SPHYRION LUMPI. 165 



equal to a quarter of the entire length of the animal, 

 somewhat cordiform or crescent-shaped, and consisting 

 of two lateral projections directed slightly forward 

 and expanded into rounded wing-like processes one 

 on each side of the small cephalon or head. A neck, 

 tolerably elongated, slender and cylindrical, joining 

 the genital segment to the anterior end of the body. 

 Genital segment of moderate size, broadly ovate or 

 obscurely heart-shaped and slightly flattened ; the 

 width, which is nearly the same as, or which slightly 

 exceeds, the length, equal to fully one and a half times 

 the width of the cephalothorax ; its lateral margins 

 boldly rounded and the posterior margin nearly 

 straight; a small median lobe on the posterior margin 

 representing the terminal part of the abdomen, and 

 on either side of it a tolerably large cluster of vesicles 

 resembling a bunch of grapes, each cluster fully half 

 the size of the genital segment. Egg-strings straight 

 and moderately elongated. Length of the animal ex- 

 clusive of the egg-strings about 40 mm. 



The following measurements are taken from a 

 fairly perfect specimen : Length of head, 6 mm. ; 

 of neck, 15'5 mm. ; of genital segment, about 12 mm. ; 

 appendages of genital segment, 7'5 mm. 



Antemmles small and feeble. Thoracic limbs appa- 

 rently obsolete, mouth-organs rudimentary. 



The male has not been observed. 



Habitat. An imperfect specimen was taken from a 

 lumpsucker (Ci/elopterus lumpus) captured in the nets 

 of the salmon fishers at the Bay of Nigg near Aberdeen 

 in April, 1900; and a fine, nearly perfect specimen 

 was presented to one of the authors by Mr. Irvine of 

 Aberdeen who obtained it on one of a number of cat- 

 fishes (Anarrhicha* l>tjis} landed at the Aberdeen Fish- 

 Market but captured in the North Sea, probably out- 

 side the Scottish area, by a Norwegian Trawler. It 

 is from this specimen that the description given above 

 was prepared. The Bay of Nigg specimen was minus rho 

 head, probably owing to the fish having been roughly 



