24 



DISCOVERY REPORTS 



ABBREVIATIONS USED IN TEXT-FIGURES 



DESCRIPTION OF SPECIES 

 Order ENTEROGONA Perrier, 1898 

 Suborder APLOUSOBRANCHIATA Lahille, 1886 

 Family POLYCLINIDAE Verrill, 1871 

 Subfamily Polyclininae Adams, 1858 

 Genus Aplidium Savigny, 1816 

 The genera Aplidium Savigny, 181 6, and Amaroucium Milne Edwards, 1842, are not readily distin- 

 guishable and recently there has been a tendency to regard them as synonymous. 



A varying number of diagnostic characters (Table 1) has been used by different authorities to 

 separate the two genera. 



Van Name (1945), using six diagnostic characters, noted that, even on this basis, 'there are inter- 

 mediate forms that may be assigned to either genus', (p. 28). He stated that Amaroucium 'hardly 



