Bairdia Griffithiana^ sp. nov. PL VII. figs. 10 «, 10 J. 



Carapace smooth, subdeltoid ; back obliquely arched, with 

 steep unequal slopes to the extremities, the anterior of which 

 makes an acute angle with the ventral border, whilst the pos- 

 terior is obtusely rounded. Ventral border slightly sinuate. 

 Ventral profile acute-ovate, compressed. Rare. 



The name of Sir Richard Griffith, Bart, the veteran Geolo- 

 gist of Ireland, is attached to this species. 



3. Bairdia Salteriana^ sp. nov. PI. VII. figs. 11a, 115. 



Carapace smooth, swollen, subovate ; with angular com- 

 pressed ends, and an acute-oval profile. Rare. To some ex- 

 tent this species resembles a subrhombical variety of B.jplebeia 

 (see " Permian Entomostraca," in the Transact. Tyneside Nat. 

 Field-Club, vol. iv. pi. 11. fig. 12a). 



Named in honour of J. W. Salter, Esq., F.G.S., whose re- 

 searches among Silurian Fossils are well known. 



Measurements. 



* Ann. Nat. Hist. ser. 3. vol. xviii. p. 42. 



