2 Crust. 
X. CRUSTACEA. 
Systematic — continued. 
Page 
7. Amphipoda . . 
. 41 
Gammarina . 
. 41 
Hyperina . . 
. 42 
, Caprellina . . 
. 43 
Ingolfiellina . 
. 44 
8. Phyllocarida . . 
. 45 
b. Entomostraca 
1. Branchiopoda . . 
. 45 
a. Phyllopoda . 
. 45 
b. Cladocera . 
. 46 
2. Copepoda . . . 
. 48 
3. Branchiura . . 
. 54 
4. Ostracoda . . . 
. 54 
5. Cirripedia . . . 
. 56 
Gigantostraca 
Page 
I. Titles .... 
. . 58 
II. Biology . . . 
. . 60 
III. Distribution . 
. . 61 
IV. Systematic . . 
. . 61 
Xiphosura. . 
. . 61 
Trilobita . . 
. . 62 
Eurypterida . 
. . 65 
Pycnogonida . . . 
. . 66 
INTRODUCTION. 
The Record of Crustacean Literature for 1903 is considerably less in bulk 
than was that for 1902, owing, in part, to the smaller number of papers 
dealt with (280 as against 316), and, in part, to the fact that an unusual 
number of large systematic works were recorded last year. 
Among the most important contributions to Carcinology published 
during 1903 is Mayer’s (145) Report on the Caprellidce of the “Siboga” 
Expedition, which includes a revision of the entire family, based on very 
extensive collections from all parts of the world, ft forms a supplement 
to the author’s well-known monographs of 1882 and 1890 and, though 
chiefly of systematic interest, it includes many additional observations on 
morphology and bionomics. One of the most interesting discoveries of 
recent years is recorded in Hansen’s paper (101) on the biaolfiellidce , a 
new family of Amphipoda , for which he proposes to establish a new 
suborder, Ingolfiellina. The history of this discovery as related in 
Hansen’s paper carries with it a moral which may be heartily recom- 
mended for consideration by the over-hasty writers of preliminary notices. 
The same author discusses (100) some points in the morphology of the 
aberrant Isopods Bathynomus and Anuropus, and in connection with a 
much-needed revision of the “Challenger” Serc/estidce (102), describes 
luminous organs, hitherto unknown in Decapods, in a species of Sergestes. 
Berndt (13) has reinvestigated the anatomy of the aberrant Cirripede 
Aldppe and (14) describes a second species of the very rare Cryptophialus. 
Thienemann’s (230) discovery of statocysts in the Isopod Anthura 
raises some interesting questions, both morphological and physiological. 
Borner (19) attempts to compare the segmentation of the limbs in the 
various classes of Arthropoda, but his treatment of the Crustacea will 
hardly commend itself to students of that group. Carpenter (41) in 
a suggestive and interesting paper deals with the relations between 
Crustacea and other Arthropods, and Packard (172) gives his views on the 
same subject. 
Among many papers on Physiology, Bruntz (35) has an important one 
on the excretory organs of Arthropoda, which has also a morphological 
interest. 
Thompson’s two papers (234 & 235) on the larval development of 
JEupagurus and of Naushonia , and Williamson (256) on the larval stages 
of Carcinus are the chief embryological works of the year. 
