4 6 



MORPHOLOGY OF INVERTEBRATE TYPES 



EL. 



sp... 



(L. 



spgcL 

 mclc.... 



d.p._ 



FIG. 9. Morphologic type of a Hexactinia after Y. Delage & E. 

 Herouard, Zoologie Concrete, acn, acontia; b, mouth; d I, primary mesen- 

 tery; d II, secondary mesentery; d III, tertiary mesentery; eld, cinclides; 

 ctd, dorsal (directive) mesentery; dp, foot; dtt, capitulum; entd, mesenteric 

 filament; gtx, gonad; ilg and Ig, subdivisions of an endocoele; mclc, meso- 

 gloea; o, outer septostoma; oi, inner septostoma; p, tentacular pore; ph, 

 gullet; sph, sphincter capituli; spgd, dorsal siphonoglyphe; spgv, ventral 

 sophonoglyphe; tt I, IV, tentacles of the first to fourth verticel. 



