NOTODELPHYS. 
307 
Oetochilus septentrionalis, Goodsir. (Plate XVIII. 
fig. 2.) — Bright-red and slightly translucent; about a line 
and a half or two lines long. Antennae very long and 
slender, of twenty-four joints, the twenty-second and twenty- 
third joints each furnished with a long seta pointed down- 
wards and inwards. 
Hab. Birth of Porth. 
Next to Cetochilus Dr. Baird provisionally places the next 
genus, which he says must form the type of a new family. 
Gen. 168. NOTODELPHYS, Allman . 
One eye. Head and first ring of thorax consolidated. 
Thorax of four, and abdomen of four segments. Upper an- 
tennae many -jointed ; lower prehensile. Pour pairs of foot- 
jaws. . Ovary, a large sac placed behind the last ring of the 
thorax, and within the parietes of the body.^ 
Notodelphys ascidicola, Allman. (Plate XVIII. fig. 
3.) — Upper antennae of twelve short joints, each with one 
or more setae. Abdomen somewhat cylindrical. 
Hab. Belfast Bay, and other Irish harbours: found swim- 
ming freely in the branchial sac of the Ascidia communis. 
* Hence the name, from vcaros, back, and SeA (pvs, matrix. 
