19 
Case 20. — Trochidce and Turbmidce (top -shells). 
Case 21. - Neritidce ; Naticidce ; Xenophoridce. 
Case 22. — Calyptrceidce (limpets); Ampularidce (apple- 
snails); Littorinidce (periwinkles). 
Case 2*3. — Melaniidce I'urritellidce ; Vermetidce (worm- 
shells, the shells being more or less contorted like worm tubes); 
Cerithiidce , Strombidce (conch-shells). 
Case 24. — Strombidce (continued); Cyprceidce (cowries), a 
family containing some of the most beautiful shells known. 
Case 25. — Ovulidoe ; Doliidce (tun-shells); Cassida (hel- 
met-shells). Tritonidce (triton- shells). 
Case 26. — Muricidce , a large family of mostly spiny and 
roughened shells. 
Case 27. — Muricidce , (continued); Nassidce (dog- whelks); 
Buccimdce (whelks); Turbinellidce , from Case 4, Hall 25. 
The visitor who wishes to examine the remainder of the mol- 
luscan collection may now enter Hall 25, where the series is con- 
tinued in Case 4 in the northeast corner of the hall. 
ALCOVES. 
Alcove 95. — Male elephant and young. 
Alcove 96. — Loggerhead turtle and leather back turtle. 
Alcove 97. — Skeletons of wapiti, hippopotamus, rhinoceros, 
camel, bottle-nosed whale, jaws of sperm-whale. 
Alcove 98.— Models of grampus, porpoise, etc. 
Alcove 99. — Mounted male wapiti and giraffe; giant crab 
from Japan. 
The main collection of mounted mammals is on exhibition in 
Halls 19 and 20, where they are arranged as systematically as pos- 
sible, beginning with the lowest families in Hall 19 and ending 
with the highest families at the west end of Hall 20. The cases 
are numbered in agreement with the arrangement of the collec- 
tion. 
