299 



The stones in wliicli tliis crustacean burrows vary in size, hut 

 not always in proportion to the size of the animal. In texture 

 these stones are generally coarsely granular, somewhat loose, 

 and of a calcareous character, often covered with minute algae. 

 As Mr. J. G-. McDougall, of Edithburgh, to whom I am in- 

 debted for the specimens, observed, it does not drag the stone- 

 about with it. Length of the largest specimen from front to 

 end of tail-fin, 45 mm. Length of its burrow, 65 mm. ; width 

 of the same, 15 mm. 



Dromia bicavernosa, sp. nov. Plate xiv., figs. 5 and 6. 

 This well-marked species may be described as follows : — 

 The cephalothorax is broader than long, its anterior border 

 being divided into three wide lobes, of which the middle lobe 

 is formed by the protogastric region. The outer lobes are 

 formed by the hepatic regions. On each side, between the- 

 middle and outer lobes, in front of the carapace, and somewhat 

 more deeply situated, are two reniform red marginal cavities, 

 the bottoms of which are covered with short adherent hairs. 

 The whole carapace, as well as other parts of the animal, are 

 covered with chocolate-brown coloured short hairs, which gives 

 a velvet-like appearance to the animal, from which the cavities 

 are strongly marked off by their bright red borders. Viewed 

 from above, these cavities are only partially visible. The 

 anterior part of the margin of each cavity shows in the middle- 

 a short inwardly- directed ridge, which is thickest at its ter- 

 mination, where it is somewhat deeper situated, and provided 

 with a tuft of hairs, surrounded by a row of minute impres- 

 sions semicircularly arranged. On the right-side cavity I 

 numbered 12 impressions, on the left side only 11. The func- 

 tion of these curious cavities is not known, as, unfortunately, 

 the specimen received was in such a bad state of preservation,, 

 and internally all the soft parts were so destroyed, that a more- 

 careful examination was quite impossible. The specimen 

 examined was a male, and is, as far as known, unique, and I 

 am indebted to Mr. H. Bates, of Hog Bay, Kangaroo Island,, 

 for kindly forwarding it. 



Eig. Desceiptiois- of Plate XIY. 



1. G-ryllopagurus litbodomus ; male. 



2. " " female. 



3. " " position when in its burrow. 



4. " " front view of burrow when. 



closed. 

 Figures 1 and 4 natural size. 



5. Dromia bicavernosa ; dorsal view. 



5«, " " inner view of fifth right ambulatoryjleg.. 



6. " " front view. 



Figures 5 and 6 half natural size. 



