Oatty Marine Laboratory^ St. Andrews. 307 



liaving smooth dorsal cirri and iu the structure of the 

 bristles, which, however, diverge very little from those of 

 E. cornnta, Katlike. The figures of Langerhans, represcutiiig 

 tlie bristles of the secoud and twenty-third segments, are the 

 only ones available. 



Of Eusyllis htmelligera, Marion and Bobrttzky, Allen 

 observes that it is a well-defined species, distinguished by 

 the enlarged and leaf-like shape of the first ventral cirri. 

 He dredged a female with nearly ripe eggs in July on 

 Mewstone Ledge, Plymouth. Marion and Bobretzky procured 

 a ripe male in January without swimming-bristles. They 

 consider that, though it approaches E. blomstrandi in the 

 non-mouiliforni dorsal cirri, in the fusion of the palpi at the 

 base, and in the presence of six distinct eyes on the head, it 

 is different. The first dorsal cirrus is long and the first 

 ventral cirrus is foliaceous. The bristles, moreover, differ. 

 No example has been seen by the writer, but Dj. Allen 

 intends to publish an account of this and other forms he has 

 recently procured. 



Eusyllis monilicor7iis, Malmgren, was dredged by Allen at 

 Plymouth, and it is apparently more common in the south 

 on both sides of the channel. It has six eyes, two being 

 small, and the palps are long, but fused at the base. There 

 are from fifty-two to sixty-seven segments of the body, 

 which is from 10 to 15 mm. long. The dorsal cirri of the 

 second and filth segments are longer than the following, 

 which are unequal amongst themselves. The feet have two 

 kinds of bristles, viz., those with long and those with short 

 tips. The colour is pale orange Mith a patch of dark brown 

 or black on tlie hind part of the head. 



Autolytus macrophthalmus , Marenzeller, occurs both at 

 Plymouth and on the west coast of Ireland. The head 

 is distinguished by the large size of the eyes which cover a 

 considerable portion of the surface, and there are occasionally 

 a few additional specks. The length of the body varies troni 

 8-20 mm. The violet or reddish proboscis is barrel-shaped 

 and has forty-four rows of violet points. The colour is light 

 orange and the tips of the tentacles are orange. 



De St. Joseph met with an example of 20 mm. in length 

 in which the sexual elements covered the dorsal vessel and 

 fell into the ccelom ; and another of seventy-two segments 

 in which the head of a female bud with four eyes appeared 

 at the fourteenth segment, yet it had no ova, no swimming- 

 bristles, and no modification of the intestine. A third 

 example, a nurse-stock of thirteen segments, had a female 



20* 



