326 
THE VOYAGE OF H.M.S. CHALLENGER. 
long. 136° 5' 0" E. (Station 190), a small female ; also Kobe, Japan, 50 fathoms, two 
males, and Hong Kong, 10 fathoms, a fully grown female and smaller male. This, 
which is the largest male, measures as follows : — 
Adult $ . 
Length of carapace, about 
Breadth of carapace, . 
In the smaller examples of this species the lateral lobes of the front are sometimes 
obsolete, as in the form described by de Haan as Leucosia rhomboidalis, which may be a 
variety of Leucosia craniolaris, though perhaps distinguishable by the form of the 
thoracic sinus. 
Lines. Millims. 
7 h 15-5 
6 13 
Family IY. Dorippid^e. 
Dorippiens, Milne Edwards (pt.), Hist. Nat. Crust., vol. ii. p. 151, 1837. 
Dorippidaz, Dana, U.S. Explor. Exped., vol. xiii., Crust. 1, p. 390, 1882. 
The afferent channels to the branchiae open (normally) behind the pterygostomian 
regions and in front of the chelipedes ; the carpal and following joints of the endognath 
of the exterior maxillipedes are not concealed by the merus-joint. The two to 
four posterior legs are short and feeble, and raised on the dorsal surface of the cara- 
pace, as in many Anomura. (The sexual appendages in the male are exserted from 
the sternum.) 
Genera : — Dorippe, Fabricius ; Ethusa, Roux (subgenus Ethusina, Smith) ; 
? Cymopolia, Roux ; Corycodus, A. Milne Edwards ; ? Cyclodorippe, A. 
Milne Edwards ; Cymonomus, A. Milne Edwards ; Cymopolus, A. Milne 
Edwards ; ? Tymolus, Stimpson. 
This family is not very extensively represented in the Challenger collection, and as I 
have examined no specimens of the genus Tymolus, or of the new genera recently 
characterised by A. Milne Edwards, I will not attempt to separate the genera under 
subfamilies or sectional headings. 
The genus Cymopolia, as I have noted below, is related in many points to the 
Catometopa. Cyclodorippe, A. Milne Edwards, should probably be regarded as the type 
of a distinct subfamily, since there are no openings communicating with the branchiae in 
front of the chelipedes (in this character this genus establishes the transition to the 
Leucosiidse). 
