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HALL 20. 
VERTEBRATE ZOOLOGY. 
Entrance from Hall 19. 
Case 58. — First and lowest class of the Vertebrates, the 
Tunicatay or sea-squirts, represented by several beautiful glass 
models. In the same case, on the next shelf above, is a single 
representation of the class Marsipobranchii, the Lamprey. 
Cases 58 and 50. — The first group of true fishes {Class 
Pisces), the sub-class Elas 77 iobranchii , or sharks and rays. Among 
the more important members of this group are the Hammer-head 
Shark and the specimen of the torpedo. 
Case 60. — In this Case are the two remaining sub-classes of 
Pisces {Ganoidea and Teleostei), among which are found the Elec- 
tric Eel from the Orinoco River, a large gar-pike, several speci- 
mens of perch, herring, and mud-fish, and a beautiful specimen of 
the sword-fish. In the left hand end of Case 59 is exhibited the 
class Batrachia represented by several specimens of the sala- 
manders. 
Case 61. — The collection of Reptiles (Class Reptilia), con- 
sisting of lizards, snakes, turtles, and crocodiles. Of special 
interest are the large Indian Python, the rattle-snake, the tor- 
toise, chameleon, iguana, and crocodile. 
Case 62 A. — The lowest order of Mammalia (Order Mono tre- 
mata) represented by two specimens each of the Duckbill Platypus 
and the Echidna. The Duckbill is curious from the fact that it 
lays an egg, has webbed feet, and the bill of a duck. 
Case 62B. — The Marsupials (Order Marsupialia) are rep- 
resented by the kangaroo and the opossum. The specimen of the 
female kangaroo, carrying its young in its pouch, and the Virginia 
Opossum, carrying its young on its back, are of special interest. 
Case 63. — The Order Bruta (Edentata), represented by 
the ant-eaters, the armadillos, and the sloths. 
Case 64:. — The Order Glires (Rodentia), consisting of the 
squirrels, rats, mice, and rabbits. Of special interest are the 
