M Y S I D E A. gge 



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

 cate behind and pectinate with long setse. 



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

 tremity of superior antennae ; 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 



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