226 COPE. [Vol. VII. 



In the following pages descriptions of the scapular and pelvic 

 arches of the types referred to are given. 



DIPLOGLOSSA. 



ZONURID^. 



Mancus macrolepis Cope, from Natal. PI. XIII, Fig. i. 

 Not previously examined. Scapular and pelvic arches both pres- 

 ent. Anterior limbs, none ; posterior limb, an externally undivided 

 rudiment. Scapular ajxh. 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 cartilagi- 

 nous. Scapula and coracoid confluent, osseous ; procoracoid car- 

 tilage. 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 vertebrae. 

 Pubes slender, in contact anteriorly. Ischia directed anteriorly, 

 not forming a symphysis, but separated by a median osseous 

 element, which, following Baur,^ I call the hypogastroid bone 

 (Fig. I, Cy hg). This is produced anteriorly as a cartilage, which 

 joins the pubes, and posteriorly as a median simple cartilagi- 

 nous 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 length of the 

 femur, and a simple conical tarsal. 



PYGOPODIDiE. 



Pygopus lepidopus Lacep. PI. XIII, Fig. 3. Already de- 

 scribed in part by Heusinger,^ Cuvier,^ Miiller,* and Fiirbringer.^ 

 From Australia. 



Scapular and pelvic arches present ; no anterior, and rudi- 

 mental posterior limbs. Scapular arch. Elements present 

 except interclavicle. Sternum, a small longitudinally oval car- 



1 Afnerican Journal of Morphology, IV, 1 891, p. 345; where he names the epi- 

 gastroid, mesogastroid, and hypogastroid cartilages of the Testudinata. 



2 Zeitschr.fur Organ. Physik., Ill, h. 5, p. 489. 

 ^ Regne Animal. 



* Tiedemann u. Treviranus Zeitschr.f. Physiologic, IV, 1831, p. 227. 



5 Die Knochen u. Muskeln der Schlangendhnlichen Saurier, Leipsic, 1870. 



