ADDITIONS AND CORRECTIONS. 



Page 131. Labial tentacles, Thiele, Z. W. Z. xliv. 1886. Pericardial gland 

 (also in Gastropoda), Grobben, Z. A. ix. 1886; x. 1887. 



pp. 144-5. There are ten stigmata, the abdominal being eight, not seven as 

 stated. The testes and their ducts are paired. 



p. 146. Studies in Comparative Anatomy, iii ; the Structure and Life-history 

 of the Cockroach, &c., Miall and Denny, London and Leeds, 1886. Translucent 

 white spots on head, Carriere, Z. A. ix. 1886, p. 496. 



p. 177. Development of Astacus, Reichenbach, Abhandl. Senck. Ges., xiv. (i), 

 1886. 



p. 186. Green gland, Grobben, A. M. A., xxx. (2), 1887. 



p. 206, 1. 17. There are several species of Monocystis inhabiting the Earth- 

 worm. Bergh mentions (Z. W. Z. xliv. p. 308, note 2), in his paper on the genitalia 

 and their development in Lumbricus, that an ovarium or a pair of ovaries may be 

 present in somite xiv in addition to the ordinary pair in somite xiii. Two pairs of 

 ovaries are present in other Earthworms alsoj see Beddard, P. Z. S. 1887, pp. 388-9. 



p. 212. Giant fibres or neurochord, Leydig, Z. A. ix. 1886. 



p. 226, 8 lines from bottom : add that, the three lateral nerves spring from the 

 principal ganglion on each side. 



p. 250, 12 lines from bottom: the cells collect round not in the canals and 

 ampullae. The error is due to a mistake in an abstract, the only account accessible 

 at the time. 



p. 258, ad fin. The Amoebulae of Pelomyxa probably belong to a parasite; 

 cf. p. 900, note i. 



p. 302. Tongue of Bee, Breithaupt, A. N. 52, ( ), 1886 ; Graber, Z. A. x. 1887. 



p. 343 and note. Pineal eye of Lizards, Spencer, Q. J. M. xxvii. 1887; of 

 Fishes (Cyclostomt)> Beard, Nature, xxxvi. 1887, p. 246. 



p. 347. Ear-ossicles of Mammalia. For other views, see a paper by Dollo, in 

 Q. J. M. xxiii. p. 579, and Baur, Q. J. M. xxviii. p. 169. It seems to me that 

 embryological evidence is conclusive in favour of the view in the text ; see the 

 plates to W. K. Parker's paper on the Skull of Mammalia, Ph. Tr. 176, 1885. 



p. 349, 10 lines from top. There are five visceral clefts in some Lacertilia 

 and Ophidia, as in Chelonia (Rathke'), according to van Bemmelen, Z. A. ix. 



p. 352, 10 lines from top. The pulmonary artery of Lacerta, Tropidonotus, and 

 the Hen is the Vlth aortic arch as in Amphibia, the Vth aborting. Id. ibid. 



PP- 37> 37i. Selenka, Didelphys Virginiana, Studien iiber Entwickelungs- 

 geschichte der Thiere, i., Wiesbaden, 1886; Caldwell, Embryology of Monotremata 

 and Marsupialia, P. R. S. xlii. 1887. 



p. 446. On the Salpa chain, see Brooks, Studies Biol. Lab. Johns Hopkins 

 Univ., iii. pt. 8, 1887. 



