Guide to Crustacea. 
66 
Table-case elevated on the back. One of the specimens exhibited, taken in 
No 12 . x 
the Bristol Channel, carries as a cloak a specimen of the sponge 
Clione celata. In the family Dynomenidae, represented by the 
little Dynomene hispida, only the last pair of legs are reduced and 
elevated on the back. 
Latreillia elegans belongs to the aberrant family Latreilliidae. 
In the triangular shape of the carapace and the length and slender- 
ness of the legs, the members of this family show a certain 
similarity to the Spider Crabs of the Tribe Oxyrhyncha. 
To this group also belongs the family Homolidae, a typical 
example of which is the large Homola ( Paromola ) cuvieri (Big. 45), 
Fig. 45. 
Homola cuvieri. The carapace of this specimen is about seven inches long. 
[Wall-case No. 5.] 
exhibited in Wall-case No. 5. This species has occurred, very 
rarely, on the west coasts of Ireland and Scotland. 
The members of the family Prosoponidae are only known as 
fossils, but it has recently been shown that they are closely allied 
to the living Dromiacea, especially to the deep-sea Homolodromiidae. 
They range from the lower Oolite to the Upper Cretaceous. A 
cast of the carapace of Prosopon mammillatum illustrates this 
family. 
Table-case The members of the tribe Oxystomata, sometimes known as 
No. 13. << Sand-Crabs,” may be recognised by the triangular shape of the 
mouth-frame, which is narrowed in front and extends forward 
between the eyes. The channels which carry the outward stream 
