No. 2.] SCAPULAR AND PELVIC ARCHES. 237 



Scapular and pelvic arches present. Anterior and posterior 

 limbs present, external, very rudimental, and undivided. 



Scapular arch. All the elements present. Sternum cartilagi- 

 nous, with two costals ; clavicles osseous, proximally simple. 

 Interclavicle a simple, longitudinal, bony splint. Scapula and 

 coracoid distinct ; only ossified on their posterior borders. Cora- 

 coid and procoracoid cartilages not distinct, nor enclosing any 

 fontanelles. Anterior limb consisting of a humerus with a 

 minute cubital segment. 



Pelvic arch. Elements present subequal ; the inferior directed 

 forwards, meeting on the middle line, without longitudinal con- 

 nection. Ilium directed slightly forwards and upwards, and 

 articulating by its proximal extremity with the fused distal 

 extremities of the diapophyses of two vertebras. Posterior 

 limb exactly like the anterior ; i.e. consisting of a proximal 

 element (femur) and a distal rudimental segment. 



Fiirbringer, I.e., describes and figures the shoulder and pelvic 

 girdles of Acontias meleagris and A. phimbens. The shoulder 

 girdles consist of simple elements supposed to represent scapulae, 

 fused or not on the middle line, the median portion of which, in 

 the A. plumheus, it is suggested, may be clavicles. The pelvic 

 girdles consist, in both species, of a simple element on each 

 side, consisting of ilium (joined to vertebrae) and supposed 

 pubis. My examination of Evesia shows the impropriety of 

 combining that genus with Acontias, as has been done by 

 Boulenger. 



Anelytropsid^. 



Anelytropsis papillosus Cope. PI. XIII, Fig, 11. From 

 Eastern Mexico. Not previously examined. 



No scapular arch ; pelvic arch rudimental ; no external limbs. 



Pelvic arch. This is represented by two elements, — a proxi- 

 mal and a distal. The former is directed downwards and for- 

 wards. Its proximal extremity is articulated with a single 

 simple diapophysis, from which it extends a short distance 

 posteriorly in a horizontal direction as far as the posterior 

 extremity of the centrum of the same vertebra. From the inner 

 side of its distal extremity there extends posteriorly a simple 

 rod-like bone, to a point in line with the anterior margin of the 

 vent. Its length is about equal to that of the superior element. 



