. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). TYPE CCELENTERA. Ill 4. Order Antipathariee. The members of this order are all colouial and secrete a brauehiug axial skeleton of a black horuy material. The polyps possess usually but six simple teutacles, and as a rule ouly six mesenteries are present, of which only the two lying in tlie transverse axis bear reproductive organs and mesen- terial lllaments ; in some forms four or six additional imper- fectly-developed mesenteries are present, but six seems to be the nu
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). TYPE CCELENTERA. Ill 4. Order Antipathariee. The members of this order are all colouial and secrete a brauehiug axial skeleton of a black horuy material. The polyps possess usually but six simple teutacles, and as a rule ouly six mesenteries are present, of which only the two lying in tlie transverse axis bear reproductive organs and mesen- terial lllaments ; in some forms four or six additional imper- fectly-developed mesenteries are present, but six seems to be the number typical for the group. 5. Order Erotactiniae. This order includes a group of forms, all simple and with simple tentacles, but showiug considerable variation in the number of the tentacles. They all agree in this particular, however, that there are twelve mesenteries arranged in pairs (Fig. 63, I-V1\ the two pairs attached to the si- phonoglyphe region of the stoma- todicum having their retractor muscles on the faces turned away from each other, while in the other four pairs they are on adjacent faces. The two former pairs are termed the divecave me^^n^me. F.^ea-DiAonAMMATrcTuANs- li^ ig. bd, J> and I) ), their constit- verse Section op Gonaciinia. uent mesenteries lying (me on each ^< ^ = directive mesenteries, side of the sagittal plane, and to- ^'^^ ^ ^^"^ Edwardsiun meseu- gether with one mesentery (//and i^ FA J*"""!' • * ,. .. 1 , ,, y ^ '^^ J^/= mesen let les forming /) from each of the other pairs pairs with//und/. represent the eight Edvvardsian "^ = secondjiiy pair of mes- mesenteries. To these six primary enteries. pairs ii varying number is added in the different forms; it may be, on each side, one between one of the pairs of direc- tives and the adjacent lateral pair (Scytophorm), or a pair in the same locality {Gonactinia, Fig. 63, 7), or two pairs (me of which corresponds to the pair of Gonactinia, the second pair lying betw
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1894
