1907- Southern. — Oligochceta of Lambay. 75 



Fridericia connata, Bret, x 



1902. Bretscher, Rev. Suisse ZooL, p. 20. 



Several specimens of this worm were obtained. Bretscher states in 

 his description, that it resembles F. biselosa closely, except as regards the 

 form and disposition of the spermathecse. The remarkable feature 

 about the latter organs, in F. connata, is that they lie dorsally on the 

 oesophagus, and the basal parts of the ampulla are fused (Plate 19, fig. 

 11). The diverticula have long stalks, with hemispherical receptacles 

 for the sperm. The ampulla and stalks are coarsely granular. The 

 duct is long, and dotted with unicellular glands. In F. bisetosa the 

 diverticula are globular and almost sessile, the ampulla is small, not 

 granular, and enters the oesophagus laterally. In F. connata the 

 epidermis round the spermatheca pore is very glandular. The salivary 

 glands are twisted, but unbranched. The dorsal vessel rises in the 23rd 

 segment. In F. bisetosa it rises in the j8th segment. Length, 10-20 mm. 

 Setae, 2 in a bundle. Brain twice as long as broad, convex behind. 

 Corpuscles large and disc-shaped. The duct of the nephridium rises 

 variously on the post-septal. 



Distribution.— Switzerland. 



Fridericia Pcrrierl (Vejd).* 



1900. Michaelsen, '■ Tierreich," vol. x., p 98. 



Friend (i., p. 196) recorded this species from England, but gave no 

 details of its structure. The specimens from Lambay, and others from 

 various parts of Ireland, which I refer to this species, show several 

 points of difference from those described by Vejdovsky (1, p. 58). In 

 the first place, the salivary glands (PI. 19, fig. 12 A) bear only a distant 

 resemblance to the figure given by Vejdovsky, though it is just possible 

 to say that the branches rise in two bundles. Secondly, the anteseptal 

 of the nephridium (fig. 12 B) is oval, not slender, and the duct rises 

 from the front or middle of the post-septal. Vejdovsky does not state 

 the origin of the dorsal vessel. In my specimens it rises in the 22nd 

 segment. The Lambay specimens agree with Vejdovsky 's description 

 as regards size, brain, setae, spermathecae, sperm-funnel, and in the 

 common origin of the two anterior branches of the dorsal vessel. On 

 the whole, the evidence points to the identity of these specimens with 

 F. Perrieri. 



Distribution.— Denmark, Bohemia, Switzerland, Italy, Germany, 

 England {?). 



Fridericia polychaeta, Bret. x 



1900. Bretscher, Rev. Suisse ZooL, p. 450. 



This species was obtained in November in soil and moss. In several points 

 the specimens differed from Bretscher's description. They are 15- 25 mm. 

 long. The epithelium is somewhat opaque, owing to the presence of 



