22 



AMERICAN HYDROIDS. 



THE MORPHOLOGY OF THE SAROOSTYLES. 



Figs. 75-81. After ('. Hereko-wsky. Figs. 82-85. After R. von Lemlent'Hd. 



Fig. 75. Sarcoatyle of Plitniularia sp. in longitudinal section, cct, ectoderm; in, endoderin. 

 Fig. 76. The same greally expanded, d, eudoderm ; ect t ectoderm ; p, perisarc. 

 Fig. 77. Portion of same, showing ectodermal cells embedded in free protoplasm. 



Fig. 78. Young hydranth of Aglaophenia iu longitudinal wet ion. /, spare formed by a fission in the ectoderm. 

 Fig. 79. The same in a later stage of development. /, apace formed by fusion of ectoderm. ;;, budding nematophore. 

 Fig. 80. The same with nematophorea Cully developed, a, bridge of ectoderm uniting tht- hydranth and Mnrensl yl<- ; b, supracalycine nemafo- 



phore; c, mesial nematophore; d, ectoderm entering base of nematophon- ; /, the fissure whirh Commenced as represented in figure 78; 



o, opening nf meai:il nematophorc, 

 Fig. 81. Hydrotheca containing the hydranth which is degenerating into a sarcostyle. rf, endoderin ; e and A-, protoplasm ir j>rocesses; p, 



periaarc. 



Fig. 82. Nematophore and sarcostylc nf J'hnnvlaria sp. < nt, i-ndmlerm ; (/, ganglion cells; in and in', mnsch- strhr ; 'it. iii i m:ittcy.sts. 

 Fig. 83. Sarcostyleaof Aylaophrnia sp. capturing a Xoea. b, neroatocyst-bearing process, and c, adhesive process, "I 1 sun ustyle. 

 Fig. H4. Portion of end of " :idln-si\ polyp," highly magnified. I; adhesive globuh's; si, sense orgmi. 

 Fig. 85. "Adhesive polyp;" cut, endoderm; k, knob at mid rnntjiining adhesive globules. 



