. The Cambridge natural history. Zoology; Zoologia Geral. A B FIG. 104.—Diagram of (A) eurypylous and (B) apliodal canal systems, a, Apopyle ; a', apliodus ; E, excurrent caual ; 1, incurrent canal ; p, prosopyle ; p', short pro- sodus. (After Sollas.) changes involved go hand in hand with increasing bulk of the dermal layer. A glance at the accompanying figures will show at once the connexion between the phenomena. The increase in the dermal layer (1) greatly reduces the extent of the lumen of the excurrent canals ; and (2) results in the intervention of a narrow tube or aphodus between the m
. The Cambridge natural history. Zoology; Zoologia Geral. A B FIG. 104.—Diagram of (A) eurypylous and (B) apliodal canal systems, a, Apopyle ; a', apliodus ; E, excurrent caual ; 1, incurrent canal ; p, prosopyle ; p', short pro- sodus. (After Sollas.) changes involved go hand in hand with increasing bulk of the dermal layer. A glance at the accompanying figures will show at once the connexion between the phenomena. The increase in the dermal layer (1) greatly reduces the extent of the lumen of the excurrent canals ; and (2) results in the intervention of a narrow tube or aphodus between the mouth of each chamber and the excurrent canal. The chamber system is then converted from an " eurypylous " to an " aphodal " type. When the incurreut canal also opens into the chamber by way of narrow tubes, one proper to each chamber and termed " prosodus," the canal system is of the " diplodal " type. Cortex.—All the stages in the formation of a cortex are to be seen among the adult members of the group. Certain species ( Plakina monolopha, ) are destitute even of an ectosome,. 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 Harmer, S. F. (Sidney Frederic), Sir, 1862-; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. [London, Macmillan and co. , limited; New York, The Macmillan company
Size: 1576px × 1586px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1906
