290 Transactions of the Society. 



Regent's Park, Kew Gardens, and Glasnevin, Dublin. Southern 

 (Contributions, p. 135) points out differences between the Dublin 

 and the Regent's Park specimens, but does not suggest that they 

 are of sufficient importance to constitute a new form. My own 

 studies have been limited to those found at Kew. At present 

 there is nothing new to add. 



VIII. Genus Hemitubifex Eisen. 



\1. Hemitubifex Benedeni (= benedii) d'XJdek, 



Found on the coasts of England and Ireland. For the present 

 we are content to retain the genus, certainly not to merge it with 

 Psammoryctes as we understand it. 



Distribution and references in Beddard, Michaelsen, and 

 Southern. 



2. Hemitubifex pustulatus sp. n. 



In 1898 I published in the Zoologist some Notes on British 

 Annelids (ser. 4, ii. p. 119), and referred a species obtained 

 from Malahide in Ireland to Hemitubifeo: benedii, on account of 

 the body being covered with papillae. A wider acquaintance with 

 our native Tubificids proves this to have been incorrect, and as no 

 description with which I am familiar agrees with the worm under 

 consideration, I name it anew, with the following characters: — 



Setse of two kinds, capilliform and forked. A wonderfully fine 

 and interesting worm about an inch (25 mm.) in length. First 

 third of the body about three times as thick as the posterior two- 

 thirds. Number of segments about 70. Head very small in com- 

 parison with segments 5-15. Body entirely covered with uneven 

 papillae, very dark, in irregular rings. Capilliform and forked setse 

 alike going right along the dorsal portion of the body to the tail. 

 Capilliform setee remarkable for their number, 6-8, or as many as 

 9-10 in each bundle anteriorly, gradually decreasing in number 

 towards the tail, where 1 or 2 per bundle exist. The forked ventral 

 setse with a very strong curve and larger under tooth. Dilating 

 hearts in the 7th and 8th segments. Dark chloragogen cells begin 

 in the 5th segment. 



Received from Dr. Trumbull, Malahide, Ireland, April 1, 1896. 

 Has not since been found. My types, owing to removal, are packed 

 away, and are not at present accessible. I have not been able to 

 refer to liais ]mstu/osa Williams (Phil. Trans. (1858) p. 96), which 

 Beddard gives doubtfully as a synonym for Hemitubifex benedii. 

 It is possible that Peloscolex variegatus Leidy and A^ars ixqnllosa 

 (Beddard, Monograph, pp. 258-9) are related to this species, and it 

 is much to be desired that fresh material mav be obtained in order 



