398 Transactions of the Society. 



Synchseta littoralis sp. n. 



PL VII. fig. 15. 



Spec. Char. — Body cone-shaped, convex anteriorly, usually 

 cylindrical in the middle, tapering to a stout foot and well sepa- 

 rated acute toes ; auricles small ; four frontal styles. Eyes three, 

 one cervical, large, red, connected by two streams of red granules 

 with two frontal eye-spots ; lateral antennae prominent in lumbar 

 region. Size up to 238 /x (j^j in.) long by 109 /x {^2 i n> ) wide 

 at the auricles. In brackish water. 



For some years past I have received this distinctive species 

 from Dundee, Margate, Great Yarmouth, and various places near 

 the sea coast, always in water that was slightly brackish In 

 general appearance and structure it comes nearest to S. oblonga, 

 from which it can, however, be readily distinguished by a much 

 stouter foot, by its three eyes, and a prominent stream of red 

 granules running forward from the cervical eye, which is unusually 

 large, to the two frontal eye-spots, very much resembling S. tri- 

 o-phtlialma, in this respect. 



The front of the head is convex, and the shape of the body 

 more or less cylindrical, merging posteriorly into a conspicuously 

 stout foot with two fairly thick acute toes, which are always 

 carried well apart. The outer styles emerge from fairly large tri- 

 angular fleshy flaps, and at the extreme front of the head are two 

 bundles of very fine diverging sense-hairs. The dorsal antenna is 

 situated in its usual position, and the lateral antennas, which are 

 readily visible, protrude from the sides in the lumbar region and a 

 little on the ventral side. 



The integument is white, transparent, folded longitudinally on 

 the dorsal side. The mastax is large, of usual shape and structure, 

 and the unci have five or six teeth. The thick-walled stomach is 

 surmounted by two rounded gastric glands. 



The remainder of the anatomy follows that of other Synchaetse ; 

 the eggs are not carried. 



The male has been seen several times, and has much analogy 

 with that of S. oblong a. 



The accompanying fig. 15 has been drawn by Mr. Dixon - 

 Nuttall, and gives a good idea of the animal. 



EXPLANATION OF PLATE VII. 



Fig. 14. — Synchseta triophthalma Laut. ? Dorsal view, x 400. 

 „ 14a ,, „ „ One uncus of the jaws. 



„ 15 „ littoralis sp. n. Kouss. ? Dorsal view, x 375. 



,. 16 ., cecilia sp. n. Rouss. $ Dorsal view, x 500. 



„ 16a „ „ „ Side view of toe. x 750. 



„ 166 „ „ „ The male. X 500. 



