DE. BATED ON THE APHEOBITACEAN ANNELIDES. 199 



tlie animal and the uumbei' of tlie elytra. Most of tlie dorsal 

 cirri, too, have fallen off. 



Hob. Along with the preceding species, from a depth of 300 

 fathoms, in lat. 74^° S., long. 175i° E. {Mies. Brit.). 



Grenus VI. Thoemoea, gen. nov. 



Bases of antennee produced from the anterior margin of the 

 cephalic lobe ; elytra 12 pairs, not covering the middle of the 

 back, and leaving the posterior segments of the body naked ; setae 

 of dorsal branch of feet of two kinds ; body elongated. 



Sp. Thoemoea Jukesii, sp. nov. 



Ajiimal about 1|- inch long, rather more slender at the anterior 

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

 tentaculum nearly of the 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 length as 

 the palpi, and, like the antennae and tentacle, incrassated below 

 the apex, and terminating suddenly in a sharp slender point. 

 Elytra 12 pairs, but apparently small, and leaving the middle of 

 the back and lower portion of the body uncovered. They are of 

 a rounded form, tuberculated on the surface, and ciliated on the 

 external margin. The feet are stout, biramous. Bristles of 

 ventral branch stout, of a yellow colour, somewhat curved near the 

 apex, and a little below the point strongly serrated and striated 

 across. The fascicle of bristles springing from the dorsal branch 

 is composed of two kinds, — one numerous, slender when com- 

 pared with those of ventral branch, straight, acute at the point, 

 and very finely serrated on both sides ; the other, slender hairs, 

 longer than the others, very numerous and quite smooth, appearing 

 like a brush of fine hairs intermixed with the bristles. The 

 dorsal cirri are, like the antennae, incrassated below the apex, and 

 ringed with black, and terminating suddenly in a fine slender 

 point, Yentral cirri of feet setaceous, and reaching nearly to the 

 apex of the ventral branch of the foot. Anal cirri stout, and of 

 the same structure as the dorsal. 



In the way in which the antennae are attached to the cephalic 

 lobe, and in the number of elytra, this species might appear to 

 belong to the genus Lepidonotus as restricted by Eanberg ; but 

 the disposition of the elytra, their leaving the middle of the back 

 and the posterior segments of the body uncovered, distinguish it 



15* 



