l6o GLOSSARY. 



Wormian bones. Bones frequently found in the sutures of the 

 skull. 



X. 



Xan'thocroi (Gr. xanthos, yellow, auburn ; chroma, colour). 

 A group of the human race which includes the Slavonians, 

 Teutons, Scandinavians, and fair Celts. 



Xiphiplas'tron (Gr. xiphos, a sword ; plastos, moulded, formed). 

 The fourth lateral piece of the plastron in the Chelonia. 



XTpbisternum (Gr. xiphos, a sword ; stemon, the breast). The 

 posterior portion of the sternum, also termed in man the 

 ensiform cartilage. 



XTphoid cartilage (Gr. xiphos, a sword ; eidos, shape). Sword- 

 like. Applied to the xiphistennun. 



Xiphosu'ra (Gr. xiphos, a sword; oura, a tail). An order of 

 the Crustacea only represented at the present day by the 

 king-crabs, which have long sword-like tails. 



Zoan'thodeme (Gr. zoon, an animal ; anthos, a flower). The 



whole group of zooids in the Actinozoa produced by the 



budding of a single polype. 



Zo'ea (Gr. zoe, life). The larval form of some Crustacea. 

 Zo'na dentl'culata. Toothed belt. 

 Zo'na glomerulo'sa (L. zona, a girdle ; glomcrosus, to make into 



a ball). The outer layer of the cortical part of the supra- 

 renal bodies. 

 Zo'na orbicula'ris (L. orbicular zone). A thick broad band of 



circular fibres in the capsular membrane of the hip-joint. 

 Zo'na pectina'ta. Comb-like belt. 

 Zo'na pellu'cida (L. bright transparent belt). The membrane 



enclosing the yolk of the unimpregnated ovum. 

 Zo'na reticula'ris (L. net-like belt). The inner layer of the 



cortical part of the supra-renal bodies. 

 Zona'ria (L. zona, a maiden's girdle, belt). A division of the 



Mammalia, so called from the shape of the placenta. 

 2o'nula of Zinn (L. little belt of Zinn). The folded zone formed 



by the suspensory ligament of the lens of the eye. 

 Zooglae'a (Gr. zoon, an animal; glia, glue). The term applied 



to the resting, motionless stage of the Bacteria, in which 



they are embedded in gelatinous material. 



