164 DR G. W. LEE ON 



Khynchonellid^e. 



The collection contains only a few and totally indeterminable fragments of 

 Rhynchonellids. 



Athyrid^e. 



Athyris ? spp. indet. (PI. I. figs. 20, 21.) 



The Athyrids are represented by a few small specimens referable to two distinct 

 forms. Their shape is very depressed, but as this character appears to be partly due to 

 crushing, they had better be left undetermined. 



Genus Camarospira Hall and Clarke. 



Camarospira ? sp. (PL I. figs. 22-22c£.) 



A small Brachiopod exhibiting remarkable internal features appears to be specially 

 abundant in the Cape Cherney Limestone ; unfortunately, none of the specimens 

 obtained is complete enough to permit of a satisfactory determination. 



Externally, the shell has an athyroid aspect, but the pedicle- valve is much larger 

 than the brachial one, and has a high and apparently incurved beak. The brachial 

 valve is much flatter than the pedicle-valve, and its umbo is very low. The hinge-line 

 is arcuate, and the cardinal area appears to be obscure, but the shoulders are well 

 marked. The apical region being broken in all the specimens, the presence or absence 

 of a foramen could not be determined. 



Both valves are evenly convex but for a faint depression in the anterior portion of 

 the pedicle-valve, and a certain mesial gibbosity in the brachial valve. 



The shell is quite smooth, and its structure is fibrous and impunctate. 



Internally, the pedicle-valve is characterised by highly developed and strongly 

 convergent dental plates uniting to a high septum and thus forming a spondylium 

 which extends to about three-fourths of the length of the shell. The supporting septum 

 appears to reach the frontal margin, so that longitudinal splitting is common among 

 the specimens observed. 



Of the brachial valve, two specimens only were available for study. There is no 

 evidence of a spondylium ; but a septum, the dimensions of which could not be 

 estimated, is present and exhibits a thin black median line. The nature of the latter is 

 not easily explained, since the septum does not seem to be the result of the joining 

 together of septal plates. 



The articulating process could not be satisfactorily studied ; it appears, however, 

 to be very robust for a shell of this size — the largest specimen observed being only 

 12 mm. long. 



The only Brachiopod to which this species bears some structural resemblance is the 



