. Elementary text-book of zoology. HIRUDO. 193 Fig. 120.—Transverse Section through the Leech {Hiruiio medicinalis). (Mainly after Bourne.). Crop cut in three places. Botryoidal Tissut Dorsal Sinus. Dorso- ventral Bladder of Nephri- dium. Testis Lobe of Nephridium. Ventral Testis. Sinus. Nephridium. Vas Deferens. Testicular Coelom, OF A Leech. (After WlilTMAN.) On the last annulus of each segment, from segment 6 to 22 inclusive, there open on the ventro-lateral line paired nephridiopores. On the first five segments one Fig. 121.—Dorsal View of the sense-organs on each side OF the Ante
. Elementary text-book of zoology. HIRUDO. 193 Fig. 120.—Transverse Section through the Leech {Hiruiio medicinalis). (Mainly after Bourne.). Crop cut in three places. Botryoidal Tissut Dorsal Sinus. Dorso- ventral Bladder of Nephri- dium. Testis Lobe of Nephridium. Ventral Testis. Sinus. Nephridium. Vas Deferens. Testicular Coelom, OF A Leech. (After WlilTMAN.) On the last annulus of each segment, from segment 6 to 22 inclusive, there open on the ventro-lateral line paired nephridiopores. On the first five segments one Fig. 121.—Dorsal View of the sense-organs on each side OF the Anterior End ig enlarged into an eye; thus " there are five pairs of eyes. In the median ventral Integumentary. ,. ^, . , line the unpaired male genital aperture is found in segment 10 and the female in segment 11. The body is flexible and is enveloped in a thin cuticle secreted by the simple ectoderm. The mouth leads into a sucking pharynx, the walls of which contain unicellular salivary glands and can The small dots are the sense- AHmPtltarv ^^ pulled OUt by organs, of which five pairs are Aiuneniary. ^jfj mUScks. large and formed into eyes. & "^ ^"• A short (esophagus connects it with the crop. This is a thin-walled but spacious sac which M. • 14. 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 Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1902
