IDOTEA APPENDICULATA. 397 



upper antennae have the basal joint short, but very much 

 dilated ; the basal joint of the outer antennae is not 

 visible from above ; the four following joints are mode- 

 rately robust and nearly equal in length ; the flagellum 

 is long, slender, and multiarticulate. The eyes are placed 

 in the middle of each side of the head, the anterior- 

 lateral angles of which are strongly produced and 

 rounded. The legs are slender and attached close to and 

 beneath the lateral angles of each of the segments of 

 the body. 



The tail is considerably elongated, being about one- 

 third of the length of the entire animal ; it is lanceolate 

 in form, being more or less suddenly dilated at a short 

 distance beyond the middle. It appears to consist of 

 only a single segment, but faint traces of articulations 

 can be seen at each side near the base. 



Besides Dr. Leach's Sidmouth specimen, which is 

 labelled I. lancifer, the British Museum possesses speci- 

 mens from Ilfracombe, collected by Mr. Gosse, and we 

 have received it from Polperro from Mr. Loughrin. 



The species is also given in the List of Isopoda in the 

 Reports of the British Association for 1860, p. 225. 



