SEA-FISHERIES LABORATORY. 281 



merits 4 to 9. One pair of oesophageal pouches, cylin- 

 drical, club-shaped or conical. Diaphragmatic pouches 

 (on the first diaphragm) small, globular or flask-shaped. 



Found on both sides of the Atlantic north of 40° IN". 

 latitude. 



(b) A. assimilis, Ehlers.* Twenty chsetigerous seg- 

 ments. Thirteen pairs of gills, the first of which is 

 situated on the eighth segment (the first gill is liable to 

 be reduced or suppressed). Otocysts large, opening to the 

 exterior. Otoliths numerous, spherical or rounded 

 chitinoid bodies. Six pairs of nephridia opening on seg- 

 ments 4 to 9. Several pairs of oesophageal pouches; the 

 anterior pair long, club-shaped or filiform, the others 

 much smaller and pear-shaped. No pouches on the first 

 diaphragm. 



Eecorded from the extreme south of the American 

 continent. 



(c) A. assimilis, var. affinis, Ashworth.* Nineteen 

 chaetigerous segments. Thirteen pairs of gills, the first 

 (liable to reduction or suppression) on the seventh seg- 

 ment. Otocysts large, opening to the exterior. Otoliths 

 numerous, and composed either of foreign bodies (quartz 

 grains, &c), or of spherical chitinoid bodies. Other 

 characters as in the type of the species (see above). 



Eecorded from Otago Harbour, New Zealand, the 

 Macquarie Islands, the Falkland Islands. 



(d) A. claparedii, Levinsen.f Nineteen chastigerous 

 segments. Thirteen pairs of gills, the first on the seventh 

 segment (this pair of gills is liable to reduction or sup- 

 pression especially in specimens from the west coast of 

 North America). Lateral lobes of prostomium well 



* For an account of these forms see Ashworth, J. H. — Q.J.M S 

 Vol. 46, pp. 737-785. Pis. 36-37. 



t For an account of this species see Gamble, F. W. and 

 Ashworth, J. if.— Q.J. M.S., Vol. 43, pp. 419-569. Pis. 22-29. 



