BRITISH NEMERTEANS, AND SOME NEW BRITISH ANNELIDS. 407 



segments and four distinct eyes. The head in the latter is pale, somewhat horse- 

 shoe-shaped, with two short conical tentacles in front, and two longer ones a 

 little behind — opposite the swollen part of the snout. A curved line separates 

 the anterior from the posterior region of the head, the former being flattened, the 

 latter more elevated, and furnished with four reddish eyes, the anterior pair of 

 which are about twice the size of the posterior. A little behind the anterior 

 pair a filiform tentacle projects upwards in the middle line, and close behind this a 

 wrinkled ridge (caruncle) extends to the anterior border of the third bristled 

 segment. The sulci between the first three bristled segments are somewhat less 

 marked, and the slope of the bristles more oblique, but the rest are very distinctly 

 separated ; indeed, the body has a somewhat moniliform aspect. The branchial 

 tuft springs from a point behind, and rather below the dorsal fascicle, and consists 

 of about four pale finger-like processes, which arise from a common basis ; they 

 commence on the second segment, and continue almost to the tip of the tail. In 

 this example, the swelling below the tip of the bristles, corresponding to fig. 1, «, 

 was not very evident, and the serrations of the extremely elongated distal por- 

 tion widely separated ; and, indeed, I was at one time disposed to regard the 

 animal as specifically different. The bristles of these animals are extremely 

 fragile, and the majority are broken during the efforts to decipher their structure. 

 The crop commences at the posterior third of the fourth bristled segment, and 

 extends to the posterior border of the sixth ; it is truncated anteriorly and pos- 

 teriorly, and swollen in the middle. The commencement is marked by two 

 brownish specks. The published descriptions of the species of Amphinome make 

 it somewhat difficult to determine them with accuracy, and I am by no means 

 certain at present that Savigny refers to this form under the above-mentioned 

 name. I had provisionally termed the two minute eyeless specimens from the 

 ^Shetlands Hipponoe jeffreysii,* but I think they may more correctly be grouped 

 with the example last described. The Eurythoe borealis of Sars| is a very 

 closely allied form. 



Lcetmonice filicornis, Kinberg4 — Three British species of the family Aphro- 

 ditaceaB are recorded in the Catalogue of the British Museum, and one since the 

 publication of the latter by Dr Baird ; but I agree with Dr Malmgren in con- 

 sidering A. borealis, Johnston, only the young of A. aculeata, and the Lcetma- 

 tonice kinbergi, described by Dr Baird,§ as L. filicornis of Kinberg,|| a species 

 which abounds on our north-western and northern shores, just as Hermione 

 hystrix does on our southern coasts. Kinberg does not show the recurved fang 

 towards the extremity of the ventral bristles — an error probably due to the 

 inaccuracy of his artist. The dorsal bristles are very large and powerful, and 



* Ann. Nat. Hist. Oct. 1868. f Christ, vid. Selsk. Forh. 1861, p. 56. 



X Kongliga svenska Fregatten Eugen., &c, 1851-1853, p. 7, taf. iii. fig. 7. 



§ Dr Baird is now of the same opinion. || Proc. Linnean Soc. vol. viii. p. 180. 



