. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 314 IN VERTEBRA TE MORPIIO LOOT. animals are propelled through the water. In their general form much diversity is observable. In accordance with their pelagic habits the majority are more or less transparent; and some, the Gymnosomata, l*neumoderma, Clione, etc., are entirely destitute of a shell, mantle, and, except in Pmumo- derma and its allies, of a branchia. Others, the IViecosomata, possess these structures, however—the shell in Li7nacina beiug spirally coile
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 314 IN VERTEBRA TE MORPIIO LOOT. animals are propelled through the water. In their general form much diversity is observable. In accordance with their pelagic habits the majority are more or less transparent; and some, the Gymnosomata, l*neumoderma, Clione, etc., are entirely destitute of a shell, mantle, and, except in Pmumo- derma and its allies, of a branchia. Others, the IViecosomata, possess these structures, however—the shell in Li7nacina beiug spirally coiled, the mantle-cavity situated in front of the. Fio. iiO.—lIyalea complnnata (after Gkcbnbaur, from Hertwig). rt = anus. m = nmntle. br = bituicbisB. oe = a'Hopljiigus. c = heart. re = lu-phridiii. O = reproductive orgaus. v = stomiu'h. h = digestive gland. // = pedal ganglion. visceral hump beiug without a branchia; in Sfyliohi the shell is not coiled, but is cone-shaped and bilaterally symmetrical, the mantle-cavity containing a gill ; while in ('! the original shell is replaced by a cartilaginous case formed by the subepidermal tissues of the mantle, and the voluminous mantle-cavity contains no gill. The head of the Gymnoso- muta carries a non-retractile jiroboscis, at the extremity of which is Hituated the nioutl!-, and. it iiuiv furthermore bear in addition to the tentacles usually present peculiar tentacle- like processes, sometimes provided with suckers and perhaps. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McMurrich, J. Playfair (James Playfair), 1859-1939. New York : H. Holt
Size: 1414px × 1766px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1896
