GLOSSARY. 153 



Url'na san'guinis (L. urine of the blood). A term applied to 



the urine evacuated at times when neither food nor drink 



has been recently taken, as, for instance, that evacuated 



upon rising in the morning. 

 Urini'ferous tubes (L. urine-bearing tubes). The tubules in 



which the urine is secreted, and by which it is poured 



into the calyces of the ureters. 

 Uro-car'diac process (Gr. oura, the stern ; kardia, the stomach). 



A process of the cardiac piece of the stomach in some 



Crustacea. 

 TTro-car'diac tooth (Gr. oura, the stern ; kardia, the stomach). 



A process of the pre-pyloric ossicle in the stomach of 



some Crustacea. 

 TTro- chord (Gr. oura, the stern, tail; cJwrde, a string). The 



central axis in the Ascidioida. 

 Uro'dela (Gr. oura, the tail ; delos, distinct). A group of the 



Amphibia having a distinct and often long tail. 

 TTrogas'tric (Gr. oura, the stern, tail ; gaster, the stomach). 



The name given to two lobes of the carapace in the 



Brachyura. 

 TJrohy'al (Gr. oura, the stern; hyoid bone). The posterior 



ossification of the hyoidean arch in fishes. 

 Uropoie'tic (Gr. ouron, urine ; poietikos, making). A system 



of organs in the Invertebrata which are concerned in 



eliminating the nitrogenous waste from the blood. 

 Uropy'gial (Gr. oura, the tail ; pugaios, the buttocks). The 



name given to a gland which in many birds secretes an 



oily fluid spread by the bird over its feathers, the gland 



being situated in the integument which covers the coccyx. 

 TJrosa'cral (Gr. oura, the tail ; L. sacrus, sacred, the sacrum). 



A term applied to the ankylosed caudal vertebrae in 



birds. 

 TJ'rostyle (Gr. oura, a tail; stulos, a style, pen). A bony 



prolongation of the vertebral column in some fishes and 



amphibia. 

 TTtero-gesta'tion (L. uterus, womb ; gestatio, the being carried 



in a litter). The development of the embryo within the 



womb. 

 U'terus (L. the womb). The cavity in which the embryo 



remains during development. 

 U'terus mascull'nus (L. male womb). A portion of the male 



genital organs which in some Vertebrata represents the 



aborted uterus. 



