18 Transactions of the Socicti/. 



17. Fridericia michaelseni Bretsclier. 



Soiitliern justly remarks that this is one of the most prevalent 

 British species of Enchytrteids. It is very common in soil, under 

 stones, among manure and elsewhere. The British species agree 

 with the Danish, in being destitute of glands at the opening of the 

 duct in 4/5. There are 6-7 set?e in a bundle, and the cuticle has 

 several rows of dark glands in each segment. 



British Records. — Southern, 1907, as Fridericia galha, 1909 

 (Contributions, p. 164), several Irish and Scotch localities ; Port 

 Erin, Isle of Man. In England I have found it at Malvern, Easter- 

 tide, 1911 ; Newark in Notts, and Eepton in Derbyshire, May, 

 1911; Cauldvvell, July 10th; Sutton Broad, August, 1911, and 

 elsewhere. 



18. Fridericia vcddensis Issel. 



" This species, recently described by Issel from Italy, has been 

 found in two localities in co. Wicklow. The Irish specimens agree 

 very closely with Issel's descriptions and figures, in all points but 

 one. Issel figures the duct of the nephridium as rising from the 

 • end of the postseptal, whereas in tlie Irish specimens it rises just 

 behind the septum. This, however, is a very variable point in the 

 genus." — Southern (Contributions, p. 160). My experience is that 

 lie duct often varies in point of origin with the anterior, median, 

 or posterior position of the nephridia. 



British Records. — Bray Head and Powerscourt, Wicklow 

 county, Ireland. 



19. Fridericia paroniana Issel. 



Closely resembles Fridericia hisetosa Lev., and F. connata Bret- 

 Issel has tabulated the difterences, and made the matter clear, in 

 Atti Soc. Ligustica, 1904, xv. p. 3 ; and Zool. Jahrbuch, 1905, 

 xxii. p. 466. 



British Records. — Dublin and Wicklow counties in Ireland, 

 Southern (Contributions, p. 161) ; Acresford, near Ashby-de-la- 

 Zouch, July, 1911, first English record. 



20. Fridericia leydigi Yejdovsky. 



Southern finds specimens from Ireland and Isle of Man differ 

 from the original description in several points. " The brain is 

 convex in front, not concave. There are 2-4 seta? in the anterior 

 ventral bundles. The length varies from 4-10 mm. ; the dorsal 

 vessel rises in the 15th segment. The salivary glands are entire, 

 or divided into two short branches at the end." Bretsclier (Eevue 

 Suisse, 1902, x. p. 23) has drawn attention to the relationship be- 

 ween leijdigi and minuta. Issel says truly that the group requires 

 careful study and revision, and (Zool. Jahrb., 1905, xxii. p. 468) 

 proposes to undertake it. I have devoted much time to the sub- 



