large. Therefore the outline mentions only a 
few of the most conspicuous. 
(1) The Agate Shells (Achatinidae). 
(2) The Naked Sea Slugs (Nudibranchiata). 
(3) The Shell-bearing Sea Slugs (Tectibranchi- 
ata. 
(4) The Cone Shells (Conidae). 
(5) The Olive Shells (Olividae). 
(6) The Whelks (Buccinidae). 
(7) The Volutes and Melon Shells (Volutidae). 
(8) The Murex Shells (Muricidae). 
(9) The Tritons and Frog Shells (Tritonidae). 
(10) The Helmet Shells. Cameo Shells (Cassi- 
didae). 
(11) The Cowries (Cypraeidae). 
(12) The Conch Shells (Strombidae). 
(13) The Horn Shells (Cerithiidae). 
(14) The Chitons (Polyplacophora). South side 
of Hall. 
c. The Tooth Shells. (Scaphopoda). 
d. The Bivalves. 
The outline mentions only a few of the most 
conspicuous families. 
(1) The Tellen Shells (Tellinidae). 
(2) The Piddocks (Pholadidae). 
1 (3) The Furbelowed Clams (Giant Clam) (Tri- 
dacnidae). 
(4) The Venus Clams (Veneridae) (Edible). 
(5) The Pearly Fresh-water Mussels (Union- 
idae). 
(6) The Three-Angled Clams (Trigoniidae). 
(7) The Ark Shells (Arcidae). 
(8) The Mussels and Rock-eaters (Mytilidae) 
(Edible). 
(9) The Wing Shells (Aviculidae) (Mother of 
Pearl Shells). 
(10) The Pen Shells (Pinnidae). 
(11) The Scallops. Comb Shells (Pectinidae). 
(12) The Thorny Oysters (Spondylidae). 
(13) The Oysters (Ostraeidae). > 
2. Insects. 
a. The Mulberry Silk Worm (Development). 
28 
