^^Q Transactions of the Society. 



very short. Nephridia (fig. 29) of posterior segments with large 

 anteseptal, and duct shorter than postseptal, from the hindermost 

 third of which it springs. 



This species is allied to F. j^errieri, but the differences are 

 numerous and constant ; the reversed sessile diverticula being 

 characteristic. Found in soil on the banks of the Canal in 

 Nottingham, November 7, 1911. Eecorded in Kep. and Trans. 

 Nott. Nat. Soc. for 1910-11, p. 41. 



1 may remark that Fridericia diachieta Bretscher and F. mo.eu- 

 lata Issel have also been added to the British lists from Nottingham 

 and other localities during the year. 



3. Fridericia nigrina sp. n. 



To be distinguished from Enchytrseus nigrinus, which it at first 

 sight closely resembles. Very minute, usually about 3 or 4 mm. 

 in length, with 25-30 segments. Fragile, white to naked eye, 

 with very large opaque coelomic corpuscles which do not readily 

 break up or dissolve when forced out, as is the case with some 

 others. Set?e always 2 per bundle, large, especially posteriorly, 



and slightly bent within. None 

 on the ventral side of girdle in 

 the adult worm, which covers the 

 12th and half the 13th segment, 

 and has large pores and glands 

 at the opening of the very long 

 fnt. sperm-duct. Ampulla large, two, 

 three, or even four times as long 

 as broad, with no distinct neck or 

 CtmH Srdiv v collar. Dorsal vessel arises about 

 segment 14. Salivary glands could 

 not be seen, and nephridia masked 

 ^Qfjf by the large opaque corpuscles. 



Three pairs of septal glands. Brain 



Fig. 30.— Spermatheca of small, changing in appearance with 



F, nigrina Friend. ^j^^ movements of the body. The 



spermathecie are remarkable ; the 

 duct is short, without glands at the opening, but with an irregu- 

 larly shaped ampulla (fig. 30) from which glands or diverticula are 

 given off. Several species of Fridericia resemble this in the 

 number of seta?, but the spermathec?e and coelomic corpuscles at 

 once differentiate it. Distinct from F. irregularis Br., though the 

 spermathecse seem to clearly resemble each other. 



Found at Hastings, December 21, 1911, and at Stretton-en-le- 

 Field, near Ashby-de-la-Zouch, somewhat earlier in the year. 

 Not previously placed on record. 



