GLOSSARY. 10 1 



Pas'seres (L. passer, passeris, a sparrow). According to the old 

 system of classification, an order of birds which included 

 the crows, swifts, woodpeckers, and cuckoos. 



Pata'gium (L. a border or band on a woman's dress). An 

 expansion of the integument which, in the Insectivora, 

 unites the fore limbs to the body, and extends as a web 

 between the digits. Also a fold of the integument which 

 in birds extends between the antebrachium, brachium, and 

 the trunk. 



Patella (L. a dish or plate). The knee-pan. 



Patel'lidae (L. patella, a dish or plate). The limpets, a family 

 of the Prosobranchiata. 



Pathe'ticus. The name sometimes given to the fourth pair of 

 cerebral nerves. 



Pec'ten (L. a comb). A vascular membrane, which in Lacer- 

 tilia, Crocodilia, Aves, and many fishes, projects from the 

 outer side of the globe of the eye into the vitreous humour. 



Pec'tines (L. combs). The comb-like appendages of the 

 second somite in the Arthrogastra. 



Pecti'neus (L. pecten, pectmis, a comb). A muscle passing from 

 the pubis to the femur. 



Pec'toral (L. pectus, the chest). Belonging to the region of 

 the chest, as the pectoral arch, or the pectoral fins of fishes, 

 which are those attached to the pectoral arch. 



Pectora'lis ma'jor (L. major pectoral). One of the ventral mus- 

 cles of the trunk passing from the sternum and ribs to the 

 humerus. 



Pectora'lis mi'nor (L. minor pectoral). A muscle passing from 

 the ribs to the coracoid bone or process. 



Pectostra'ca (L. pectus, the breast ; Gr. ostracon, a shell). A 

 group of the Crustacea having bivalve shells. 



Pe'dal (L. pes, pedis, a foot). A term applied to certain nerve 

 ganglia in the Mollusca, which supply fibres to the foot. 



Pe'dicel(L. pedlculus, a little foot). The basal part of the horn 

 in the Ruminantia ; also the ambulacral feet in the Holo- 

 thuridea. 



Pedicella'ria (L. pedicellus, a louse). Small pincer-like bodies 

 attached to the spines of the Asteridea, and which during 

 life are always twisting about and snapping. 



Pe'dicle (L. pedlculus, a little foot). The lower portion of each 

 side of the neural arch of a vertebra. 



Pediculi'na (L. pedlculus, a louse). A group of insects com- 

 monly known as lice. 



