104 MK. B. H. burjSte ON [Feb. 19, 



Distance between the estraorb. angles 13| 



Width of the free border of the Iront 6 



Length of the front in the middle If 



Thickness of the carapace 6 



Breadth of the orbits 3| 



Height of the orbits 2| 



Length of the chelae 8| 



Length of the fingers 4| 



Height of the chelae at the articulation of the 



dactylus Si- 

 Length of the meropodites of the penultimate 



pair 8g 



Breadth of these meropodites . 3-| 



EXPLANATION OF PLATE X. 



Fig. 1. Potamon {Potcmtonautes) floweri, n. sp. X l^. 



2. Front view of the cephalothorax. X If. 



3. The left orbit and the surrounding part of the upper surface, showing 



a portion of the postfrontal crest and the tooth between the extra- 

 orbital and epibranchial angles, viewed from above. X If. 



4. Outer foot-jaw. X If. 



6. Anterior part of the sternum and terminal johit of the abdomen, 

 showing the thickened ridges near the insertion of the chelipedes. 

 X If. 



6. Abdomen. X If. 



7. Larger chelse. X l^. 



4. A Contribution to the Myology and Visceral Anatomy of 

 Chlamydophoriis truncatus. By R. H. Burne, B,A., 

 F. Z.S.J Anatomical Assistant in the Museum of the 

 Boyal College of Surgeons. 



[Eeceived February 1, 1901.] 



(Text-figures 13-20.) 



The anatomy of CJilamydopJiorus has received so much attention 

 at the hands of various anatomists that the following notes of the 

 dissection of a specimen' need some apology. 



This small Armadillo is not only of extreme rarity, a fact that 

 in itself would warrant as many descriptions of its anatomy as 

 possible, but in certain of its features — particularly the dermal 

 armature— is so remarkably aberrant, that the determination of its 

 relation to the other Edentates becomes a matter of peculiar 

 interest. There seems little doubt that, from their general similarity 

 of structure, the Armadilloes should all be grouped within one 

 family, and that, M'ithin this family, Chlamydophorus lies some- 



1 I owe the opportunity of dissecting this specimen to the kindness of Mr. F. 

 W. Lucas to whom it belonged, and of Prof. Stewart who entrusted me with it. 



