BY WILLIAM A. HASWELL, M.A., B.8C. 277 



the retracted state, are longitudinally folded. Following upon 

 this is the powerful muscular gizzard, which is armed with teeth 

 very much resembling those of Polynoe. The intestinal cseca 

 are branched, and though more complex, very much resemble 

 those of Pohj7io'c in structure. The ventral ganglionic chain 

 does not present distinct dilatations, but remains, as in many of 

 tlie order, of tolerably uniform diameter throughout ; the cord 

 itself is surrounded by a layer of large ganglion-cells which are 

 not confined in ganglia, but run along the whole length of the 

 cord ; here and there they may be seen to give off processes into 

 the interior of the cord. 



Iphione fimbriata. 



Iphione fimhriataf Quatref., 1. c, p. 271. 



Head very small, covered. Antennre long, dilated towards the 

 apex. Inferior tentacula very stout, very long ; upper long, only 

 bifurcate towards the apex. Body composed of 28 rings. Elytra 

 26 ; first small, rounded ; rest moderate, scarcely decussated in 

 the middle of the back, not reniform, fimbriated on their whole 

 external margin. Upper antennae very long. Cirri with subulate 

 apices. \_Quatrefagetr\ 



Torres Straits, [Paris Mus.] 



Fam. POLYNOINA. 



Genus Tiiormora, Baird. 



Thormora Jukesii. 



Thormora Jalce8iij'^2iiv(\.y 1. c, p. 199. 



Animal about 1 1 inch long, rather more slender at the anterior 

 extremity, elongated, and of a very dark colour. Antennae and 

 tentacla nearly of tlie same length, incrassated a little below the 

 apex, where they suddenly become produced to a fine slender 

 point. Palpi longer than antennae or tentacle, conical at the 

 base, setaceous at the point. Buccal cirri of about the same 



