13 Pisces. 
V. PISCES. 
II.— THE GENERAL SUBJECT. 
j T. Gill, Mem. Ac. Washington, vi, 1893, pp. 127-138, gives a con- 
| spectus of his classification of Fishes ; 324 families are named, but not 
defined. 
D. S. Jordan again discusses the relation of temperature to the number 
of vertebrae in Fishes ; Wilder Quart. -Cent. Book, pp. 13-36. 
On ribs and similar elements, and their nomenclature ; Baur, Auat. 
Anz. ix, 1893, pp. 116-120. 
On the haemapophyses ; Boulenger, Ann. Nat. Hist. (6) xii, 1893, 
pp. 60 & 61. 
. H. Klaatscii studies the development of cartilaginous vertebrae in 
Fishes. Morphol. Jalnb. xx, 1893, pp. 1*13-186, pi. vii. 
On the notochord and its relation to the vertebral columu in the 
caudal extremity ; Y. Schmidt, SB. Ges. Dorpat, x, 1893, pp. 142-152. 
On the evolution of the scales of Fishes ; A. S. Woodward, Natural 
Science, iii, 1893, pp. 448-450, fig. 
On the pancreas of Fishes ; Laguesse, C.R. Soc. Biol. (9) v, 1893, 
pp. 402-404, and J. Anat. Physiol, xxx, 1894, pp. 79.-116, pi. iii. 
Susanna P. Gage, Wilder Quart.-Cent. Book, pp. 259-313, 7 pis., 
compares the brain of the American Newt ( Molge viridescens, Raf.) with 
those of Amia and Petromyzon . 
G. Fritscii, Rep. Brit. Ass. 1892, pp. 757 & 758 (1893), has a com- 
munication on the origin of the electric nerves. 
On the electric organs of Fishes ; F. Gotch, P. Liverp. biol. Soc. vi, 
1892, pp. 148-154. 
On the possible relation of the sense-organs of the skin of lower 
Vertebrates to the hairs ; Leydig, Biol. Centralbl. xiii, 1893, pp. 359- 
375 ; Maurer, Morphol. Jahrb. xx, 1893, pp. 429-448. 
On the derivation of the pineal eye in Fishes; W. A. Logy, Anat. Anz. 
ix, 1893, pp. 169-184, figg. 
Researches on the development of Fishes; MlTROPHANOW, Trav. Soc. 
Yarsovie, ii, 1892, pp. 160-216, pis. i-vii. 
H. B. Pollard, Anat. Auz. ix, 1894, pp. 349-359, figg., has a paper on 
the “ Cirrhostomial ” origin of the head in Vertebrates. 
On the formation of the germinal layers in Vertebrates ; Translation 
of Lwoff’s paper in Ann. Nat. Hist. (6) xi, 1893, pp. 360-377. 
On the nuclei in the yolk of Fish ova ; H. E. Ziegler, Ber. Ges. 
Freiburg, viii, 1894, pp. 192-209. 
On the relation of size to sexual maturity ; Holt, Rep. Brit. Ass. 
1892, p. 765 (1893) ; Cunningham, t. c. p. 767 ; Sauvage, Ann. Stat. 
aquic. Boulogne-s.-M. i, 1893, pp. 86-98. 
J. Noe remarks on the length of time various Fishes can survivo out 
of their natural element, and formulates the law that the more a species 
has sedentary habits the longer it can live out of water, and vice versa ; 
C.R. Soc. Biol. (9) v, 1893, pp. 1049-1051. 
