90 REPORT OF NEW JERSEY STATE MUSEUM. 



there by the variously developed processes springing from the 

 back portion of the head. 



Key to the species. 



a. Head carries posteriorly two short obtuse horns ; abdominal appendages 

 slender and united as clusters at base. Hlosa 



aa. Head carries posteriorly two very long branchiform appendages; ab- 

 dominal appendages simple. sagitta 



Pennella filosa (Linnaeus). 



Plate 22. 



PennaUda filosa Linnaeus, Syst. Nat.,, Ed. 10, 1758, p. 819. Mediterranean Sea 



(on Xiphias gladius). 

 Pennella filosa Leidy, Proc. Acad. Nat. Sci. Phila., 1890, p. 281. Beach Haven, 



New Jersey (on Mola mola). 

 Penclla plumosa De Kay, N. Y. Fauna, Crust. VI, 1844, p. 60, New York. 



Description. — Head rather large, globular, or compressed 

 spheroid, lower anterior surface thickly papillate, and dorsally 

 with a median and lateral pair of obtuse, robust horn-like pro- 

 cesses, which median not more than half length of others. 

 These processes all posterior on upper surface of head, median 

 directed backward and lateral outwards. Tubercles near buccal 

 aperture small, these representing foot-jaws. Several tubercles 

 at lateral lower anterior faces of head. Neck long, mostly 

 straight, slender, without distinct segments, and in same line 

 with thorax. On neck ventrally, just below head, four pairs of 

 minute hooks, these rudimentary, so that no distinct segmenta- 

 tion is evident. Thorax thicker, cylindrical, segmented or an- 

 nulated, and about equal or a little shorter than neck. Abdomen 

 short, about two-fifths length of thorax, also narrower than 

 thorax, annulated and with crowded lateral filaments issuing 

 from base in regular bunches on each side. Filaments moderate 

 in length, though somewhat variable, and last ones extend down- 

 ward and back beyond end of abdomen their length, which equal 

 to that of any others. Ovaries long, slender, filiform. Color 

 brownish, head and neck paler. Filaments and ovaries pale. In 

 life thorax, abdomen and appendages black, and head, neck and 



