506 



MR. n. N. RIDLEY ON THE 



cell ; mucronate processes on the upper surface ; front wall 

 of ooDcium with a semicircular membranous area on the front 

 wall. 



The ooecium of C. Bidleyi is remarkable in its shape and relations 

 to the zooecium ; also there is a curious resemblance between the 

 membranous area and the orifice of the zooecium. 



Log. Fernando Noronha. 



CRUSTACEA. 



By E. I. PococK, 

 Assistant in the Zoological Department, British Museum. 



Introductory Bemarhs. — The fauna is in all essential respects 

 allied to that of the mainland and of the Antilles. The following 

 wide-spread forms were, as might have been expected, met with: — 

 Grapsus maculatus, Leiolophus planissimus, Hippa scutellata^ 

 Alpheus Edwardsii, and Gonodactylus chiragra. There are two 

 new species ol Alpheus, one of PanuUrus, and one of Stenopusculus 

 {S. spinosus). The last mentioned genus has hitherto only been 

 known from the island of Mauritius ; its occurrence here, there- 

 fore, is of great interest. A new freshwater Ostracod was also 

 obtained. 



Fig. 2. 



Cellepom Bidleyi, n. sp. 



