MYSIDEA. 685 



half shorter, all horizontal. Caudal segment broad triangular, trun- 

 cate behind and pectinate with long setae. 



Plate 45, fig. 12 a, animal, enlarged; a', same, natural size; b, ex- 

 tremity of superior antennas ; c, caudal extremity. 



Sooloo Sea, southwest of Mindanao. Collected, February 1, 1842. 



The characters of this singular animal, as far as observed, will be 

 gathered from the figures. 



172 



