Southern — Monograph of the British and Irish Oligochoeta. 159 



same breadth, and about three times as long as the anteseptal, and it passes 

 gradually into the narrow duct. In the posterior end of the worm, the 

 nephridia are extremely long and narrow. The intestine is covered with 

 large peritoneal cells, which are greenish-yellow in colour. There are three 

 pairs of septal glands. The dorsal vessel is intra-clitellar in origin, rising in 

 the 12th or 13th segment. The sperm-funnel (fig. 14, g) is comparatively 

 very large, about three times as long as broad. Its width is half that of the 

 segment. It is covered with small shining cells, placed in regular rows 

 alternating with dark stripes. The lip is constricted and conspicuous. The 

 duct ends in a penial bulb, half as large as the funnel. The spermatheca has 

 a very unusual structure for this genus. The ampulla (fig. 14, E and f) is 

 large, and distinctly divided into 5-8 lobes. These are filled with sperm, 

 and connected by wide apertures with the central cavity. The duct is about 

 three times as long as the ampulla, and is thickly covered with glands along 

 its whole length. There is a rosette of large glands near the pore. 



No other species of the genus is known having a lobed spermatheca. 



February — April. 



Habitat — Ireland. Co. Dublin (Howth). 



Genus Fridericia. 



The number of species in this genus, which was 21 in the Tierreich of 

 1900, has now risen to about 65. As the number of characters on which the 

 species are founded is very small, and these characters themselves do not 

 show a very wide range of structural variation, it follows that the differences 

 between some of the species are very small. For instance, in the group of 

 species distinguished by having two diverticula to the spermatheca, it is 

 extremely difficult to assign a specimen to a particular species. It usually 

 bears an equally close resemblance to several species. In these circum- 

 stances, the need for a revision of the genus is very urgent. 



Fridericia bulbosa (Ptosa). 



1900. F.h., Michaelsen in Tierreich, vol. x., p. 96. 



1907. F. Jj., Southern in Irish Nat., vol. xvL, p. 72, pi. 19, fig. 7. 



June, December. 



Habitat — Ireland. Co. Donegal (Milford) ; Co. Dublin (Lambay). 



Didribution — ^ONQ, Zembla; Germany; Switzerland; Italy; Pennsylvania. 



Fridericia striata (Levins). 



1898. F. s., Friend in Zoologist, p. 121. 



1900. F. s., Michaelsen in Tierreich, vol. x., p. 96. 



&. I. A. PROC, VOJL. XXVII., SECT. B. [2 B] 



