478 MR. A. SMITH WOODWARD ON THE [May 17, 



e. 2 ad. sk. Coonoor, Nilghiris, Jan. 28, Hume Collection. 

 1881 (TF. Davison). 

 Wing 13-9 inches. Very pale below, with whitish cross-bars, 

 somewhat coalescing on the chest, which is consequently more 

 uniform. Face deep ochre, barred across with blackish. 



/. Ad. sk. Southern India (Dr. Jerdon). J. Gould, Esq. 



Wing 13"6 inches. Very tawny in appearance, the face being 

 deep ochreous buff, rufous near the eye, with scarcely any sign of 

 white on the frill of the ear- coverts. 



g. Ad. sk. Nuwara Eliya, Ceylon. Mr. E. Boate [0.]. 



Wing 13-2 inches. A dark bird, with the chest barred like the 

 rest of the under surface ; face deep ochreous buff, with evident 

 traces of dusky cross bars. 



h. Ad. sk. Nuwara Eliya, Ceylon. Mr. E. Boate [C.]. 



Wing 12-5 inches. A darker bird, with the chest coarsely barred 

 with dark brown, somewhat uniform on the sides. Face uniform 

 deep rufous ochre, with a slight indication of white on the lower 

 part near the frill. 



i. Ad. sk. Kandy {A. White). Hume Collection. 



Wing 11 "9 inches. Strongly tinged with ochreous below. Face 

 bright orange-rufous, with scarcely any white on the lower margin. 

 No sign of cross-barring on the face. 



2. On the Presence of a Canal- System^ evidently Sensoiy, 

 in the Shields of Pteraspidian Fishes. By A. Smith 

 Woodward, F.Z.S., F.G.S., of the British Museum 

 (Natural History). 



[E#cftived April 28, 1887.] 



In his well-known monograph on the Cephalaspidae, Professor 

 Rav Lankester described and figured ' a number of small depressions 

 or " pits," arranged in double series upon the external surface of 

 certain head-shields pertaining to the Heterostracous or Pteraspidian 

 division of the group ; and three years subsequently, in making 

 known a new generic type, Holanpis", he remarked still further 

 upon the same curious pittings, which were shown in this fossil with 

 unusual distinctness. These he naturally regarded as " the sites of 

 soft tegumentary structures, in all probability of those characteristic 

 sensory -follicles of fishes," with which they agreed in disposition ; 

 and then followed another inference, " that a secreting membrane 

 was closely attached to the striated calcareous material" of the 

 outer layer of the shield in the original living fish. 



Some" of these fossils are now in the British Museum, the fine 



1 E. Eay Lankester, " The Cephalaspida" (Mon. Palceont. Soc, 1808, 187U), 

 pp. 17, 22, pi. i. figs. 1, 4, 8 ; pi. vi. figs. 1, 6 ; pi. vii. figs. 8, 9. 



^ E. Eay Lankester, " On Holuqiis st'riccus," Geol. Mag. vol. x. (1873), 

 pp. 241-245, pi. X. 



