1 8 GLOSSARY. 



Bry'ozoa (Or. bruon, moss; zoon, an animal). Another name 

 for the Polyzoa, which group of Invertebrata includes the 

 sea-mats, &c, 



Buc cal (L. bueca, the mouth). Relating to the mouth, as the 

 buccal glands. 



Buc'cinator (L. bucca, the mouth, or buccino, to sound a trum- 

 pet). A muscle which forms a large part of the wall of 

 the mouth, and is chiefly employed in blowing. 



Bulb (L. bulbils, an onion). An underground bud covered 

 with scales. 



Bui bivestl bull (L.vestibular bulbs). Two leech-shaped masses 

 containing veins, situate in the vestibule of the human 

 female reproductive organs. 



Bol'bus arteriosus (L. arterial bulb). The portion of the 

 heart which in some animals, and in all vertebrate em- 

 bryos, intervenes between the ventricle and the arteries, 

 and which is usually rhythmically contractile. 



Bul'la (L. bulla, a bubble). The convex osseous wall which 

 bounds the tympanum in some Vertebrata. 



Burr. A circular ridge which appears on the horn of deer, &c. 



Bur sa (Gr. a leather bottle). A pouch ; a membranous sac 

 containing fluid, interposed between parts which arc sub- 

 ject to movement on one another to reduce friction. 



Bur'sa Entia'na. The duodenal segment of the intestine in 

 Elasmobranch fishes. 



Bursalis (L. bursa, a pouch). A muscle, which in lizards is 

 attached to the inner posterior wall of the orbit, and in 

 birds to the sclerotic coat of the eye. 



Byssus (Gr. bassos, flax). A cluster of silky threads by which 

 the sea-muscle and other Lamellibranchiata attach them- 

 selves to rocks. 



Cadaveric (L. cadaver, a corpse). Corpse-like. Cadaveric 



rigidity is the stiffening of the muscles, or rigsr nwrtis 



which takes place after death. 

 Cao cum (L. eaeus, blind). The blind intestine, a diverticulum 



from the intestine proper in the Vertebrata. 

 Calamus (Gr. kahunas, a reed). The quill of a bird's feather. 

 Calamus scriptorius (L. a writing-pen). The angle formed 



by the divergence of the posterior pyramids of the medulla 



oblongata. 



