76 GLOSSARY. 



Lo'cus ni'ger (L. black place). A layer of dark matter in each 



of the crura cerebri of the brain. 

 Lo'cus perfora'tus antfcus (L. anterior perforated space). A 



depression near the entrance of the Sylvian fissure of the 



cerebrum. 

 Lo'cus perfora'tus posti'cus (L. posterior perforated space). A 



deep depression between the peduncles of the cerebrum. 

 Longis'simus dor' si (L. longest muscle of the back). A large 



dorsal muscle of the trunk in the higher Vertebrata. 

 Lon'gus col'li (L. long muscle of the neck). A muscle of the 



neck situate in front of the vertebral column. 

 Ldphobran'cMi (Gr. lophos, the neck; branchia, a gill). A 



group of Teleostean fishes. 

 Lo'phophore (Gr. lophos, neck; phoreo, I bear). The disc in 



the Polyzoa which bears the mouth. 

 Lophos'teon (Gr. lophos, neck ; osteon, a bone). The central 



keel-bearing ossification in the sternum of birds. 

 Lorica'ta (L. lorlca, a cuirass, corselet). A group of insecti- 

 vorous Edentates in which the dorsal region of the body is 



covered by a carapace. 



Lucerna'rida (L. lucerna, a lamp). A group of Hydrozoa. 

 Luette ve'sicale (Fr. uvula of the bladder). A slight elevation 



of the mucous membrane of the bladder. 

 Lum'bar (L. lumbus, the loin). Relating to the region of the 



loins. 

 Lum'bo-sa'cral plexus (L. lumbus, the loin; sacrum]. A plexus 



formed in the frog by the seventh, eighth, and ninth spinal 



nerves._ 

 Lumbrica'les (L. worm-shaped muscles). Four muscles of the 



digits of the manus and the pes. 

 Luna/re (L. moon-shaped bone). One of the bones of the 



carpus, sometimes called intermedium, also semilunare. 

 Lu'nula (L. little moon). The white crescentic portion near the 



root of a nail ; applied also to the thin parts of the margins 



of the semilunar valves of the heart. 

 Lymph (L. lympha, water). The colourless fluid absorbed 



from the tissues by the lymphatics. 

 Lympha'tics (L. lympha, water). The special absorbent vessels 



distributed over the system, exclusive of those of the small 



intestine which are usually termed lacteals. 

 Lyra (L. a lyre). A triangular striated portion of the corpus 



callosum of the brain. 



