150 BRITISH PARASITIC COPEPODA. 



like appendages which extend obliquely backwards 

 or at nearly right angles to the median line of the 

 body. Thoracic region forming a more or less elon- 

 gated and slender neck. Anterior portion of the 

 genito-abdominal region elongated and moderately 

 stout, and bearing near its distal end two tolerably long 

 egg-strings. The terminal or caudal portion of the 

 region more or less distinctly annulated and carrying 

 along its ventral surface numerous fascicles of bristle- 

 like and more or less branching appendages. 



Antennules short, small, setiferous. Antennas small, 

 uncinate. Mouth-aperture near the anterior end on 

 the ventral aspect. Thoracic legs four pairs, situated 

 close behind the head and with only a small interval 

 between each pair. The first and second pairs bi- 

 ramose, but the others one-branched ; the rami all 

 two-jointed, and all the thoracic limits small. 



In the immature Pe-uiu'lln the head is narrow and 

 subcylindrical, and the horns are usually wanting. 

 Both pairs of antennas though small are quite distinct, 

 the second pair are provided with strong terminal 

 claws and form effective grasping organs ; the second 

 maxillipeds are also stout and strongly clawed; a 

 considerable space intervenes between these append- 

 ages and the thoracic legs. 



"Male minute and not elongated " (Bassett- Smith). 



M. Edwards remarks that the male is very small, nearly 

 spherical, and possesses anteriorly a conical sucker, furnished 

 with a few styliform appendages ; and that on the inferior 

 aspect there are two pairs of very large subcheliform claws 

 by means of which it is enabled to hang on to the female.* 

 We have not seen the male. 



1. Pennella orthagorisci E. P. Wright. 

 (Plate LI, fig. 2.) 



1829-1843. Pennella filosa Guerin-Meneville. (55) p. 11, pi. ix, fig. 3. 

 1861. Pennella filosa Steenstrup & Liitken. (127) pi. xiv. fig. 31. 

 1870. Pennella'ortliayorisci E. P. Wright. (150) p. 42, pi. i, figs. 1-6. 



* ' Hist. Nat. Crust./ vol. iii, p. 522. See also G. M. Thomson, ' Trans. 

 New Zealand Institute/ vol. xxii, 1889, p. 368. 



