486 REPORT OF NATIONAL MUSEUM, 1898. 



SYNOPSIS OF THE GENERA. 



I. Limbs well developed. 



A. Back with osteodermal plates. 



Dorsal scales large Zoniirns Merrem. 



AA. Back without osteodermal plates. 



Dorsal lepidosis heterogeneous Psetidoeordylus Smith. 



Dorsal lepidosis uniformly granular Platysaurus Smith. 



II. Limbs rudimentary, body serpentiform ; scales lanceolate, keeled. 



Limbs present; digits 5-5 Cricochalcis Wiegmann. 



Limbs present, undivided Chamasanra Schneider. 



No fore limbs ; hind limbs undivided Mancus Cope. 



The mesenteries in the geuus Zonurus are of the usual type. There 

 are one hepatoventral, a gastrohepatic, a left gastropulmonary, and a 

 right hepatic, which incloses the right lung. 



The hemipeuis I have only seen in the Zonurus cordylus. It is short 

 and swollen so that the spiral structure is accentuated. There is a rigid 

 welt opposite the sulcus, which leaves a triangular space at one side 

 proximad which is finely calyculate. On the opposite side of the welt 

 distad is a wide space with radiating lamina; from a smooth center. 

 The presence of calyculi noted is exceptional in the Diploglossa, and 

 Indicates approximation to the Pachyglossa as far as it goes. 



The arches and limbs of the degenerate species Mancus maerolepiSy 

 from Katal, have the following characters: Scapular and pelvic arches 

 both present. Anterior limbs, none; posterior limb, an externally 

 undivided rudiment. 



ScajJidar arch. — All the elements present. Sternum supporting three 

 haemal ribs on each side, deeply emarginate so as to be horseshoe- 

 shaped, with a short posterior prolongation; each branch cartilaginous 

 anteriorly. Suprascapula cartilaginous. Scapula and coracoid con- 

 fluent, osseous; procoracoid cartilage. Interclavicle cruciform, with 

 long posterior axis. 



Pelvic arch. — All the elements present, but small and slender. Ilium 

 attached to the distally confluent diapophyses of two vertebnie. Pubes 

 slender, in contact anteriorly. Ischia directed anteriorly, not forming 

 a symphysis, but separated by a median osseous element, which, fol- 

 lowing Baur, I call the hypogastroid bone. This is produced anteriorly 

 as a cartilage, which joins the pubes, and posteriorly as a median simple 

 cartilaginous rod. 



Posterior limb. — This is about as long as the pubis and half the ilium. 

 It consists of a femur, distinct but closely apposed tibia and fibula, 

 about three-fifths the lengtli of the femur, and a simple conical tarsal. 



PYGOPODID^. 



Scincoidiens Cuvier, part, Regne Anim., II, 1817, p. 52. 

 Gymnophthahnoidea Fitzinger, part, Neue Classif. Kept., 1826, p. 26. 

 Aittarchoglossce Wagler, part, Syst. Amph., 1830. p. 152. 

 Gymnophihalnti Wiegmanx, part, Herp. Mex., 1834, p. 5. 

 Scincoidiens Dum^ril and Bibron, part, Erp. G6n., V, 1839, p. 511. 



