SCOTT : LITOPTERNA OF THE SANTA CRUZ BEDS. 



51 



The tarsus (PL VI, fig. 2), so far as it is preserved, does not differ in 

 any important manner from that of L. floweri; the distal end of the cal- 

 caneum has a somewhat narrower and less oblique facet for the cuboid. 



Metatarsal III is somewhat shorter than in L. floweri and relatively 

 rather broader and more compressed planto-dorsally, and more flattened 

 on the plantar side. The phalanges of this digit resemble those of Dia- 

 diaphonis, except that the proximal one is thicker and has on its dorsal 

 face a more prominent tubercle for the extensor tendon. 





Measurements. 









Femur, length from head 



.192 



Mt. Ill, 



length 



.... 



.082 



" " " grt. trochanter 



.205 



ti (( 



distal width 



.025 



" proximal width 



.058 



Digit III, phalanx i, length . 



.044 



distal width 



.048 







I, proximal width 



.0285 



Tibia, length (exclusive of spine) 



•175 







I, distal width . 



.020 



" distal width 



.031 







2, length . 



.018 



" thickness . 



.027 







2, proximal width 



.024 



Astragalus, length 



.0385 







2, distal width . 



.021 



" width of trochlea 



.02I 











Locality. — The type-specimen was collected by Mr. Hatcher on the 

 west shore of Lake Pueyrredon. 



This species is named in honor of M. Taylor Pyne, Esq., Litt.D., to 

 whose liberality the Patagonian Expeditions are much indebted. 



LiCAPHRiUM PARVULUM Ameghiuo. 



(Plate VII, Fig. s.) 



Licaphrium parvuhim Amegh.; Enum. sistematica, etc., 1887, p. 20. 

 Licaphrium arenavum Mercerat ; Rev. del Museo de La Plata, T. II, 1891, 

 p. 460 [fide Ameghino). 

 The type of this species is a single tooth (mg), measuring 15 X 8 mm., 

 which is distinguished by its small size and by the prominence of its talon. 

 A cast of another specimen, a fragment of the maxillary with the three 

 molars, kindly sent me by Dr. Ameghino, shows that m- is of the type of 

 L. pyramidatum, on a smaller scale, the posterior cingulum curving up to 

 join the apex of the single, large internal cusp. The mandibular teeth 

 which accompany this second specimen are, without doubt, referable to 

 Proterotheriitm. The cast has the following dimensions. 



