234 ON A LAllOE PENELLA-STECIES. 



The region of tbe body succeeding tbe bead, tbe so- 

 called neck, that for its greater part is bidden within 

 tbe flesh of tbe fish, is unsegraented, smooth; the surface 

 ol tbe genital segment however is wrinkled and furnished 

 with faint annular grooves and small tubercles. In P.Jilosa, 

 found upon Xiphias gladiiis, these wrinkles appear to be 

 extraordinarily developed, according to tbe figures of Boc- 

 cone ') and Guerin ^). 



Behind the genital apertures the abdomen is fringed on 

 both sides with a row of twenty-one pale violet tufts of 

 filaments, the last of which extend beyond the extremity 

 of tbe body. Those abdominal tufts consist of more than 

 25 filaments of different length, and much agree with 

 those of P. /ilosa and crassicornis, figured by Steenstrup 

 and Liitken. Among these large filament-tufts we find 

 on several places a smaller thread, that is single or only 

 bifurcated; also in front of the genital apertures some 

 small unbranched filaments are to be found. In P. sagitta, 

 e.vocoeti and varians all the abdominal filaments appear 

 to be entirely unbranched or only bifurcated. Dorsally, on 

 a short distance from tbe bases of tbe abdominal tufts, 

 there is a row of irregularly-shaped tubercles, ordinarily 

 placed in couples next to each other. 



There are two long egg-strings, exceeding the body in 

 length. 



Leydeu Museum, January 1906. 



1) Recherches et ohservations naturelles, 1674, pi. 287, fig. UA. 



2) Iconographie du Kègne animal de Cuvier, 1829 — 44. Zoophytes, pi. IX, 

 fig 3. 



Notes from the Leyclen ]Museuiu, Vol. XXVI. 



