. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. IMMATURE SPECIMENS OF PENELLA FILOSA. 301 accessory branches and so further approached the complexly- parted appendages of the adult. The dimensions of " E" were; head 3 mm., thorax 150 mm., abdomen 9 mm. The head was 2 mm. wide and the horns spread 3.5 mm. The total length of " F " was 133 mm. Although fundamentally similar, in several points the develop- ment shown by this series differs from the only previous descrip- tion of undoubted Pendla larvae which I have been able to find, that recorded for P.

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. IMMATURE SPECIMENS OF PENELLA FILOSA. 301 accessory branches and so further approached the complexly- parted appendages of the adult. The dimensions of " E" were; head 3 mm., thorax 150 mm., abdomen 9 mm. The head was 2 mm. wide and the horns spread 3.5 mm. The total length of " F " was 133 mm. Although fundamentally similar, in several points the develop- ment shown by this series differs from the only previous descrip- tion of undoubted Pendla larvae which I have been able to find, that recorded for P. varians by Steenstrup and Liitken ('61). This earlier account starts with a larva (Fig. 5) unquestionably much more immature than the youngest form in my series.. 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 work.. 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