Report on the Malacostraca, Pycnogonida and some Entomostraca. 523 



the posterior margin. (Uh segment between 2 and 3 times as long 

 as the 5th and ending posteriorly with a tooth on each side of the 

 root of the telson. Telson (fig. 39) a little shorter than the 6th ab- 

 dominal segment, at the end almost Vh times as broad as the root; 

 a small spine on each side almost opposite the beginning of the 

 distal 1 5th. On the posterior margin 7 pairs of setæ; as several 

 of these unfortunately lack the tip, their length cannot be given 

 with certainty, but the outermost are slightly shorter than the 

 middlemost. 



The eyes are of the usual pyriform shape and are almost half 

 as long as the carapace. The 1st pair of antennae (fig. 32) have a 

 three-jointed stalk and two still undivided branches. The first joint 

 of the stalk is twice as long as the 2nd and 3rd together; about 

 halfway along the outer margin there is a large tooth. The 2nd 

 and 3rd joint almost equally long; at the end of the 2nd joint a 

 tooth on the outer side. The endopodile half as long as the exo- 

 podite; the latter has the thick form usual in the larvae, with 5 

 bundles of setæ on the inner side, corresponding to the ends of the 

 joints which appear later. 



The squama (fig. 32) has the same length as the 1st pair of 

 antennae, has almost the same breadth everywhere and is very 

 nearly 4 times as long as broad; the end is rounded and bears a 

 strong tooth. In the flagellum the first joint is distinctly separated; 

 the remaining part of the flagellum only has indications of a series 

 of small, short joints. 



The labrum (fig. 33) has the usual, slightly bifurcate form. 



The mandibles (fig. 34) have no palp. The mastigatory part has 

 the ordinary bilobed form. The front portion, the cutting part, 

 has 3 teeth, and between it and the molar process project long, thin 

 teeth. 



The 1st pair of maxillae (fig. 35) have the 1st joint of the stalk 

 pointed triangular, the 2nd joint broadly rounded at the end. The 

 palp has 3 setæ at the tip, 2 on a tubercle on the inner margin. 



In the 2nd pair of maxillae (fig. 36) the 4 lobes of the basal 

 part are not alike; the innermost is almost rectangular at the end, 

 the 2nd pointed triangular, 3rd and 4th rounded; the anterior seta 

 on the 3rd and 4th lobe is situated on a special, small tubercle. 

 The palp flat, pointed triangular, with indications of division into 

 5 joints. The exopodite somewhat longer than the palp; the point 

 is rounded triangular with slightly concave inner side. The poster- 

 ior lobe small. 



The 1st pair of maxillipedes (fig. 37) consist of the usual 3 parts. 

 The basal part broad, flat, instinctly divided into 2 portions, with 



