432 CRUSTACEA. 



the lines running laterally from the anterior part of the U are appa- 

 rently equivalents to the front margin of 5 L, 4 L (p. i»). lhe 

 surface between u and & is here also the same with 5L, 4L; and S 

 is the analogue of the normal tooth or lobe S. That this last is true, 

 is further probable from the teeth of the margin. The extra-orbital 

 tooth, judging from the distance to the next tooth, may correspond 

 normally to D and E, which teeth are often coalescent; then the three 

 following teeth will be in order N, T, S. The suture I" has the posi- 

 tion and relations of the depression between 2 R and 3 R (p. 29) much 

 more exactly than in the Pagurus, owing to the more nearly Brachy- 

 ural form of the carapax, and the area r is much like the areolet 2 R; 

 while the suture between r and S may be that between 1 R and 2 R. 



There is, therefore, a striking parallelism between the lines and 

 markings of the carapax of these two Anomoural forms, and be- 

 tween them and the Brachyural carapax. It is a fact of importance 

 also, that the lines which are mere depressions of the surface in the 

 latter become actual sutures in the former. It is also of special inte- 

 rest that both the Brachyural and Macroural lines or sutures are 

 here combined in the same species. The more minute relations to the 

 Macroura will properly come under consideration in our remarks on 

 that tribe of Crustacea. 



Subtmbe VII. PAGURIDEA. 



The Paguridea include two groups, distinguished by the inner an- 

 tennae, outer maxillipeds, and some other characters, the one aquatic 

 and the other subterrestrial in habit. 



1. Pagurjm:. — Inner antennae short, the first joint very short. 

 Outer maxillipeds having a multiarticulate flagellum to the palpus. 

 Habit aquatic or littoral. 



2. Cenobitidje. — Inner antennae very much elongated, the first 

 joint as long as the eyes or longer, and bent obliquely downward. 

 Outer maxillipeds having no flagellum to the palpus. Habit subter- 

 restrial. 



