2 Crust. 
X. CRUSTACEA. 
[1904] 
Page 
5. Tanaidacea ... 39 
6. Isopoda 39 
Asellota ... 39 
Phreatoicoidea . 40 
Flabellifera . . 40 
Valvifera ... 41 
Epicaridea ... 41 
Oniscoidea ... 42 
7. Amphipoda ... 43 
Gammarina . . 43 
Hyperina ... 46 
Caprellina ... 46 
8. Phyllocarida ... 47 
B. Entomostraca 
1. Branchiopoda . . , 47 
a. Phyllopoda. . 47 
b. Cladocera . . 47 
Page 
2. Copepoda .... 49 
3. Branchiura ... 52 
4. Ostracoda .... 53 
5. Cirripedia .... 55 
Gigantostraca 
I. Titles 56 
II. Subject-Index ... 57 
III. Distribution. ... 57 
IV. Systematic 
Xiphosura. ... 58 
Trilobita .... 58 
Eurypterida ... 59 
Pycnogonida. Titles etc. . 60 
INTRODUCTION. 
The number of titles recorded under Crustacea is less than last year 
(258 as against 280) but this is accounted for by the fact that the list has 
been closed at a much earlier date, before some of the foreign periodicals 
had reached the London libraries. 
One of the most notable works published during 1904 is Doflein's (53) 
Report on the Brachyura of the " Valdivia " Expedition. Besides de- 
scriptions of some important new genera and species this memoir contains 
the results of an elaborate investigation into the structure of the eyes in 
deep-sea crabs. Gruvel's (71) Monograph of the Cirripedes is a very 
useful compendium of the group of which the author has done much to 
extend our knowledge during recent years. It is nothing short of an 
absurdity however that a book which was certainly published not later 
than November, 1904, should bear on its title page the date 1905. 
Thiele's memoirs on Phyllocarida (219) and Branchiura (218) contain 
many new observations on the morphology as well as on the classification 
of these interesting groups. Zograf's (252) investigation of the median 
eye and certain associated structures in the Branchiopoda is of great 
morphological interest. Smith (198) has elucidated some points hitherto 
obscure in the remarkable metamorphosis of the Isopod Gnathia. 
Bonnier's (17) important account of a remarkable parasitic Copepod 
was published in 1898 but appears to have escaped notice in other biblio- 
graphies as well as in our own. Miss Moseley (138) has discovered 
an additional gill hitherto overlooked by the innumerable students of the 
common Crayfish. 
The chief physiological paper of the year is Keeble & Gamble's (101) 
work on the colouration of Decapods, a subject to which they have previously 
made important contributions. Experiments on the "psychology" of 
Crustacea are recorded and discussed by Bohn (15), Spaulding (200 & 201) 
and Yerkes & Huggins (248). Regeneration is treated of by Reed (170), 
Morgan (137) and Ariola (11). 
Plankton research as usual forms the subject of a large number of 
papers among which those of Ekman (56) and Wesenberg-Lund (234) 
may be specially mentioned. 
