Vol. 4] Sinclair. — Mammalia from Quaternary Caves. 155 



Third inferior molar No. 8704, anteroposterior diameter at 



triturating surface 12 



Third inferior molar No. 8704, transverse diameter at triturat- 

 ing surface 15 



Superior molar No. 8337, antero-posterior diameter at triturat- 

 ing surface 12.5 



Superior molar No. 8337, transverse diameter at triturating 



surface 15 



MEGALONYX SIERRENSIS, 11. Sp. 



PI. 20, Figs. 5-8; PI. 21, Figs. 1 and 2; PL 22, Figs. 1-3. 



Type. — A lower jaw, in the Harvard Museum of Comparative Zoology, 

 Cambridge Mass., and No. 8130, Univ. of Cal. Palae. Coll. Left 

 scapula, seapho-trapezius, trapezoid and magnum ; right ealcaneum 

 and navicular; several imperfect metatarsals; a broken claw; part 

 of the tibia; several vertebrae and numerous fragmentary bones. 

 The Harvard specimen and the material at the University of Cali- 

 fornia belong to the same individual. 

 Locality. — Mercer's cave, near the town of Murphys, Calaveras County, 

 California. 



A part of the remains of this sloth were found when Mercer's 

 eave was first discovered. The mandible was presented to the 

 Harvard Museum of Comparative Zoology in 1887 by Mr. 

 Z. A. Willard. A broken tibia, a calcanenm and some other 

 fragmentary bones lay on a block of limestone to which they 

 were cemented by stalagmite, and were for years an object of 

 eurosity to persons visiting the cave. Through the kindness 

 of Mrs. Mercer, these were presented to the University of Cali- 

 fornia in 1901, and permission was obtained by Professor J. C. 

 Merriam to search for additional material. At Professor Mer- 

 riam's request, the writer visited the cave during the summer of 

 1902, securing several fairly complete bones, notably the scapula, 

 a number of podial elements and a few vertebrae. The bones 

 were found in the crevices between large limestone blocks in 

 the narrow part of the cave above the chamber known as "The 

 Flower Garden." Some were fairly well preserved, being 

 coated with stalagmite, others were exceedingly soft and spongy, 

 and a large amount of the material was too fragmentary to 

 be of use. 



The cave is developed along a fissure, running parallel with 

 the strike of the Carboniferous limestone. Radiating from the 

 present entrance there is an earth fan, but deeper down the 



