112 



Radial Basivenale convex; moderately broadly open; discontinuous with radial stem; 

 angled antero-proximad; rectangular. Proximal arch slenderly deltoid; curved postero- 

 distad. Anterior section strikingly reduced by a greatly enlarged br; discontinuous with 

 the anterior margin of BR. Posterior margin weakly concave; surrounds the BMA arch 

 apex. Postero-distal margin truncate. Anterior margin depressed below the posterior 

 margin of ScA bulge; narrow; convex; angled antero-proximad. Embayment normal size. 

 Distal arch discontinuous with radial stem; moderately broad; convex; broadly curved 

 proximad; oriented postero-proximad. br strongly sclerotized; occupies about one-third of 

 the proximal arch; discontinuous with BR. br projection moderately narrow; concave; 

 distinct from BScA. 



Second Basal Plate (Fig. 183) 



MA-BMA Junction absent. - MP-BMP Junction: MP broadly continuous with BMP; arises 

 from below the BMP-BCuA brace. - Crimp Patterns absent. - BMP-CuA Brace absent. 

 - BMP-BCuA Brace present but modified; discontinuous with BMP; entire and greatly 

 strengthened; extends posteriad; anteriorly enlarged; convex; distinct from BMP. Terminus 

 fused to a deep concavity on the disto-medial section of BCuA. Point of fusion 

 discontinuous. 



Medial Basivenalia reduced proximally. BMA broadly scaphoid; completely fused to BMP. 

 Proximal surface convex. Medial and distal surfaces planate. Anterior margin weakly 

 concave. Proximal arch moderately long; planate and straight; oriented proximad; strongly 

 curved ventrad. Apex terminates below BR proximal arch apex. Distal arch indistinct; 

 fused to the proximal section of BMP. BMP junction with BMA discontinuous and very 

 broad; fused to brace; markedly convex; separated from both IBP and BCu by membrane. 

 Proximal section broadly deltoid; planate; slopes ventro-distad. Distal section 

 indistinguishable from BMP-BCuA brace; long; broad; rectangular; strongly convex. 



Cubital Basivenalia moderately broadly fused. Postero-proximal margin of BCuA fused 

 with the anterior margin of BCuP. Suture line present. BCuA narrow and long; convex; 

 oriented distad; lies posteriad of BMP; strongly sclerotized. Anterior margin with a 

 moderately broad extremely deep concavity. Distal margin continuous with CuA. BCuP 

 very weakly deltoid; convex; oriented postero-distad; moderately sclerotized. Distal 

 embayment moderately broad and deep. - Cubitus Anterior fused to BCuA. Junction 

 marked by a distinct suture. 



Basalare (Fig. 184) 



Head - HP lobe large; continuous with neck. Apex broadly truncate. Dorsal surface weakly 

 elevated from neck; not polished. BScP lobe claviform; weakly projects posteriad from 

 neck. Dorsal surface weakly rectangular; weakly convex; polished; depressed from neck; 

 slopes ventrad. Ventral surface polished. - Posterior Subcostal Basivenale weakly deltoid: 

 polished. 



