EXPLANATION OF PLATE XVIII. 
Atopos (Parapodangia) gravelyt, n. sp. 
Fic. 18—Proboscis, its radular portion (a) 
Cai. 
18a.—Ventral view of the proboscis with the ends of the 
salivary ducts, X I. 
,, 18b.—Longitudinal section of proboscis, X 2. 
,, 19.—Salivary gland with the two ducts (a), X I. 
, 20.—Genital organs; 1, hermaphrodite duct; 2, rectum; 3, 
hermaphrodite gland. 
», 21.—Inner surface of the gland. 
3. 22: Pedal pland, <x <x. 
»» 23-—Suprapedal gland, x 1. 
;» 24.—Transverse section of the pedal gland, X 103. 
», 25.—Longitudinal section of the suprapedal gland. | 
;, 26.—A portion of the same marked a-b in fig. 25. | 
and salivary gland, (), 
d 
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