On SynchiVta fennica sp.n. By Charles F. Eousselet. 171 



Nuttall, with his well-known skill, has made the excellent draw- 

 ings which accompany this paper, plate V. figs, 1« and lb. 



The specific characters of this species may be stated as 

 follows : — 



Body cylindrical, elongate, curved, tapering posteriorly to a 

 short tubular foot carrying two small toes. Head rounded ante- 

 riorly, with well developed auricles, carrying four frontal styles and 

 a frontal tubular antenna, in addition to the usual dorsal antenna 

 above the eye. Eye cervical, single, having the appearance of two 

 appressed halves. Attached dorsally and closely below the ciliary 

 wreath are two stout tubular appendages, directed outward and 

 backward, containing no organs, and being prolongations of the 

 integument and communicating with the body-cavity. The posses- 

 sion of these appendages is very characteristic of this species, and in 

 this respect resembles S. bicornis, which has similar horn -like struc- 

 tures somewhat lower down, below the dorsal antenna. 



In contraction, when the head is invaginated, the appendages 

 are thrown forward and diverge, producing the hammer-shaped 

 structure at first observed. When fully contracted the cylindrical 

 body is much curved, convex dorsally and concave ventrally, 

 somewhat in the form of a crescent. Two lateral antennae were 

 detected in the lumbar region, about two-thirds down the side of 

 the body. 



The mastax could not be investigated in the few specimens 

 received, but is evidently of the usual Synchieta type. Plate V. 

 fig. lb, gives a frontal view of the head. 



The rest of the structure appears to be quite normal and 

 requires no further description. The male is not known. 



Size : length, 238 p ( T £ 7 in.) ; width of body below auricles, 

 G8 p (3J4 in.). 



Habitat : marine, in the Bay of Bothnia, near Helsingfors. 



Synchzeta bicornis Smith, plate V. fig. 2. 



The figure which Mr. J. C. Smith has given of this species is 

 so diagrammatic in character, that I take this opportunity to 

 reproduce a drawing which Mr. Dixon-Nuttall has made from 

 some well-preserved specimens sent to me by Mr. Smith. Plate 

 V. fig. 2. 



From this sketch it will be seen that the horn-like appendages 

 are situated dorsally, just below the dorsal antennae, and are 

 curved forward. This species possesses three eyes, the two 

 frontal eyes being connected by red granules with the cervical 

 eye, as in S. triophthalma and S. littoralis. In size it is somewhat 

 smaller, but in the curvature of the body it has considerable 

 resemblanoe with S. fennica. 



Size : length 210 /j, (j-Jq in.). 



N 9 



