PLATE XVIII. 
Diam. Page 
Fig. 1. Thel'phusa sinuatifrons, Milne Edwards (?); dorsal view of the 
anterior part of the carapace of a male example, showing 
the (probably abnormally) bilobated front, . x 1^ 214 
Fig. la. Dorsal view of the anterior part of the carapace of a female taken 
with the preceding specimen, . . . x 1^> 
Fig. 2. Geoccircinus lagostoma, Milne Edwards ; adult female from 
Ascension Island, * nat. size. 218 
Fig. 2 a. Frontal region of the same specimen, showing the form of the 
orbits, .... . nat. size. 
Fig. 26. Third maxillipede, exterior view, .... nat. size. 
Fig. 2c. Third maxillipede, interior view, .... nat. size. 
