REPTILES. 95 



THE TRUE EEPTILES. 



1. " SATJRIA ANNULATA." The Amphisbana. 

 A. With a rudimentary Shoulder-girdle, but no Sternum. 

 Example 1. Amphisbtsna fuliginosa, Linn. 



Each moiety of the Shoulder-girdle is a small cylindrical bone of a dark brown colour, and 

 one line long by one eighth of a line thick in the adult ; direction almost vertical, but turned 

 obliquely downwards and inwards ; this is evidently a " coraco-scapula," not cleft either vertically 

 or transversely (see transl. of Rathke, p. 90). 



Example 2. Ampltisbcena alba, Linn. 



Each moiety of the Shoulder-girdle is like a small phalangeal bone, the ends being clubbed, 

 and the middle rather pinched ; length in the adult as in the last, but one fourth thicker ; colour 

 white ; morphological nature, a " coraco-scapula" (see transl. of Rathke, p. 90). 



Example 3. Lepidosternon microcephalum, Spix. 



The length of each moiety in the adult is the same as in Amphisbana alba, butthe breadth 

 is twice as much, namely, one* third of a line. The piece is bean-shaped, and placed with the 

 long diameter vertical to the axis of the body ; white in colour ; nature, " coraco-scapula" (see 

 transl. of Rathke, p. 90). 



Example k.Trogonophis Weigmannii, Kaup. 



The moieties of the Shoulder-girdle are similar to those of Amphisbasna fuliginosa, but 

 larger, and meet each other below (see Rudolph Wagner's 'Icones Zool./ Leipsic, 1841, 

 pi. xiii, figs. 20 and 22 (and transl. of Rathke, p. 91). 



B. Possessing both Shoulder-girdle and Sternum. 

 Example. Chirotes canaliculatus, Cuv. 



Rathke (see p. 91) had not seen a skeleton of this Amphisbsenian, which has small fore feet and 

 a highly developed Sternum ; but I am happy in having access to the skeleton of an adult male 

 from Mexico, in the Hyrtlean collection now enriching the Hunterian Museum. 



My figures are given in Plate VIII, figs. 8 10. They are magnified nine diameters ; 

 fig. 8 shows the Shoulder-girdle and Sternum in situ; fig. 9 the outer view; and fig. 10 the inner 

 view of the left Shoulder-plate. 



