GONIADID^ 



461 



Nordmanni) there is this difference, viz., that in the latter the dorsal longitudinal 

 muscles have a well-marked fold inferiorly, whilst in the former such is not present. 



The Groniadidae formed the first family of the Euniciformia Grlycerina of Levinsen 

 (1883), and fall under Benham's Grlyceridae, the tenth family of the Nereidiformia. In 

 the former classification there is no doubtful association, whereas in the latter the 

 Sphserodoridge follow, and then the Ariciidas. 



Goodrich observes that, as in Nephthys and Glycera, the segmental organ in Goniada 

 (Fig. 86) has no opening into the coelom, whilst a ciliated canal leads to the exterior — 

 through the septum, where it enlarges to form a lobed terminal organ — intermediate 

 between Nephthys and Glycera. The ciliated organ acts as a genital duct in Goniada 

 maculata. Fage, 1 again, sees in the closed nephridium, with its four rows of solenocytes, 

 and in the sudden development of the genital funnel at the moment of reproduction for 



end o 



r %- 



Fig. 86. — Diagrammatic reconstruction of the nephridium and genital funnel of a ripe Goniada maculata (Goodrich). 

 end org. End organ, gf. Genital funnel, nd. Nephridial duct. np. Nephridispore. (Goodrich.) 



the transmission of the sexual elements, a parallelism rather with the Phyllodocidas than 

 the Grlycericlas. 



Ehlers (1868) groups his Glycerea polygnatha (Goniada) as follows : — 



a. The terminal region of the proboscis without jaw-plates. 



Two jaws with hooks and twenty paragnathi. 

 Ex. Eone Nordmanni, Malmgren. 



b. The distal region of the proboscis with two rows of horny points (paragnathi). 



1. Two chief jaws, several V-shaped jaws. 



Ex. Goniada maculata, (Erst. 



2. Two chief jaws and a ring of spiked horny points. 



c. Surface of the proboscis with two longitudinal rows of horny points, with smaller 

 points on the ventral surface and angular plates on the side. 



Ex. Glycinde multidens, F. Mailer. 

 It is probable that the British forms range to America, and that, perhaps, the 

 synonymy of the species requires readjustment. 



1 ' Ann. So. nat./ 9 e set'., 



t. iii ; p. 311. 



