98 EEY. HILDERIC FRIEND ON 



2. Paranais litoralis (0. F. Mull) Czem. (Zool. Dan. 1788 ; 

 syn. Uncinais, Beddard^ Monograph, p. 295.) 



Has a blunt prostomium. Setfe vary in length and thickness. The subject 

 o£ some interesting notes by Benham and Bourne. The worm was I'eceived 

 by the former, along with other aquatic annelids, from Sheeraess : Benham 

 (2), p. 187. 



3. CH.ETOGASTER DiASTROPHUS, Gridth., Benham (2), p. 212 ; near Oxford. 



4. Ch^togaster diaphanus, Griiith. (The synonymy is given by 

 Beddard and Michaelsen.) 



Southern (9) marks its occurrence in England and Scotland with a query, 

 but I have recently been able to demonstrate its indigenous character beyond 

 doubt, since it occurs plentifully in the neigbourhood of my home. 



5. C^H^TOGASTER CRYSTALLiNUS, Vejcl. (Cf. Laukester, Trans. Linn. Soc. 

 xxvi. (1869) p. 641.) 



For the various species of JS^ais and iJero it suffices to refer to Bousfield 

 and Bourne. I have, however, to add one species to the list, and as I can 

 find nothing exactly corresponding with it in the various authorities, it must 

 for the present be held to be new to science. 



6. Dero olearia, sp. n. 



Forked setse beginning in 2nd segment ventrally ; 1-5 per bundle, slender, 

 as long as half the diameter of the body ; the ui)per tooth larger than the 

 lower, and the node in the middle, or approaching the first (inner) third. 

 The dorsal setaa begin in segment 6; each bundle consisting of one capilli- 

 form and one forked seta. There are three forked setre of equal length in the 

 ventral bundles posteriorly, but the sette in the anterior ventral bundles vary 

 slightly and progressively in length, the dorsad being longer than the ventrad. 

 The forked seta? of the dorsal bundles are more slender and straight than 

 those found in the ventral sets, and the teeth are small. Length of entire 

 worm 8-10 mm. 



The chloragogen cells, which are black, begin in segment 6 along with the 

 capilliform setse. At rest the prostomium equals the individual setigerous 

 segments in length, and is 3-4 times as long as the peristomium, or first 

 segment, which carries no setse and is exceedingly small. No taste-hairs or 

 papillse are present. The segments number 40; there was no sprouting 

 zone or bud, nor was a girdle developed. Eyes are wanting. 



The living worm is exceedingly active, swimm.ing freely in water, but 

 breaking up almost as soon as it is placed on the microscopic slip, even if not 

 subjected to pressure. This makes it difficult to work out the details. I believe 

 it has the gills which distinguish Dero from JS'ais ; and a special character is 



