BRACHIOPODA. 
77 
The sexes are usually separate. The reproductive cells are 
formed in the body-cavity. The embryo swims freely for a short 
Fig. 3. 
Magellania flavescens. (After Davidson.) 
A. Interior of dorsal valve to show the " arms " ; some of cirri removed on right 
side ; v, mouth. B. Longitudinal section, with a portion of the animal. 
time before settling down and becoming fixed. The specimens 
exhibited in the case are arranged according to the following 
classification : — ■ 
! Order 1. Atremata. Fam. Lingulidx. 
_ . _ ,__ . , ( Fam. JDiscinidss. 
Order 2. Neotremata. { ^ n .., 
1 Fam. Cramidse. 
Order 3. Protremata. 
Section II. Akticulata. 
Fam. TJieeidiidas. 
(Fam. Bhynchonellidx. 
Fam. Terebratulidss. 
Fam. Terebratellidas. 
Section I. — Inaeticulata. 
Order 1. — Ateemata. Family Lingulidm. — The Lingulas possess 
emerald green or golden brown duck-bill-shaped shells. Having no 
