GLOSSOLOGY. xv 



Hydrorhiza {iSpa, hydra; f,tta, root). The proximal end of the hydrophyton by which the 

 colony fixes itself to other bodies. (Diagrams I and II, 6, b, b, b.) 



Hydrocaulus (uSpa, hydra; kouXo'c, stem). All that portion of the hydrophyton which 

 intervenes between the hydrorhiza and the hydranth. (Diagrams I and II, a, a, a, a.) 



Coenosarc [kowoq, common ; aap^, flesh). The common organized fleshy portion of the 

 hydrophyton ; the living bond by which the zooids are organically united to one another. 

 (Diagrams I and II, d, d, d, e, e, e.) 



Nematophores (i-n/ua, thread; fopiut, I carry). Peculiar bodies developed in certain genera 

 from definite points of the trophosome (and of the corbulse in the genus Aglaophenid), and con- 

 sisting of a chitinous receptacle with sarcode contents in which thread-cells are usually immersed. 

 They are characteristic of the family of the Plumularidce. (Figs. 50 and 51, pages 116 and 117.) 



TERMS APPLICABLE TO THE GONOSOME. 



Gonophore (ydi'oc, offspring; ^opku),\ bear). The ultimate generative zooid which gives 

 origin directly to the generative elements, ova or spermatozoa. (Diagrams I, l\ k', I, and II, k.) 



Sporosac {a-Kopa, sexual product, offspring; auKiiQ, a sack). A sack-shaped gonophore 

 destitute of obvious umbrella. (Diagrams I, k, k', and II, k.) 



Planoblast [wXavoQ, wandering ; jSXoimj, a bud). A generative bud with a structure fitting 

 it for a free locomotive life when detached from the hydrosome. (Diagrams I and II, I.) 



Gonocheme (yoVoe, offspring; oy^nun, chariot). A medusiform planoblast which gives origin 

 directly to the generative elements. (Diagram I, /.) 



Blastocheme (/3Xa<7Tj(, bud ; oy^vf^a, chariot). A medusiform planoblast which gives origin 

 to the generative elements, not directly, but through the medium of special sexual buds which 

 are developed from it. (Diagram II, I, and Figs. 9 and 10, page 35.) 



Blastostyle (jSXaiTTi), bud; arvXag, column). A columniform zooid destined to give origin to 

 generative buds. (Diagrams I and II, m, m, in.) 



Perigonium [inpi, around; -yococ, offspring). The walls of a sporosac by which the genera- 

 tive elements are confined, and in which, when fully developed, three laminae may be demonstrated. 

 (Fig. 7, page 32.) 



Ectotheca (f'/cro'c, outside; 0>iK»), sheath). The most external of the three laminae of the 

 perigonium. (Fig. 7, c, page 32.) 



Mesotheca [^liaoq, middle; 0»(k»), sheath). The middle one of the three lamina; of the 

 perigonium. (Fig. 15b, b, page 44.) 



Endotheca (t'l/Soi^, within; Qw, sheath). The most internal of the three laminae of the 

 perigonium. (Fig. 7, b, page 32.) 



Spadix ((TTraSit, the fruit-shoot of a palm tree, a term used by botanists for a form of inflo- 

 rescence). The hollow body which projects from the floor of the sporosac into its cavity, and round 

 which the generative elements are developed. (Diagrams I and II, k, k', and Fig. 7, a, page 32.) 



Umbrella. The gelatinous bell of a medusiform planoblast. (Diagrams I and II, /, and 

 Fig. 8, c, page 33.) 



