70 The Irish Naturalist. February, 



ENCHYTR7EIDJE. 



Special attention was paid to the Enchytraeidae of Lainbay. The lit- 

 toral forms were not of so much importance as those occurring inland, 

 and only one species, Marionina semifusca, was collected. Altogether 

 21 species were obtained. The genus Fridericia, as usual, predominated 

 with ii species. 



Henlea ventriculosa (Udek.)* 



1896. Friend, Essex Naturalist, vol ix., p. no. 

 1900. Michaelsen, " Tierreich," vol. x., p. 69. 



I have found this worm in various parts of Ireland. 



Distribution.— England — Essex (Friend). Common in Europe. 



Henlea Dickson! (Eiseu). x 



1900. Michaelsen, "Tierreich,'' vol. x., p. 68. 



Two specimens of this worm were found. They were very small, 4-5 

 mm. in length. Number of segments, 34. Salivary glands were not ob- 

 served. Prostate gland very large. The brain is straight behind, not 

 concave, as described. It is concave in front, and the sides diverge 

 backwards. The spermatheca (PL 19, fig. 5 ) consists of an oval 

 ampulla, with an efferent duct twice as long as the ampulla. The duct 

 leading into the oesophagus is equal in length to the efferent duct. 



Distribution. — Nova Zembla. Germany. Switzerland. 



Henlea hibernica, n. sp. 



Henlea hiberniea is a stout worm of a greyish-white colour. It is very 

 opaque, owing to the glandular epithelium. 



Length, 15-20 mm. Number of segments, 60. 



The head-pore shows as a large transverse slit, between the prostomium 

 and the first body segment (PL 18, fig. iA.) Ventral setae 5-9 in a bundle, 

 lateral setae 5-7. They are slightly curved, and the inner ones are 

 shorter than the outer ones. The clitellum occupies segments \ n-13. 



The brain (PL 18, fig. iA), is longer than broad. It is slightly convex 

 in front, and emarginate behind. The ccelomic corpuscles are circular 

 discs, granular and nucleated. The salivary glands are long and twisted, 

 lying on the ventral surface of the oesophagus. The oesophagus passes 

 suddenly into the mid-gut at the boundary between the 8th and 9th 

 segments (PL 18, fig. iB), The oesophagus projects into the mid-gut, 

 forming a valve-like structure (a 7 ). From the front of the mid-gut two 

 oesophageal glands (a) project into the 8th segment. They lie dorso- 

 lateral^ to the oesophagus. The dorsal vessel rises in the Sth-9th seg- 

 mental groove, and has 3 contractile swellings in the 8th, 7th, and 6th 

 segments {b, c). The nephridium (PL 18, fig. iD), consists of a long narrow 

 anteseptal portion, a broad post-septal 1I-2 times as long as the ante- 

 septal. The duct rises near the septum. The sperm funnel is 3-4 times 

 as long as broad, with parallel sides. The duct is fairly long. 



