770 -T. H. ASflWORTH. 



veiitial lip ciliated, entire (i. e. not deeply notched as in tlie 

 ecaudate Aienicolida^). Gonads small, ova discoidal. 



(«) A. marina, Linn. — Nineteen cheetigerous segments. 

 Thirteen pairs of gills; the first, which is on the seventh 

 segment, may be reduced (or suppressed). Otocysts opening 

 to the exterior. Otoliths, numerous foreign bodies (quartz- 

 grains, etc.), which may, however, be covered with a layer 

 of secreted chitinoid substance, giving them a rounded out- 

 line. Six pairs of nephridia opening on segments 4 to 9. 

 One pair of oesophageal pouches, cylindrical, club-shaped, 

 or conical. Diaphragmatic pouches (on the first diaphragm) 

 small, globular, or flask-shaped. 



Found on both sides of the North Atlantic. 



{h) A. ass i mil is, Ehlers. — Twenty chastigerous segments. 

 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 segments 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. 



Kecorded from the extreme south of the American 

 continent. 



(f) A. assimilis, var. affinis, Ashworth. — Nineteen 

 cha)tigerous segments. Thirteen pairs of gills, the first 

 (liable to reduction or suppression) on the seventh segment. 

 Otocysts large, opening to the exterior. Otoliths numerous, 

 and composed either of foreign bodies (quartz-grains, etc.) 

 or of spherical chitinoid bodies. Other characters as in the 

 type of the species (see above). 



Recorded from Otago Harbour, New Zealand, the Mac- 

 quarie Islands, the Falkland Islands. 



{(l) A. claparedii, Levinsen. — Nineteen cluetigerous seg- 

 ments. Thirteen ])airs of gills, the first on the seventh 

 segment (this jiair of gills is liable to reduction or suppres- 

 sion, especially in specimens from the west coast of North 



