. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). s caual 36. It i large of dif. iu pifr. iieuts, euous reseut CJC ITV (IF. TYPE C(ELENTERA. 73 Nerve-cells have also been described, though a definite nervous systen. cannot be said to exist. ElongaLl re'rcf le processes have been observed projecting from the sur^acl of certan. sponges ana at the base of each is a group of st Lte liepio ess lo these cells a nervous function has been at tn juted and the processes have been considered senTory -Ih the exception of these s
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). s caual 36. It i large of dif. iu pifr. iieuts, euous reseut CJC ITV (IF. TYPE C(ELENTERA. 73 Nerve-cells have also been described, though a definite nervous systen. cannot be said to exist. ElongaLl re'rcf le processes have been observed projecting from the sur^acl of certan. sponges ana at the base of each is a group of st Lte liepio ess lo these cells a nervous function has been at tn juted and the processes have been considered senTory -Ih the exception of these structures, however, no sense' organs or nerve-elements have been yet observed. llie Sponges may be arranged according to the nature of then- skeleton, in four orders. ^auire ot 1. Order Calcarea. In the Calcarea the skeleton is always r>rP««nf i ⢠formed of spicules consisting of carbonil'oTte Th: group contains forms of various comnlpvi-fv^^ / \ , U. simple cylindrical /. J:!^tl^tn ^l;;::;.^^ Ascoatype through Sycon forms such as OmntiauZ sentutives of the third and fourth types. Imleed ft i o '"" this group that the Ascon and Svcon tvnesof .h 7 ^ found AH flm ⢠^â¢>^"" t.^ pes ot structure are sLViudeptL 'â " "''"'" "" '""""^ "â "> '-â « "' only 2. Order Cornacuspongise. { The skeleton of the Cornacuspougiro consisf., «,-fl <⢠; sihceous, shallow M-ater and are n,' T ^'"â¢'' '''^ 1-HlH upon the entire absence J H^^'^^^^^^^^ ^^'â ^vi'ioh is found in the shallo 4t s I ?'""^'"' '"^^ of the MeditGrran« , t^ p "f " ^ ""'*"'" I"*'^'"" ^Bi ^^^". 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 wo
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1896
