GLOSSARY OF TECHNICAL TERMS. 869 



Funiculus. Lat. funiculus, a little cord. A term here applied to the slender thread- 

 like filament which connects the component nuclear masses in such infusorial types 

 as Loxodes and Loxophyllutn. 



Gastrce.\ or Gastrula. Dim. Or. gaster, a belly. That stage of the embryo in 

 various animals in which it consists of two fundamental cellular membranes, ectoderm 

 and endoderm, enclosing a central cavity. 



Gastrozooids. Gr.^(7j/fr, the belly ; 20011, ■s.-aawA. Title proposed by H. N. Mosely 

 for the distinction of the ordinary alimentative or mouth-bearing zooids of Millepora, 

 Siylaster, and other coral-building Hydrozoa. 



Gibbous. Lat. gibbus, hunchbacked. Unsymmetrically distended or swollen at some part 



of the surface. 

 Glabrous. Lat. glaber, smooth. Having a smooth surface. 



GuBERNACULUM. l.zX.. gubemacu him, 3i helm or rudder. A title utilized by H. James- 

 Clark for the distinction of the trailing flagellum, having an apparent guiding function, 

 developed in such infusorial forms as Anisonema and Heteromita. 



Helicoidal. Gr. helix, a spiral ; eidos, resemblance. Having a twisted or spiral 

 contour, like a snail-shell. 



Heterogexeous. Gr. heteros, different ; genos, kind. Having a mixed or compound 

 constitution, the converse of Homogeneous. 



Heterogeny. Gr. heteros, different ; genos, birth. The doctrine maintaining that 

 living organisms are produced out of inorganic matter ; identical with Abiogenesis. 



Heterotrichous. Gr. heteros, different; M/-/.r, hair. Having hair or cilia of diverse 

 character. 



Histology. Gr. histos, a web or tissue ; logos, discourse. The study of the more 

 minute or cellular elements of organic structures. 



Holotrichous. Gr. holos, whole; thrix, hair. Having hair or cilia of a uniform 

 character developed over the entire surface. 



Homogeneous. Gr. homos, same ; genos, kind. Having a simple or uniform constitution, 

 in contradistinction to Heterogeneous. 



Homologous. Gr. homos, same ; logos, expression. Having the same morphologic or 

 structural value, though possibly differing in form and function, as the arm of a man 

 and the wing of a bird. 



Homoplastic. Gr. homos, same ; plastikos, moulded or formed. Having a similar 

 or corresponding form. 



HoMOPLASTS. Gr. homos, same ; plastikos, what has been formed. Objects corresponding 

 in external form though of a distinct nature. 



Hypoblast. Gr. hupo, under ; blastos, germ. The internal gemiinal layer of the 

 Metazoic embrj'o, equivalent to the Endoderm. 



Hypotrichous. Gr. hupo, under ; thrix, hair. Having hair or cilia developed only on 

 the under surface. 



Illoricate. Lat. z/for in, not, without; lorica, coat of mail. Devoid of a protective 

 sheath or lorica. 



Indurated. Lat. induratus, hardened. Having a hardened consistence. 



INFUNDIBULIFORM. Lat. infundibulum, a funnel ; /tirw^, shape. Funnel-shaped. 



Interstitial. Lat. inter, between ; sisto, I stand. Relating to intervening parts or 

 spaces. 



ISOJiORPHlc. Gr. isos, equal ; morphe, shape. Exhibiting an equal or corresponding 

 contour. 



