GLOSSARY. 19 



Calca'neum (L. calx, the heel). The bone of the tarsus, which 



in man forms the heel. 

 Cal'car (L. a spur). The prominence on the anterior edge of 



the pes of a frog. The " spur " of some birds. Also a 



spur-like process in the Rotifera. 

 Cal'car a'vis (L. a bird's spur). The curved eminence in the 



lateral ventricles of the brain, usually called the hippocam- 

 pus minor. 

 Calca'reous (L. calx, lime). Composed of lime or salts of 



lime. 

 Cal'carine sul'cus (L. calcar, a spur; sulcus, a furrow). The 



furrow of the cerebral hemispheres, which, by its projection 



into the lateral ventricles, gives rise to the hippocampus 



minor. 



Cal'ciform (L. calx, a pebble). -Pebble-shaped. 

 Calcispon'giae (L. calx, lime ; spongia, a sponge). The sponges 



with calcareous skeletons, a division of the Porifera. 

 Callo'sal gy'rus (L. callosus, having a hard skin ; gyrus, a circle 



made by running). One of the cerebral convolutions. 

 Callo'sity (L. callosus, having a hard skin). A hardening of 



the integument. 



Callo'so-mar'ginal suTcus. The sulcus or furrow which sepa- 

 rates the marginal from the callosal cerebral convolution. 

 Calorifa'cient (L. calor, heat; facio, I make). Heat-producing. 

 Calyx (Gr. kalyx, a cup, chalice). The outer whorl of floral 



leaves in a flowering plant The expanded termination of 



the ureters in the kidney, which receive the urinary 



secretion from the urinary tubules. Also the " cup " of a 



Crinoid, or of Vorticella. (Plural, calyces.) 

 Cam'bium. A tissue composed of mucilaginous cells placed 



between the bark and young wood, or round the vessels of 



exogenous plants. 

 Camelidae (Gr. kamelos, a camel). The subdivision of the 



ruminants which embraces the camels. 

 Canali cuH (L. little canals). The canals in bone which contain 



the blood-vessels. A term for any small channel. 

 Cana'lis anricula'ris (L. the auricular canal). The constriction 



between the auricular and ventricular parts of the foetal 



heart. 

 Cana'lis centra'lis (L. central canal). The central canal which 



runs through the spinal cord. 

 Cana'lis centra'lis modio li (L. central canal of the modiolus). 



The largest of the canals in the modiolus of the ear. 



