346 STALK-EYEU CRUSTACEA 



pair of biramous lamellar appendages, the last of large 

 size, its length exceeding the breadth. Thoracic sterna 

 linear, not forming a shield. 



External maxillipedes moderately broad, suboper- 

 culiform. Eyes not provided with distinct orbits ; the 

 cornea of small size. Internal antennae strongly de- 

 veloped, without special fossae ; one of the flagella greatly 

 elongated, the other of moderate size or absent. Antennae 

 with a massive peduncle composed of four or five joints, 

 with or without a movable projecting -spine (acicle) ; the 

 flagellum short. Males destitute of copulatory organs, 

 and with only a simple pair of abdominal appendages on 

 the penultimate segment. 



Range. — West Indian Sea, Azores, Brazil, Cape 

 Verde Islands, Seas of Asia, Philippines, Celebes, New 

 Holland ; in shallow water. They may bury themselves 

 in the sand. 



Family I. Hippidae. 

 Family II. Albuneidse. 



Synopsis of the Families. 



A. First pair of legs nonchelate, subcylindrical. 



a. Terminal segment of abdomen elongated, lanceo- 

 late.— (T/z///^/^*?.) 



B. First pair of legs chelate, flattened. 



d. Terminal segment of abdomen ovate. — {^Albuncidcs^ 



Family I. Hippidae. 



Hippidcc . Dana, Stimpson, Miers, Henderson. 



First pair of legs nonchelate, subcylindrical. Terminal 

 segment of abdomen elongated, lanceolate. External 

 maxillipedes suboperculiform, the fourth joint broad ; 



