President's Address. 11 



as Salter's, M'Coy's work has left its mark on Scotch Silurian 

 Pala3ontology. The material employed by him was chiefly 

 collected by Professor Sedgwick during a tour in the Border 

 counties of Scotland in 1841, and again in 1848. Tlie 

 scientific results of this trip were communicated to the 

 British Association in 1850, and entitled, "On the Geological 

 Structure and Kelation of the Frontier Chain of Scotland."* 

 The list of organic remains prepared by Professor M'Coy was 

 ajDpended, and does not differ materially, allowing for dis- 

 crepancies of synonomy, from that of Mr Salter's lists relating 

 to Wrae quarry, the Kirkcudbright deposits, etc. 



The descriptions of these fossils appeared in a series of 

 papers contributed to the pages of the Annals and Magazine 

 of Natural History, between the years 1850-52. Our present 

 subject requires from us only a notice of three of these. In 

 the first paper, "On some New Silurian Mollusca,"f were 

 described Orthoccras ijolitum (M'Coy) from Glenwhapple, 

 Bellerophon suhdccussatus (M'Coy) from Mulloch, and 

 TrocJms Moorci (M'Coy) from Dalquharran. The second 

 paper, published in the same year,| contained Hemithyris 

 angustifrons (M'Coy), from IMulloch Hill; H. nasuta 

 (M'Coy), found at Craighead Quarry; Orthisina Scofica 

 (M'Coy), Craighead; and Holojoella cincta (M'Coy), again 

 from Mulloch. 



The third paper, " On New Lower Palaeozoic jMollusca," 

 published in 1852, § completed M'Coy's investigations in this 

 direction, when we were introduced to Murchisonia cancellata 

 (M'Coy), from Mulloch; 3f. simjjlex (M'Coy), from Dal- 

 quharran ; Maclurca macromphala (INI'Coy), Craighead ; and 

 Eccyliomijhalus Scoticus (M'Coy), from Mulloch. 



The last-mentioned fossil is placed like Belter oplion and 

 Machivea in the order Heteropoda. The shell is thin, and 

 curved or discoidal, the whorls few and widely separated 

 from one another, and the coils in one plane. It probably 

 bears some relation to the genus Cyrtolitcs (Conrad), a 

 Silurian fossil, and to Pliancrotinus (Sby.), a similar loosely- 



* Brit. Assoc. Eeport for 1850 (pub. 1851), pp. 10;J-107. 



t Annals, 1851, vii., pp. 45-C3. 



X Ibid,, pp. 387-409. § Ibid., 1852, x., pp. 189-105. 



