Mr. R. Swinlioe on a new Species ofNettapus. 15 



Fig. 0, The same, with the calcareous matter removed by acid, shoNving 

 that the "points " of the superincumbent chitinous structure are 

 the knots of the network, and continuous with or set in a chi- 

 tinous expansion or chitinous membraniform laj'er : a, chitinous 

 network ; b, chitinous membrane. Horizontal view. 



Fig. 7. The same portion much more magnified, showing : — a, chitinous 

 structure and membrane, fi'om which the calcareous matter 

 has been removed by acid, = fig. 6; 6, where the former is still 

 covered by the calcareous layer, = fig. 5 ; c, where the calcareous 

 layer alone remains; del, points or knots (originally horn-cells) 

 in which the branches (e e) arise that [form the network ; //, 

 branches which are continuous with, and probably form by ex- 

 pansion, the chitinous membrane ; g, points which project 

 through the calcareous layer ; h (=iig. 5), peculiar worm-eaten 

 appearance of the calcareous layer, as if produced by a villous 

 surface of pseudopodia in connexion with the coenosarc (i). 

 Horizontal view. 



Fig. 8, The same. Thin vertical section of same fragment of crust, 

 much magnified, showing that the coenosarc of the lower inter- 

 stices of the chitinous structure is charged with white calcareous 

 matter ; the latter is here represented by the dark shade : «, free 

 surface formed of aborted or ill-developed spines, from being in 

 contact with the Pagurus ; J, surface next the shell ; c, older 

 chitinous structure without calcareous matter ; e, incised knots 

 of the chitinous network, showing that the latter is formed in 

 layers ; /, chitinous membrane or layer, &c., = fig. G & fig. 7, a ; 

 g, calcareous layer, =fig. 5 & fig. 7, h. Diagram. 



Fig. 0. The same. Similar portion, from which the calcareous matter 

 has been removed by acid : «, free surface ; 6, surface next the 

 shell ; c, older chitinous network, now much thickened ; d, in- 

 terstices of lower part emptied of their calcareous material by 

 the acid ; e, chitinous network of the same, much thinner in fibre 

 than that above it, from being younger and therefore presenting 

 wider interstices ; /, chitinous membrane or layer ; g, points of 

 chitinous structure projecting through calcareous layer, =fig. 5 

 & fig. 7, c, the latter now removed by the acid. Diagram. 



11. — On a new Species of Nettapus {Cotton-Teal) from the 

 River Yangtsze, China. By R. SwiNHOE, H.M. Consul at 

 Ningpo. 



In the Abb^ Armand David's "Catalogue d'Oiseaux de Chine," 

 published in the ' Bulletin ' of the ' Nouvelles Archives du Mu- 

 s(5um d'Histoire Naturelle de Paris,' t. viii. (1871), is entered, 

 under number 4A2,Netta2nis coromandelianuSjSco]).,iiS occurring 

 on the Yangtsze. In 1869 I spent some months of the early- 

 year on the Yangtsze and did not notice this bird ; I tlierefore 

 made inquiries of my friends at Kiukiang and Chinkiang as to 

 whether they had seen such a bird. Mr. Russell (son of the 

 ' Times ' correspondent) said that last spring he had noticed a 

 pair of such birds as I described perch on the yard-arm of a 

 gun-boat lying off the settlement, but that he was not allowed 

 to shoot them, Mr. Kopsch, Commissioner of Customs at 



