ANOMOURA INFERIOR A. 431 



sponding to the anterior and outer side of 2 M. The area between the 

 sutures p p, is analogous to the cardiac and intestinal area. Outside 

 of u u, between u andc£', there is a faint depressed line running for- 

 ward and outward, and finally bending more outward, so as to reach 

 d' at the margin adjoining the piece S anteriorly. The space be- 

 tween u and this depressed line may correspond to 6L, 5L, (p. 29), 

 but it is more probable that the whole space from v to d' has this rela- 

 tion. In either case, the piece S may correspond to the normal tooth 

 or lobe S, and the suture d' n, may be the equivalent of the line between 

 1 R and 2R (p. 29), while I" may correspond to that between 2 R 

 and 3 R. 



We thus trace out many of the regions of the Brachyural carapax 

 in the carapax of this Pagurus, while, at the same time, we show the 

 strong influence of a Macroural character. 



JEglea affords similar facts (see fig. 6, Plate 30), and it is not a 

 little remarkable that the sutures should be throughout almost identi- 

 cal with those of the Pagurus described. The transverse dorsal (d, 

 fig. 6 b) is strongly marked. Either side, it bends forward, taking the 

 course of d' towards the margin, and thence there is a continuation 

 forward (wi, fig. 6 c) to the base of the outer antennse, precisely as in 

 Pagurus. Moreover, there is also another suture (n), passing late- 

 rally and downward from d', and thus separating a piece S, as in 

 Pagurus. The anterior region of the carapax has the same U depres- 

 sion, and depressed lines terminate either side in the margin at the 

 anterior side of S. 



The correspondence is thus far exact; and it is hardly less so in 

 the posterior region of the carapax. The two dorsal longitudinal 

 sutures p, p, are as in Pagurus, only a little more distant. There is 

 a lateral longitudinal suture which follows near the lateral margin, 

 running backward from the piece S, as if a continuation of m ; it lies 

 above the margin of the carapax for much of its course backward, 

 and then passes below this margin to the posterior margin, like the 

 lateral suture in the Brachyura. Where it is below the margin, it 

 forms an angle and receives another suture (o) running obliquely 

 from the edge. The suture I is continued to the angle between d and 

 d' , as well as to s, in exact parallelism with what has been described 

 of the Pagurus, although the piece r, thus included, is of very different 

 shape in the two. 



The U suture is again the posterior limit of the median region, and 



