AMPHINOMIDAE 



differences appear to be as follows : A'^. megalops is a much smaller form than A'^. crinita, 

 measuring only 10-15 mm. in length and having 17-19 chaetigers, whereas A^. crinita 

 is recorded with a length of over 40 mm. and with 28 segments. In A'^. megalops the 

 eyes are larger than in A^. crinita, the gills are much smaller and begin further back on 

 the body. Moreover, the anus opens on the last segment and not further forward as 

 in A", crinita. This position of the anus is characteristic of young examples of Notopygos, 

 and has no specific differential value, but it strengthens the presumption that in 

 N. megalops we are dealing with a young form. 



Genus Amphinome, Bruguieres 



Amphinome vagans (Savigny). 



For synonymy see Chamberlin, 1919, p. 27. 

 29. X. 25. 11° 12' N, 18° 30' W. Found on floating cuttle-bone in company with Lepas and 

 small gastropods. Twenty-five specimens. 



TOGmm 



1mm 







^ 



a 



Fig. 2. Amphinome vagans. 

 a. Larva, b. Ventral bristles of Larva. 



Remarks. Of the 25 specimens more than half are larvae: the largest example 

 measures 8 mm. by 2 mm. including the feet, and the smaller of the larvae are about 

 1-25 mm. by -5 mm. including the feet. The more mature of the specimens are typical 

 except that the straight type of dorsal chaetae with denticulated edges is very scarce, 

 and the denticulation so fine that it can only be seen under a high power. 



This species is usually found on floating logs, etc., in conjunction with Lepas. The 

 younger larvae (Fig. 2, a) have about 10 chaetigers, the gills are not yet developed, and 

 the caruncle is not clearly differentiated. I cannot distinguish any eyes. There are 

 five head appendages which are presumably homologous with those of the adult 



