GEOGRAPHICAL DISTRIBOTION. 
Oruat. 16 
Niphargus puteanus var. and a new species of Titanethes found in the 
cavern of Monte Fenere, Val Sesia, Italy ; Parona, Atti Soc. Ital. xxiii. 
pp. 42-60. 
Cambarus typhlohius in caverns of Carniola; Joseph, JB. schles. Ges. 
1880, p. 202. 
Many new genera of Decapods from the depths of the West Indies, 
chiefly CarcinoplacidcB^ Paguridce, and Galateidce^ dredged by A. Agassiz, 
described by A. Milne*Edwards, Bull. Mus. C. Z. viii. No. 1, 68 pp., 
pi. i. Two of the new genera are blind, Bathyplax, family Carcino- 
placidcc, 423-451 fath., and Cymonomtis, family Dorippidce, 175-450 fath. 
A new blind Nephropsis ; id. Ann. Sci. Nat. (6) ix. Art. 2. 
Palaeontological Relations. 
Fossil crayfish from tertiary beds in Wyoming, which do not differ 
generically from Cambarus, though with some external resemblance to 
Astacus, indicated by A. S. Packard, Am. Nat. xiv. p. 222. A new 
Estheria from the quaternary clays of Canada ; id. 1. c. p. 496. 
Use by Man. 
Several lists of edible Crustacea in the Catalogues of the International 
Fishery Exhibition at Berlin, 1880 ; vide supra. Geographical Distribu- 
tion. 
DECAPODA. 
J. E. V. Boas has published a very interesting and elaborate treatise 
on the natural (and phylogenetic) affinities of the Decapods. He describes 
comparatively the principal families and genera, beginning with the lower 
forms, treating the Macrura and Anomura more in detail because they 
contain the primitive types and important degrees of improvement, and 
going over the Brachyura more generally as a whole. His chief attention 
is of course given to the oral parts and legs, and he figures on the plates 
side by side the corresponding parts of the whole series of families, 
beginning with Thysanopoda or with the larva of Peneidce, and ending 
with typical Brachyura. The composition of the cephalothorax, its per- 
sisting or transitory sutures and ridges, the chitinous plates of the pleon, 
and the number and structure of the gills, are also the objects of his 
descriptions and comparisons ; and he gives on a synoptic table (p. 162) 
the number of the gills and their chief components for 36 genera, chosen 
from the principal families. From these considerations, the author comes 
to the following systematic (or rather phylogenetic) arrangement of the 
Decapods : — 
Suborder I. Natantia. 
Fam. 1. Penoiidce. 
Fam. 2. Eucyphota (all the rest of the Carides). 
