20 Transactions of the Society. 



nepliridia possess an anteseptal, which is one-third the size of 

 the postseptal, and the duct springs from near the middle of 

 the latter portion, which is clearly rounded behind. 



Fig. 5. — Bi'p.in of Friderica Fig. 6. — Spermatheca 



callosa Eisen. of Fridericia callosa 



Eisen. 



British Record. — Swain's Park Crossing, near Swadlincote, 

 Derbyshire, October 3, 1911. 



23. Fridericia Itelcetica Bretscher. 



A very small worm, 6-7 mm. in length, of 40 segments, trans- 

 parent. SetiC 4 in front, iinequal, 3 in the middle and 2 behind. 

 Head very blunt ; girdle, of about 26 large rows of cells, extending 

 over xii-^ xiii. No sette on the twelfth segment. Eirst nephridia 

 in 6/7, dorsal vessel arising in a clear gland-like space in or 

 near segment xxii. Three pairs of septal glands of the usual type. 

 Anteseptal of nephridia large, scarcely narrowing into a neck at the 

 septum, half as long as the postseptal in the anterior segments. 

 Nerve-chord enlarged in first four segments. Chloragogen cells 

 brown, wanting in some cases in segments ix-xii. Brain convex 

 behind. Spermathecie with fairly long duct, no external glands, 

 2 diverticula. 



British Record. — Acresford, near Ashby-de-la-Zouch, July 2, 

 1911. 



24. Fridericia humilis Friend. 



A tiny worm of 35 segments, 5 mm. long, transparent not only 

 in the body generally, but also at the girdle, which carries two 

 pairs of dorsal setpe, but no ventral. Sette invariably 4 in segments 

 i-xvi (except the girdle segment xii), and 2 behind, sticking out 

 like spines from a blackthorn. The middle setre in front segments 

 rather more than half as long as the outer. Each segment with 

 about 8 annuli. Ampulla of sperm-duct about twice as long as 

 broad. Nerve much enlarged in first five segments. Head some- 

 what glandular, not blunt as in the last. Brain with a large pro- 

 jection in front and straight behind, narrowing towards the front 



