117 
Gen. Pennella, Oken. 
1815. Pennella, Oken, Lehrbuch der Naturgeschichte, Dritter 
Theil. Zoologie, p. 357. 
1822. Lerneopenna, de Blainville, Principes d’Anatomie com- 
parée, Vol. I., Tab. 7. 
1830. Pennella, Cuvier, Régne Animal, Vol. III., p. 256. 
1832. Pennella, von. Nordmann, Mikrograph. Beitrage, zweites 
Heft; pp: 52; 121. 
1840. Penellus, Milne-Edwards, Hist. Nat. Crust., Vol. III., 
p:. 522 (Penela, p. 1632): 
m853. Penella, Dana; U:S Expl. Exp;, Vol. -X1IT., p:.1448. 
1860. Baculus, Lubbock, Trans. Linn. Soc. London, Vol. 
MAL PE pieQo: 
1861. Pennella, Steenstrup and Liitken, K. Danske Vid. 
Selsk. Skr.> Set. 5, Vol. V.,. p: 408. 
1864. Pennella, von Nordmann, Bull. Soc. Imp. Moscou, 
Vol. XW p.485. 
1865. Pennella, Heller, Reise der Novara, Crustaceen, p. 244. 
1876. Pennella, Richiardi, Atti. Soc. Toscana, Vol. II., p. 190, 
Vol ILL... pags: 
1883. Hessella, Brady, Challenger Copepoda, Reports, Vol. 
Vile op. 136. 
1889. Penella, Thomson, Trans. New Zealand Inst., Vol. 
XIE. ps 3608: 
1895. Pennella, Mrazek, Sitzungsber. Bohmisch. Gesellsch., 
Art. 44, 1895. 
1899. Penella, Bassett-Smith, Proc. Zool. Soc. London, p. 482. 
Oken gave the following definition :—‘ Pennella; Leib 
walzig, hinten gefiedert nebst zwei langen Eierschniiren, 
Kopf kolbig, abgestutzt, mit zwei knorpeligen, graden Hornern 
nach hinten.” With this may be compared the definition 
supplied by Mr. Bassett-Smith :—“‘ Head large, globose, 
tuberculate, with arm-like projections directed backwards ; 
the neck is long and straight, not distinctly segmented, united 
with the elongated genital segment in the same line. Abdomen 
penniform. Four pairs of limbs are present, placed close 
behind the head and together; the first two are biramose, 
the third and fourth uniramose, each branch with two joints. 
Male minute, not elongated.” 
The feathered termination of the body sufficiently explains 
the generic name, and makes the variation in spelling less easy 
to account for. 
In P. crassicornis, Steenstrup and Liitken, and in P. histio- 
phort, Thomson, the arm-like processes behind the head are 
B 649. H 
