STALK-EYED CRUSTACEA 



433 



from the middle line, near the external angles of the cara- 

 pace. They are circular and are directed upwards. The 

 sternum is of moderate size. The abdomen is very thick, 

 and is longer than the anterior portion of the body. The 

 external antenna are some distance apart. The gills are 

 nineteen in number. There is no external appendage to 

 the external maxillipedes. 



Range. — West Indian Sea, South Coast of England, 

 Mediterranean Sea, Canary and Cape Verde Islands, 

 Philippine Sea, West Coast of North America, Fiji, Japan. 



I. Arctus americanus. 



Arctus americanus . A. Milne Edwards, Smith. 



Range. — Guadaloupe, in deep water ; West Coast of 

 North America. 



Family II. Palinuridae. 



Palimtridce . . . Dana, Spence Bate, Miers. 

 Langoustiens . . . H. Milne Edwards. 



Carapace longitudinally subcylindrical. Orbits only 

 partially excavated in the carapace. External antennae 

 terminating in a long rigid multiarticulate flagellum. 



Synopsis of the Genera. 

 A. There is a small central tooth or tubercle over- 



Palimints. 



Paiiiilinis. 



hanging the ophthalmic segment of the carapace, situated 

 in the middle line between the frontal horns. — {Palinuj'us.) 



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