. Bulletin - United States National Museum. Science. Figs. 758-764.—7ri8. Disk of PsNTAMETROCaiNOS vaeians. 759. Disk of Thaumato.\ietba bobealis. 760. Ventral tikw of foktion of pinnule of Pekissometra .selbne. showing co\-ering plates closed down over ambulacral groove. 761. Lateral view of portion of dried pinnule of Neo- MBTBA SPINOSISSIMA, SHOWING COVERING PLATES CLOSED DOWN OVER AMBULACBAL GBOO\-B. 762. TOB OP GBODSE (BONASA UMBBLLATA), SHOWING SCUTES DEVELOPED IN WINTER WHICH AUK SIMILAB TO COVERING PLATES (DRAWING BT AUTHOE). 763. VENTRAL VIEW OF PORTION OF DRIED PINNULE OF COMATILIA I
. Bulletin - United States National Museum. Science. Figs. 758-764.—7ri8. Disk of PsNTAMETROCaiNOS vaeians. 759. Disk of Thaumato.\ietba bobealis. 760. Ventral tikw of foktion of pinnule of Pekissometra .selbne. showing co\-ering plates closed down over ambulacral groove. 761. Lateral view of portion of dried pinnule of Neo- MBTBA SPINOSISSIMA, SHOWING COVERING PLATES CLOSED DOWN OVER AMBULACBAL GBOO\-B. 762. TOB OP GBODSE (BONASA UMBBLLATA), SHOWING SCUTES DEVELOPED IN WINTER WHICH AUK SIMILAB TO COVERING PLATES (DRAWING BT AUTHOE). 763. VENTRAL VIEW OF PORTION OF DRIED PINNULE OF COMATILIA IRIDOMETEIFORMIS, SHOWING COVERING PLATES (DRAWING BT AUTHOE). 764. LATERAL VIEW OF DRIED PINNULE OF COMATILIA lEIDOMETRIFORUIS, SHOWING COVERING PLATES (DRAWING BT AUTHOE). In describing the formation of a sacculus Keichensperger says that a limited number of mesenchyme cells assemble, usually forming a small spherical cell mass. These cells possess a circular nucleus with prominent nuclear bodies. The small. 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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