REVIVAL OF AN EARLIER VIEW 147 
ferred. The Anomoura are not distinguished from the 
Brachyura and Macroura by any common character; from 
the former they differ by the disposition of the vulve, 
from the latter by not having a fan-shaped termination to 
the pleon. But all the organs vary extremely in the 
Anomoura, and no bond of connexion between the Apte- 
rura and Pterygura is found either in the shape of the 
antenne, mouth, maxillipeds, trunk, plastron, branchie, 
or in that of the pleon. The Anomoura contain forms 
which differ more from one another, than the Brachyura 
do from the Macroura. By the Anomoura the closest re- 
lationships are torn asunder, as the Dromiacea from the 
Maiacea, the Raninoidea from the Leucosiz, the Porcel- 
lanidea from the Galathez, the Megalopidea from the 
Astacoidea.’ 
This criticism, published in 1841, appears now to be 
winning deserved acceptance. ‘The recent researches of 
M. F. Mocquard into the armature of the stomach also 
show the Anomura to be an artificial division. With the 
transfer of the Pterygura to the Macruran sub-order, in 
which all the families are pterygurous, the name becomes 
inappropriate and may give place to the older name 
Anomala, used by Latreille, though in a narrower applica- 
tion. Any slight inconvenience that may result from the 
similarity of name between the Brachyura anomala and 
Macrura anomala will be compensated by the reminder 
thus supplied that these two tribes correspond with the 
collective Anomura of Milne-Edwards. 
The Macrura contain the following tribes :—Anomala, 
Thalassinidea, Scyllaridea, Astacidea, Stenopidea, Penzei- 
dea, Caridea, among which will be found along with others 
those popularly well known as Hermit Crabs, Lobsters, 
Crayfishes, Prawns, and Shrimps. 
The following Table shows the subdivision of the tribes 
into legions and families :— 
