140 



PATAGONIAN EXPEDITIONS I PALAEONTOLOGY. 



Fourth caudal, length 035 



" " width of anterior face . .020 



" " " over transverse 



processes 083 



Fifth caudal, length 036 



" " width of anterior face 020 



" " " over transverse pro- 

 cesses 058 



Sixth caudal, length 03 5 



" " height 030 



" " width of anterior face 018 



" " " over transverse processes .024 



Seventh caudal, length 033 



" " width of anterior face. .017 



" " " over transverse 



processes 036 



Eighth caudal, length 028 



" " width of anterior force .. .013 



" " " over transverse 



processes 022 



Ninth caudal, length 025 



" " width of anterior face 012 



" over transverse pro- 

 cesses 018 



Tenth caudal, length 022 



" " width of anterior face. . . .010 



" " height 007 



" " width over transverse pro- 

 cesses 015 



Scapula, breadth of neck 052 



" length of glenoid cavity 032 



" width " " " 02 1 



Humerus, length 159 



" width of proximal end 039 



" " " distal trochlea 034 



" " over epicondyles 052 



Radius, width of distal end 029 



" thickness of distal end 020 



Pelvis, length 281 



Ilium, length 151 



Pubis, length 1 24 



Acetabulum, antero-posterior diameter.. .035 

 " dorso-ventral diameter. . . .030 



Obturator foramen, length 08 1 



Femur, length from head 210 



" " " great trochanter .. .225 



" width of proximal end 08 1 



" " " distal end 056 



(N. B. As the anterior margin of the premaxillaries is broken, the measurements involving 

 this region are somewhat uncertain, but the inaccuracy must be very slight.) 



COCHLOPS Ameghino. 



(Plates XIX, XX, XXI, Fig. 5; XXIV, Figs. 12, 13; XXVIII, Figs. 1-4.) 



Cochlops Amegh.; Contrib. al Conoc. de los Mam. Fos. de la Repub. 



Argent., 1889, p. 792. 



Asterostemma Amegh., in part; Ibid., p. 822. 

 Propalaohoplophonis Mercerat, in part; Rev. del Museo de La Plata, T. 



II, 1891, p. 28. 

 Propalczohoplophorus Lydekker, in part; Anales del Museo de La Plata, 



T. Ill, 1894, p. 45. 



Although closely allied to Propalceohoplophorus, this is nevertheless a 

 well-defined genus. 



Exoskeleton. The cephalic shield (Plate XXI, fig. 5) is, like that of 

 the preceding genus, made up of separate plates, which, however, are 

 smaller and more numerous, about 30 in all, and are arranged accord- 



