. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MOUTHPARTS OF LARVAL LOBSTERS 393 and the scaphognathite constitute the second maxilla (Fig. 5). In the fourth stage the medial edge of the distal and proximal lobes of the basal endite bears mostly simple (I) and several serrulate (Fl) setae, with one or two pappose (Bl) setae at its distal end. The distal and proximal lobes of the coxal endite are armed with pappose (Bl), plumodenticulate (C4), serrulate (Fl), and simple (I) setae. The one-segmented endopodite is only sparsely set with setae. Three type C2 plumodenticulate
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MOUTHPARTS OF LARVAL LOBSTERS 393 and the scaphognathite constitute the second maxilla (Fig. 5). In the fourth stage the medial edge of the distal and proximal lobes of the basal endite bears mostly simple (I) and several serrulate (Fl) setae, with one or two pappose (Bl) setae at its distal end. The distal and proximal lobes of the coxal endite are armed with pappose (Bl), plumodenticulate (C4), serrulate (Fl), and simple (I) setae. The one-segmented endopodite is only sparsely set with setae. Three type C2 plumodenticulate setae are borne on its tip, three pappose (Bl) setae occur medially, and several plumose (A) setae are found laterally. The scaphognathite is a long, flat structure formed by a fusion of the endo- podite (anterior lobe) and epipodite (posterior lobe). It serves to pump water through the gill chamber and is aided in this function by a complete fringe of closely set plumose (A) setae. Although the second maxilla follows the general pattern of increase in size and number of setae, it appears to undergo less drastic changes than the other mouth- parts. This may be linked to the necessity for a well developed scaphognathite (for respiratory purposes) from the beginning of the lobster's free-swimming existence—the first stage. The endopodite of the first stage bears pappose (Bl) setae in contrast to the types found here in the fourth-stage lobster. Bl. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
