334 GLOSSARY. 



Polyzoa in which the mouth is devoid of the valvular structure known as 



the " epistome." 

 GYM-NO-PHI' O-NA (Gr. gumnos, naked; ophis, a snake). The order of the 



Amphibia, comprising the snake-like Cwtilice. 

 GYM-NOPH-THAL'MA-TA (Gr. gumnos f and ophthalmof, the eye). Applied by 



Edward Forbes to those Medusae in which the eve-specks at the margin of 



the disc are unprotected. The division is now abandoned. 

 GYM-NO-SO'MA-TA (Gr. gumnos ; and somo, the body). The order of Pteropoda 



in which the body is not protected by a shell. 

 GYN'O-PHORES (Gr. gune, woman ; phero, I carry). The generative buds, or 



gonophores, of Hydrozoa, which contain ova alone, and differ in form from 



those which contain spermatozoa. 

 GY-KEN-CEPH'A-LA (Gr. guroo, I wind about j egTcephalos, brain). Applied by 



Owen to a section of the Mammalia in which the cerebral hemispheres are 



abundantly convoluted. 



ILa'MAL (Gr. haima, blood). Connected with the blood-vessels, or with the 

 circulatory system. 



H.E-MA-TOC RY-A (Gr. haima, blood ; kruos, cold). Applied by Owen to the 

 "cold-blooded" Vertebrates viz., the Fishes, Amphibia, and Reptile*. 



HJS-MA-TO-THER'MA (Gr. haima, blood ; thermos, warm). Applied by Owen to 

 the "warm-blooded" Vertebrates viz., Birds and Mammals. 



HAL'LUX (Lat. allex, the thumb or great toe). The innermost of the five 

 digits which normally compose the hind foot of a Vertebrate animal. In 

 man, the great toe. 



HAL-TE'KES (Gr. halteres, weights used by athletes to steady themselves in 

 leaping). The rudimentary filaments or " balancers " which represent the 

 posterior pair of wings in the Diptera, an order of Insects. 



HAUS'TEL-LATE (Lat. haurio, I drink). Adapted for sucking or pumping up 

 fluids ; applied to the mouth of certain Crustacea and Insecta. 



HEC-TO-COT Y-LTJS (Gr. hekaton, a hundred ; Icotulos, a cup). The metamor- 

 phosed reproductive arm of certain of the male Cuttle-fishes. In the 

 Argonaut the arm becomes detached, and was originally described as a 

 parasitic worm. 



HEL'MIN-THOID (Gr. helmins, an intestinal worm). "Worm-shaped, vermiform. 



HE-MEI/Y-TRA (Gr. hemi, half; elutrpn, a sheath). The wings of certain In- 

 sects, in which the apex of the wing is membranous, while the inner por- 

 tion is chitinous, and resembles the elytron of a beetle. 



HEM-I-MET-A-BOL'IO (Gr. hemi, half; metabole, change). Applied to those 

 insects which undergo an incomplete metamorphosis. 



HE-MIP'TE-RA (Gr. hemi; and pteron, wing). An order of insects in which 

 the anterior wings are sometimes " hemelytra." 



HER-MAPH'RO-DITE (Gr. Hermes, Mercury; Aphrodite, Venus). Possessing 

 the characters of both sexes combined. 



HET-E-RO-CER'CAL (Gr. heteros, diverse ; Icerkos, tail). Applied to the tail of 

 Fishes when it is unsymmetrical, or composed of two unequal lobes. 



HET-E-RO-GE'NE-ODS. 



HET-E-RO-GAN'GLI-ATE (Gr. heteros, diverse ; gagglion, a knot). Possessing a 

 nervous system in which the ganglia are scattered and unsymmetrical (as 

 in the Mollusca, for example). 



HET-E-RO-MOR'PHIC (Gr. heteros; morphe.form). Differing in form or shape. 



HET-E-ROPH'A-GI (Gr. heteros, other; phago, I eat). Applied to Birds the 

 young of which are born in a helpless condition, and require to be fed by 

 the parents for a longer or shorter period. 



HET-E-ROP'O-DA. 



HEX'A-POD (Gr. hexa, six ; pous, foot). Possessing six legs ; applied to the 

 Insecta. 



HI'LUM (Lat. hilum, a little thing). A small aperture (as in the gemmules of 

 sponges), or a small depression (as in Noctiluca). 



HIR-U-DIN'E-A (Lat. hirudo, a horse-leech). The order of Annelida com- 

 prising the Leeches. 



