GLOSSARY. 155 



Vas spirale (L. spiral vessel). A small blood-vessel of the 



internal ear. 

 Va'sa afferen'tia (L. afferent vessels). The lymphatic vessels 



which enter the lymphatic glands. 

 Va'sa ambulacra'lia ca'vi (L. hollow ambulacral vessels). Di- 



verticula of the circular ambulacral vessel in the Ophiuridea. 

 Va'sa bre'via (L. short vessels). Small blood-vessels supplied 



to the stomach. 

 Va'sa efferen'tia (L. efferent or carrying-out vessels). Small 



vessels passing from the vascular network of the testicle to 



the epididymis. Also applied to the lymphatic vessels 



which pass out of the lymphatic glands. 

 Va'sa lac'tea or chylffera (L. lacteal or chyle-bearing vessels). 



The absorbent vessels of the small intestine. 

 Va'sa rec'ta (L. straight vessels). The straight vessels of the 



testicle which pass from the seminiferous tubules to the 



vascular network. Also small straight blood-vessels which 



lie between the uriniferous tubes of the kidney. 

 Va'sa vaso'rum (L. vessels of the vessels). The system of small 



blood-vessels which supply the coats of the arteries, veins, 



and lymphatics. 

 Va'sa vortico'sa (L. vortex-like vessels). Small veins of the 



choroid coat of the eye. 

 Vas'cular (L. vasculum, a little vessel). Having or belonging 



to vessels ; full of vessels. 

 Va'so-mo'tor nerves (L. vessel-moving nerves). Nerves derived 



from the sympathetic system, and governed by a vaso- 



motor nerve-centre in the medulla oblongata, which are 



supplied to the muscular coat of the small blood-vessels. 

 Va'so-peritone'al ve'sicle. A sac developed in the Holothuridea 



from the archenteron, and which subsequently gives rise to 



the ambulacral vessels and the peritoneum. 

 Vas'tus exter'nus (L. vastus, enormous ; fxternus, external). 



A large muscle of the thigh. 

 Vas'tus inter'nus (L. vastus, enormous ; internus, internal). 



A large muscle of the thigh. 

 Vein (L. vena, a vessel containing blood). A vessel which 



returns blood to the heart. 

 Ve'liger (L. velum, a sail; gero, I bear). A term applied to 



the embryo of some Mollusca, which is provided with a 



richly ciliated disc-like body. 



Velum (L. a sail). The ciliated disc-like fold of the inte- 

 gument with which some embryo Molluscs are provided. 



