Mr. R. Swinhoe on a new Species o/'Nettapus. 15 



Fiff. 6. The same, with the calcareous matter removed by acid, showing 

 that the " points " of the superiucumbent chitinous structure are 

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

 tinous expansion or chitinous membraniform layer : 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. 0; 6, where the former is still 

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

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

 in which the branches (ce) arise that jform 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 (=fig. 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 h§re represented by the dark shade : «, free 

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

 contact with the Pagnrus ; 6, surface next the shell ; c, older 

 chitinous structm-e without calcareous matter ; e, incised knots 

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

 layers ; / chitinous membrane or layer, &c., = fig. 6 & fig. 7, a ; 

 g, calcareous layer, = fio-. 5 & fig. 7, b. Diagram. 



Fig. 9. The same. Similar portion, from which the calcareous matter 

 has been removed by acid : a, free surface ; h, 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. 



II. — Oyi a new Species of Nettapus [Cotton-Teal) from the 

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

 Ningpo. 



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

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

 seum d'Histoire Naturelle de Paris,' t. viii. (1871), is entered, 

 under number 4A2^Nettapus coromandelia7iuSjScoY).,a.s occurring 

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

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

 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 



