402 



Dlf. W. T. CALMAN ON 



Xylotrya capensis, sp. 11. (Text-figs. 9, 10, & 11.) 



Locality. Simon's Town, South Africa. Specimens forwarded 

 l.y Lieut. L. H. A. Shadwell, R.N.Y.R., Officer in charge of 

 Works, H.M. Dockyard. From Blue Gum timber, Ordnance 

 Jetty, E yard, and from Pitch Pine, Old Ordnance Jettj'-, E yard. 



Description. — Valves of shell (text-fig. 9) with dorsal outline 

 not steeply sloping posteriorly, where it is defined from the 

 auricle by a shallow concavity. The auricle is very deep, exceed- 

 ing half the total depth of the valve and extending downwards- 



Text-fioure 10. 



J^ylotrya ca])ensis, sp. ii. Syntype from Simon's Town. 



A. Distal portion of pallet. B. Stalk of pallet. C. Single segment 

 of pallet, further enlarged. 



for about half the distance from the anterior notch to the venti^al 

 edge. The lines of growth on the auricle are rather closely set 

 and not conspicuous on the inner surface. The anterior border 

 of the auricle on the inside overlaps as a broad band, which is- 

 distinctly raised from the inner surface. The pallets (text-fig. 10) 

 have the segments thin and fragile and closety set, the average 

 interval being estimated at one-sixth of the width. The distal 

 margins of the segments are regularly crescentic (on the outer 

 sui'face) with a broad striated membranous border but without 



