ANTIOPA. 



Fig. 11. Jaws of Proctonotus mucroniferus : a and b, the two parallel plates ; c, anterior cap or 

 plate ; d, horny arch uniting the jaws. 



12. Two of the spines from the tongue of Proctonotus. 



13. Hepatic gland from a papilla of Proctonotus : a, glandular portion ; b, duct. 



14. Buccal organ of Hermcea dendritica, as seen in the compressor : a, oesophagus ; b, buccal 



organ ; c, oral opening ; d, tongue ; e, anterior attenuated termination of the same. 



15. Three spines from the tongue of Hermcea dendritica. 



16. Hepatic gland from a papilla of Hermcea bifida: a, central stem or duct; b, transparent 



belt on the same, marking the place of sphincter ; c, a portion of the central duct., 

 exhibiting the sphincter in a state of contraction. 



17. Buccal organ of Alderia modesta : a, oesophagus; b, buccal organ; c, tongue. 



18. Three spines from the tongue of the same. 



19. Penis of the same : a, crystalline spur at. the apex of the intromittent organ. 



