1 l Piacea. 
Systematic, Euselaohii. 
5431 
Colour discrimination ; White, 167. 
Brooding ; Ekman, 29 ; Gilchrist, 42. 
Oral gestation ; Gudger, 46. 
Tides and distribution ; Huntsman, 
71. 
Migration ; Meek, 94. 
Food ; Buytendyk, 14 ; Hoffman, 
55 ; .Toubin et Eoule, 74 ; Lebour, 80 ; 
Pearse, 108 ; Petersen, 109 ; Roule et 
Joubin, 131 ; Suomalainen, 157 ; Wil- 
son, 171. 
VARIATION AND EVOLUTION. 
Variation; Regan, 118; Schmidt, 
140, 141 : Heredity ; Newman, 99 ; 
Schmidt, 141 : Teratology ; Delphy, 20 ; 
Ehrstrom, 26 : Hybrids ; Newman, 99. 
DISTRIBUTION. 
(a) Marine, 
Arctic Zone. 
Greenland ; Nichols, 102. 
Sub arctic and North Temperate 
zones. 
Europe and Mediterranean ; Despott, 
21 ; Ege, 24, 25 ; Facciola, 31 ; Fage, 
32, 33; Johansen and Lofting, 72; 
Nordgaard, 103 ; Roule, 128 ; Schmidt, 
142 ; Schmidt and Strubberg, 143 ; 
Senna, 147 ; Taning, 159 ; Thompson, 
160 : Western Atlantic ; Fowler, 37 ; 
Huntsman, 71 : North Pacific ; Hubbs, 
65, 66 ; Tanaka, 158. 
Tropical Zone. 
VV. Atlantic ; Fowler, 34 ; Garman, 
40 ; Ribeiro, 126 : Natal ; Regan, 119 : 
Sunda Is. ; Popta, 113 : Philippines ; 
Fowler, 36 : Queensland ; McCulloch, 
89 ; McCulloch and McNeill, 90 ; 
McCulloch and Waite, 92 ; Ogilby, 
105, 106. 
Sout hTemperate Zone. 
S. Australia ; McCulloch and Waite, 
91 : New Zoaland ; Thomson, 162. 
(b) Freshwater. 
Palaearctic. 
Malta ; Despott, 21 ; China ; Nichols, 
100 . 
Nearctic. 
Evermann, 30 ; Fowler, 37 ; Nichols, 
75 ; Snyder, 149, 150. 
Indian. 
Annandale, 3. 
Ethiopian. 
Africa; Boulenger, 8, 11; Hubbs, 
64. 
Neotropical. 
S. America ; Eigenmann, 27, 28 ; 
Fowler, 34, 35 ; Ribeiro, 120-127. 
Australian. 
McCulloch and Waite, 91. 
(c) Fossil. 
Devonian ; Stensio, 154 : Carboni- 
ferous ; Moodie, 96; Prevost, 114; 
Woodward, 175 : Jurassic ; Wood- 
ward, 173, 174 : Cretaceous ; Berry, 7 ; 
Canavari, 15 ; Chapman, 18 ; Larabe, 
79 ; Stromer, 155 ; Woodward, 173 : 
Tertiary ; Chapman, 18 ; Llueca, 84 
Stef ano, 153 ; Eocene; Pieragnoli, 112. 
III.— SYSTEMATIC. 
M ARSIP0BRAN CHII. 
Petromyzonidae. 
Ammocoetes, histology of spinal cord, 
Leder 81. 
Myxinidae. 
Heptatretus hexatrema eggs and em- 
bryos, Gilchrist 43. 
SELACHII. 
EUSELACHII. 
Fossil teeth, Stefano 152 ; Tertiary 
Selachians of Spain, Llueca 84 ; of 
Tuscany, Pieragnoli 112. 
PLEUROTREMATA. 
Lamnidae. 
Of Cretaceous and Tertiary of New 
Zealand, Chapman 18; of Upper 
Cretaceous, Maryland, Berry 7. 
Orectolobtdae. 
Crossorhinus jurassicus sp. n. Jurassic 
Bavaria, Woodward Proc. Zool. Soc. 
1918 p. 231 pi. i fig. 1. 
