996 REVISION OF THE AUSTRALIAN L.EMODIPODA, 



but has a rounded eminence on its upper surface. The three 

 following segments each hears three spines, a mesial dorsal, and two 

 lateral, the latter placed immediately over the origin of the limbs ; 

 the spines of the first of these segments (second thoracic segment 

 propei - ) are the most prominent, and are very acute and inclined 

 forwards ; the spines of the other two segments are conical, and 

 are not inclined forwards. The fourth segment has also a short 

 conical spine at its posterior end ; the fifth has four short spines 

 or tubercles in the same position as those of the fourth ; the sixth 

 and seventh have short, pointed spines over the insertion of the 

 appendages. These posterior spines are not always present, the 

 constant ones being those of the second and third segments. None 

 of the rest of the segments possess spines. The superior antennas 

 are a little longer than the head and following three segments 

 ( 2 oths of an inch) ; the first segment is about half the length of the 

 head ; the second segment is twice the length ef the first, slightly 

 narrower proximally than distally, the third segment about two- 

 thirds of the length of the second, much narrower ; the flagellum 

 a little longer than the two last segments of the peduncle, and 

 consists of twenty-two or twenty-three segments. The lower 

 antennae are about equal in length to the peduncle of the superior 

 pair (/? ths of an inch) ; the fourth joint of its peduncle is the 

 longest ; the flagellum is slightly longer than the two last joints 

 of the peduncle, and has fourteen articuli. The anterior gnathopoda 

 are a little longer than the head ; the propodos is triangular in 

 lateral outline, with a well-defined palm, the defining lobe of 

 which is divided into two small teeth, each with two short, stout 

 setae. The posterior gnathopoda are as long as the head and two 

 following segments (Jth of an inch) ; the propodos is longer than 

 the head, long ovate, the palm convex, obscurely toothed distally, 

 and defined by two prominent acute teeth, an internal and an 

 external, between which is a hollow, in which the point of the 

 dactylos lies when folded up ; the dactylos is more than half the 

 length of the propodos, nearly uniformly curved. The first two 

 pairs of pereiopoda are as long as the posterior gnathopoda, slender ; 

 the third pair are a little more than half the length of the 



