394 



ZOOLOGY 



neural groove, the groove which marks 

 in the vertebrate embryo the devel- 

 oping central nervous system, 261. 



nodulous, covered with nodules or 

 little lumps, 175. 



notochord, the axial supporting rod of 

 chordates, 249. 



wsophaaus, the gullet, the part of the 



food canal leading to the stomach. 

 operculum, in gastropods, the horny 



plate which closes the aperture ; in 



fishes, the gill-cover, 232. 

 oviduct, the duct which carries eggs 



from the body, 120. 

 oviposit, to lay eggs, as in insects, 53. 



palatine, of the palate or roof of the 

 mouth ; name of a pair of bones 

 forming the palate, 232. 



pallial line, streak formed in a bivalve 

 shell by the margin of the attached 

 mantle. 



pallial sinus, an incurving of the pal- 

 lial line to receive the siphon in cer- 

 tain lamellibranchs. 



palp, a secondary sensory outgrowth 

 of a mouth part of an insect, 59. 



paraylossse, a pair of small appendages 

 of the under lip of insects, 59. 



parapodia, the paddling feet of poly- 

 chsetes, 147. 



parasitic, living on the nutritive juices 

 elaborated by another organism. 



parasphenoid , a bone occupying the 

 base of the skull, 267. 



parietal, bones of the middle upper 

 part of the brain case, 232. 



pectinate, comb-like. 



pectoral, of the chest ; the chest limbs 

 of fishes, 246. 



pedicellarise, minute forceps-like or- 

 gans found on some echinoderms, 



pelvic Jin, or ventral fin, the hinder 



paired appendages of fishes, 246. 

 penultimate, next to the last. 

 percoid, like a perch. 

 perisarc, the outer tough skin of hy- 



droids, 211. 

 pharynaeal, relating to the pharynx 



or throat, 252. 



polyp, the sessile form of coelenterates. 

 posterior, situated behind. 

 premaxilla, the most anterior tooth- 

 bearing bone of the upper jaw of 



fishes, 232. 

 preopercular, the most anterior of the 



bones of the operculum of fishes, 



232. 

 primaries, the large feathers on the 



distal joint of a bird's wing, 315. 

 proboscis, in insects, a sucking tube 



connecting with the mouth, 61. 

 prostermun, the most anterior of the 



ventral plates in the thorax of in- 

 sects, 59. 

 prostomium, in worms, a lobe of the 



body projecting above and in front 



of the mouth. 

 prothorax, the most anterior of the 



segments of the thorax of insects, 



59. 

 pseudobranch, in fishes, a rudimentary 



gill in front of the first throat slit, 



231. 

 pseudopodia, retractile processes in 



Protozoa. 

 pterotic, one of the ear bones of fishes, 



232. 

 pteryyoid, a bone of the base of the 



cranium, 232. 

 pupa, a stage in insect development 



preceding the imago, 11. 



quadrate, a bone lying between the 

 skull and the hinge of the lower jaw 

 in fishes, 232. 



