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4. Amyda mutica (Lesuer). Unarmed soft-shell turtle. 
Hab. Mississippi Valley. 
One specimen. Received in exchange from Mr. 
Julius Hurter. 
Lacertilia : 
5. Thecadactybis rapicaudus Gray. Croaking gecko. 
Hab. Tropical America. 
One specimen from Jamaica. Presented by Mr. J. 
W. Moore 
6. Tiliqua scincoides (White). White's cyclodus. 
Hab. Australia. 
One specimen. Purchased. 
Ophidia : 
7. Xiphosoma rucshenbergeri Cope. Ruschenberger's 
tree boa. 
Hab. Tropical America. 
One specimen of this rare serpent was received from 
Trinidad in exchange. 
8. Epicrates cupreus Fisch. Coppery tree boa. 
Hab. Tropical America. 
One specimen of this species, also of much rarity, was 
received from Trinidad by purchase. 
As might be inferred from their slender and more 
active form, the Xiphosomas are much more truly 
tree boas than the Epicrates. Specimens of E. 
angulifer, E. cenchria, and E. cupreus which have 
been kept in the collection, rarely ascend the trees 
in their cages, and on no occasion have they been 
observed to remain there for any length of time. 
Xiphosoma hortulana and X. ruschenbergeri, on the 
contrary, are rarely on the ground, the last-named 
specimen remaining coiled among the branches for 
weeks at a time. 
9. Tropidophis macidatus D. and B. Carinated tree boa. 
Hab. West Indies. 
