106 



Bulletin VanderbUt Marine Museum, Vol. VII 



Text figure 7. — Thelepus plagiostovm Schmarda: four views of the un- 

 cini, showing the basal knob and main fang, above which is seen a transverse 

 row of a pair of teeth and median tooth; from the Falcon Island specimen. 



Discussion : This specimen, which has the praestomium more 

 deeply retracted and consequently somewhat difficult to decipher, 

 appears to agree in all essentials with that figured for the type. 

 It is about 12 centimeters long. The posterior portion of the body is 

 moderately swollen, then tapered, forming a short, nearly smooth 

 cone, composed of numerous, densely crowded, small somites, most 

 difficult to accurately decipher in the shrunken specimen. The 

 abdominal pinnules are small, not protruberant ; not found on the 

 last few somites. The dorsal capillary setae are not found on the 

 last eleven unicinigerous somites. The uncini have a basal knob 

 and the main fang, above which there is a transverse row of a pair 

 of teeth and a median one. 



References: Terebella plagiostoma, Schmarda, L. K., Neue 

 wirbellose Thiere, II, Leipzig, 1861, p. 41, pi. 24, fig. 196 

 (color). 



Thelejms plagiostoma, Augener, H., Polychaeta II, Sedentaria. 

 Die Fauna Sudwest Australiens, 1914, Bd. V, p. 95, Jena 

 (synonymy) ; Vidensk. Meddel. Kjobhavn, 1926, vol. LXXXI, 

 p. 239.— Fauvel, p., Archiv. Zool. Exper. Gen., Paris, 1919, 

 t. LVIII, p. 455, fig. 10 ; Mem. Indian Mus., Calcutta, 1932, vol. 

 XII, p. 233 (synonymy). 



