NO. 1475. jsiE W FOSSIL SE. 1 L— TU I ll. ^ 3 y 



l>y Nordmann's ligures, it presents \qyy close similarity. It appears 

 to ditfer, however, in that the distance from the distal end of the 

 deltoid ridge to the trochlea is much less than in L. Irnis and that 

 the transverse breadth of the bone opposite the entepicondvlai- fora- 

 men is considerabl)^ less; the external face of the ridge appears to be 

 convex rather than concave. I have no hesitancy in referring J*l,n<n 

 viaeotlca to the genus LepfopJiova^ but it probably represents a spe- 

 cies distinct from Z. J<'jiis. 



Other bones from the Calvert Cliffs, Maryland, which are prol)ably, 

 but not certainl}', referable to Z. lenis are figured on Plate LXX\'I, 

 figs. 1-3. They consist of the proximal end of the conjoined right tibia 

 and fibula, a lumbar vertel)ra (last), and the right radius of a young indi- 

 vidual. These were collected by me at the same locality as the type of 

 Z. /e^/;/.y, and in size and general appearance suggest specific identity. 



The fragment of the tibia and fil^ula resembles the same part in 

 Phoca gr(tnla7idica^ but is somewhat smaller and more slender and 

 delicate. In its general conformation, however, it approaches nearer 

 to Ilalichce^'us^ especialh' in the position of the proximal end of the 

 fibula, which is on a level with the proximal end of the tibia, and in the 

 convexity of the internal face of the tibia. The anterior and posterior 

 faces of the tibia* are very deeply concave, the bone between them 

 being ver}" thin. 



The lumbar vertebra lacks the transverse processes and metapoph- 

 yses and the neural spine, but the neural arch is complete and the 

 anterior zygapophyses. From the shape and position of the portions 

 of the processes remaining, it is probal)le that the bone is the posterior 

 lumbar. It resembles the same vertebra in P. yroinlandica^ but is 

 considerably smaller, and the anterior zygapophyses are much more 

 concave and are directed upward rather than inward. The median 

 depression of the posterior epiphysis of the centrum is much below 

 the level of the depression of the anterior epiphysis. The radius 

 (right), which is that of a yoimg animal, lacks the head and distal 

 epiphysis. It presents no salient characters, except that the tuberosity 

 is large and is situated high up toward the neck. 



The dimensions of the foregoing bones are as follows: 



TlUa and jihula.—Toi2i\ length of fragment, 59 mm.; l)readth at 

 proximal end,' 51; transverse breadth of condyles, 41; antero-posterior 

 breadth of larger condyle, 26; of intertial surface of tibia, 21. 



Lnmhar veHehra.—ljQngth of centrum, 33 mm.; breadth of anterior 

 epiphysis, 27; depth of same, 23; vertical height of neural arch, 

 anteriorly, 12. 



^^;^7/,^;._Total length (head and epiphysis lacking), 78 nun. ; greatest 

 breadth at distal end, 30; at proximal end, 16; le ast diamete r of shaft, 13. 



«In a seal, as thejiind legs are directed backwanl, these surfaces are aetually 

 external and internal in relative po.«ition. 



