346 THE PEOCEEDINGS OF THE LINNEAN SOCIETY 



and in the centre, two obscure dark spots, one behind the other. 



The dorsal cirri are long and slender, with an irregular longi- 

 tudinal black stripe; the ventral are somewhat shorter and 

 colourless. The anal appendages are large, stout, cylindrical, and 

 colourless. 



The dorsal setas are straight, and very long and stout. They 

 are moderately blunt, and serrated near the apex ; the serrations 

 being between fourteen and twenty-one in number, and harpoon 

 shaped. The ventral setaa are not so numerous as the dorsal ; 

 are very long, about equalling the dorsal in this respect, and are 

 much more slender than the latter. They are bifurcated at the 

 tip ; the smaller branch being exceedingly short. 



Hah. Cape Sidraouth. (Chevert Exped.) 



6. — EuPHROSYNE Mastersii, sp. nov. 



The oval depressed body is an inch in length, half-an-inch in 

 breadth, and consists of about forty segments. The dorsal in- 

 tegument of each segment is marked out into numerous poly- 

 gonal areae by striae. On the ventral surface, just in front of the 

 mouth, are two swollen lobes, consisting of the dilated oral ends 

 of the two halves of the first somatic segment. On the ventral 

 surface of the prestomium, in front of and between these lobes, 

 is a black spot. The caruncle consists of a central midrib and 

 two crenated lateral bars, between which and the midrib, on each 

 side, is situated a smooth fleshy lobe. Rising from the anterior 

 end of the midrib is a short stumpy process, representing the 

 tentacle, and at its base are the single pair of eyes. The 

 branchiae are ramose, and arise by as many as nine or ten 

 distinct roots from almost the entire breadth of the foot. The 

 main trunks divide and subdivide to form dendroidal masses, 

 the terminal twigs of which are slightly expanded and phylloid. 

 Behind the long slit like anal aperture, situated on the dorsal 

 surface, is a single, large, rounded anal appendage. 



The setae are, as is characteristic of the genus, all bifurcate. 

 Those of the dorsal tubercles are numerous and free from serra- 

 tions ; the shorter branch is a mere tooth, about one-fourth of the 

 length of the longer, which has a gentle curvature inwards 



