. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 16 VINCENT G. DETHIER 4. Two large cones (sensilla basiconica) located to either side of the headpiece. 5. Two small rather inconspicuous cones (sensilla basiconica) lo- cated near the base of the headpiece. 6. A pore plate (sensillum placodeum) situated almost at the basal extremity of the terminal segment. I n some species examined the three large sensilla basiconica were. FIG. 3. Maxilla of a P. quinqiicmaculata larva. h, hair; st, sensillum styloconicum; hp, headpiece; p, pore (sensillum plat-odeum); sh, sensilla basi- c
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 16 VINCENT G. DETHIER 4. Two large cones (sensilla basiconica) located to either side of the headpiece. 5. Two small rather inconspicuous cones (sensilla basiconica) lo- cated near the base of the headpiece. 6. A pore plate (sensillum placodeum) situated almost at the basal extremity of the terminal segment. I n some species examined the three large sensilla basiconica were. FIG. 3. Maxilla of a P. quinqiicmaculata larva. h, hair; st, sensillum styloconicum; hp, headpiece; p, pore (sensillum plat-odeum); sh, sensilla basi- conica; Mp, maxillary palpus; St, stipes; I, II, III, segments one, two, and three of the maxillary palpus. found to be characteristically sculptured (cf. Fig. 2). One type ap- pears as spiral ridges on the outside of the cone while the other type exists as internal ridges running from top to bottom and connected by fine cross striations. The purpose of these ridges and striations is not known, nor have they ever been reported in the literature. Character- istic of all these organs (hairs excepted) is the fact that they arc hollow and their walls except at the bases are less than one micron in 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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