90 DESCRIPTIONS OF PREPARATIONS. 



der sensibeln Nerven, Rostock, 1880 ; Bodenstein, Z. W. Z. xxxviii. 1882 ; Solger, 

 Z. A. v. 1882; Leydig, op. cit. supra. Scales. Baudelot, A. Z. Expt. ii. 1873; 

 Carlet, A. Sc. N. (6) viii. 1879 ; O. Hertwig, M. J. ii. 1876; v. 1879; vii. 1881. 



Central nervous system. Mayser, Z. W. Z. xxxvi. 1882 ; Ussow, Archives de 

 Biologic, iii. 1882 ; Rabl-Ruckard, Arch, fur Anat. und Physiol., Anat. Abth. 1882, 

 1883 ; Id. Biol. Centralblatt, iv. 1884-85. Pineal gland. Cattie, Archives de 

 Biologic, iii. 1882 ; Id. Z. W. Z. xxxix. 1884. 



Organs of special sense. Nasal. Blaue, Z. A. v. 1882. Eye. Berger, M. J. 

 viii. 1882 ; Hoffmann, A. M. A. xxiii. 1884. Ear. Retzius, Gehororgan der Wir- 

 belthiere, i., Stockholm, 1881 ; for abstracts, see Biol. Centralbl. ii. 1882-83. 



Teeth. Tomes, Ph. Tr. 166, 1876;' Id. Dental Anatomy (ed. 2), London, 

 1882 ; Sternfeld, A. M. A. xx. 1882 ; in Scaroids, Boas, Z. W. Z. xxxii. 1879 ; cf. 

 Owen, Odontography, Text and Atlas, London, 1840-45. 



Digestive tract: minute anatomy. Edinger, A. M. A. xiii. 1877 ; physiology, 

 cf. Krukenberg, Vergleich. Physiol. Vortrage, ii. Heidelberg, 1882 ; in Cobitis fos- 

 silis, Lorent, A. M. A. xv. 1878. Pancreas, Legouis, A. Sc. N. (5) xvii, and xviii. 

 1873. Pharyngeal pouches, rumination, of Scaridae. Sagemehl, M. J. x. 1885. 



Air-bladder: minute anatomy. Schulze, Strieker's Histology (Sydenham Soc.), 

 ii. 1872, p. 78. Function. Moreau, A. Sc. N. (6), iv. 1876. 



Branchiae: minute anatomy. Riess, A. N. 47, 1881. Pseudo-branch^. 

 Maurer, M. J. ix. 1883. 



Heart. Kasem-Beck und Dogiel, Z. W. Z. xxxvii. 1872. Conus. Boas, M. J. 

 vi. 1880. 



Spleen (in Ichthyopsida). Phisalix, A. Z. Expt. (2) iii. 1885. 



Lymphatics. Sappey, Systeme lymphatique des Poissons, Paris, 1880. 



Thyroid and Thymus (with development). Maurer, M. J. xi. 1885. 



Kidneys. Hyrtl, Dk. Wien. Akad. i. 1850; ii. 1851. Balfour, Q. J. M. xxii. 

 1882 ; Emery, Archives Italiennes Biol. ii. 1882, cf. Fiirbringer, M. J. iv. 1878. 

 Head-kidney. Grosglik, Z. A. viii. 1885; ix. 1886; Emery, Ibid. Renal-portal 

 circulation. Jourdain, A. Sc. N. (4) xii. 1859. 



Sex organs. Brock, M. J. iv. 1878. Oviducts of Osmerus. Huxley, P. Z. S. 

 1883. Development of Duct. MacLeod, Archives de Biologie, ii. 1881 ; in Lepi- 

 dosteus, Balfour, and W. N. Parker, Ph. Tr. 173, 1882. 



Fishes ova. Mclntosh, Nature, xxxi. 1884-85. Relations of Yolk to Gastrula 

 in Teleostei. J. T. Cunningham, Q. J. M. xxvi. 1885-86. 



Parasites of fresh-water Fish. Zschokke, Archives de Biologie, v. 1884. 



17. SKELETON OF COMMON PERCH (Perca fl^^,v^at^l^s), 



With Figures 8 and 9. 



THE Perch belongs to the order Acanthopteri among Teleostei. It 

 may be taken as an illustration of a highly specialised as opposed to a 

 generalised type of organisation : combining as it does so many of the 

 peculiarities of its own class, rather than showing affinities, as e. g. do the 

 Dipnoi, to other and higher forms of life. Its skeleton is typically 

 Teleostean. 



