76 /4 Guide to the Zoological Collections in the 



If we compare the disarticulated specimen of the 

 Hermit-crab, Cenohita rugosa, in Case 49 with the similar 

 specimens of the Prawn and the Crab between which it 

 is placed, we notice that the carapace, while much resem-* 

 bline that of both, differs from both in not includinor the 

 last thoracic segment, which forms a completely separate 

 and distinct ring. The cephalothorax again, while relatively 

 much larger than the abdomen, and relatively larger than 

 that of the Prawn, is not nearly so greatly developed as 

 that of the Crab ; and conversely the abdomen, though 

 relatively much smaller than the thorax, and not nearly 

 so important a part of the body, or so straightly ex- 

 tended as it is in the Prawn, is yet not a rudiment 

 tucked up out of sight, as it is in the Crab. 



The cavities for the antennules and eyes, so characteristic 

 of the Crab, are wanting, but yet these organs are con- 

 siderably more concealed beneath the carapace than they 

 are in the Prawn. Again the third pair of maxillipeds are 

 not expanded at the base as they are in the Crab, and yet 

 are not quite claw-like as they are in the Prawn. Further- 

 more, the last two pairs of thoracic legs are quite peculiar 

 in being rudimentary. 



The abdominal appendages, like those of the Crab (the 

 specimens in both cases being male), are incomplete and 

 rudimentary. 



Most of the Anomura are marine, and frequent shallow 

 water ; some, however, inhabit the great depths of the 

 ocean, and a few are found in brackish estuaries, or living 

 entirely on land. 



Of the three tribes into which the Anomura have been 

 subdivided, all are well represented in Indian waters and 

 in the Gallery. 



1st Tribe, Hippidea, Case 42, — This tribe includes two 

 small families — the Hippidx and the Alhuneidx. 



1st Family, Hippidse — represented by Hippa and 

 Remipes. These are small mole-like Crust- 

 aceans which burrow in the wet sand of the 



