Type-specimens of Puecilasma carinatum. 



403 



concentrically striated (fig. 1, B). Tergum (fig. 1, A) with 

 carinal margin rather less than half as long as oecludent 

 margin and inclined towards it above. Carina (fig. 1, A, 0) 

 evenly arenate, upper portion narrow, its transverse width 

 above not more than one-twelfth of the length of the valve ; 

 sides expanded in the lower third ; septum concave, the 



Fig. 1 



Megalasma (Glyptelasma) carinatum (Iioeli), holotype. 



A. Valves of the capitulu.ni, lateral view. B. Basal angle of scutum, 

 inner surface. C. Carina, inner surface. 



lateral lobes projecting as seen from the side ; basal margin 

 forming a slightly convex curve with that of the scutum 

 when the valves are in their natural position and viewed 

 from the side. 



Dorsal surface of prosoma provided with long filamentary 

 appendages arranged in two series (c/. fig. 3). The exact 



27* 



