. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 232 INVERTEBRATE MORPHOLOGY, i. Fig. 108.âDiaqkam of THK EXCKKTOUY Uk- I'HOUIICTIVK AND NeU- VtJUS iSVHTKMS OK Iliiudo (iftcr UoUHNK). â ce = ctMeldiil giiiijfliou. ep = ('|)i(ii(lyiuu9. f/l = oviiluciil gliiud. Ic = liiteral blood-vessel. n = iK'pliridiii. i)V = oviiry. pe = i)euis. te = testis. Macrobdella) it is thrown iuto three longitudinal muscular ridges whose edges may become converted iuto chitin, thus forming teeth. Salivary glands open into the pharynx in s
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 232 INVERTEBRATE MORPHOLOGY, i. Fig. 108.âDiaqkam of THK EXCKKTOUY Uk- I'HOUIICTIVK AND NeU- VtJUS iSVHTKMS OK Iliiudo (iftcr UoUHNK). â ce = ctMeldiil giiiijfliou. ep = ('|)i(ii(lyiuu9. f/l = oviiluciil gliiud. Ic = liiteral blood-vessel. n = iK'pliridiii. i)V = oviiry. pe = i)euis. te = testis. Macrobdella) it is thrown iuto three longitudinal muscular ridges whose edges may become converted iuto chitin, thus forming teeth. Salivary glands open into the pharynx in some forms. The large stomach into wliicii the pharynx opens behind gives off a number of lateral pouches (eleven pairs in Uirudo, seven in Clepsine), sometimes branched and increasing in size from before backwards, the most posterior pair being usually quite long and directed backwards parallel to the straight narrow intestine which opens to the exterior on the dorsal surface of the body, just anterior to the posterior sucker. Occasionally onl}' the poste- rior pair of pouches is present, and in a few forms they are entirely wanting. The nervous system (Fig. 108) is constructed on the ty])ical Annelid plan. It consists of a circunupsopha- geal ring and a ventral nerve-cord composed of fibres which have their origin in ganglion-cells grouped to- gether at definite intervals into gan- glionic masses. Several of these gan- glionic masses correspond to siuglo .segments, but at the anterior and posterior extremities a cousiderabh^ amount of fusion of the metameiic groups of ganglia has occurred. Tn Clepsine phina the jiortiou of the ner- vous system which lies above the ce80})hagus consists of a transverse band of fibres passing hiterally into the (iicunursophageal commissures aiit 1 <ti a 9 lurnuer oi gaiigiioniir masses. Six of these latter lie in front of the band of tibros. Please note that these images are extracted from scanned page images that may have been digitally
Size: 840px × 2975px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1896
