376 s. HATTA : 



of gill-slits. This Anlage gives rise to a much coiled gland, which 

 opens into tlie body-cavity, at first through only one ciliated 

 funnel, but afterwards tlirongh four. The gland passes over 

 posteriorly to a pair of ducts, which run along the chorda on 

 either side and open into the cloaca. INUtller has homologised 

 the structure with the "■' V ornière " of jlfjjxinc and called the 

 duct " Urnierengang " (pp. 121-122). He found a pair of glo- 

 meruli projected on the median surface of the gland and lined 

 with the peritoneal epithelium. 



Max Furbringer ('78) studied the larva3 of Ammococles 

 planen', which varied from 4.5 to 180 mm. in length. His state- 

 ments essentially confirm Muller's. In his account we find the 

 following sentences : '' Die auf allen Präparaten ausgebildete 

 Vomiere, die ich im Wesentlichen ganz wie ]\1Üller fand, bildet 

 einen nahmentlich bei den mittleren Stadien voluminösen und 

 durch 4-5 Myokommata erstreckten Complex von Windungen, 

 die vorn durch mehreren Peritonealcanäle (Wimpertrichter) in 

 Bauchhöhle münden nnd hinten in den Vornierengang übergehen. 

 Diese auf die 2-3 ersten Myokommata beschränkten Trichter 

 ragen in unregelmässiger Folge bald ventral-medial, bald ventral- 

 lateral in die Bauchhöhle vor und wurden (von Carlberla 

 und mir) meist zu fünf gefunden. Die von rundliche Epithel- 

 zellen bekleidete Glomerulus verhielt ganz wie Mïjller beschreibt" 

 (p. 42).. 



The larvse of Ämmocoetcs in cjuestion seems to correspond 

 probably to Stage v, or later stages of ray list ; in such a stage, 

 I could not find more than three (or rarely four) pairs of the 

 tubules, or of the nephrostomes.^^ 



1) See the foot-note on p. 358. 



