14 FESTSKRIFT FÖR LILLJEBORG u 



which al way- seems to be in the same tension as regards the cell walls and always 

 in the same position to the base of the cell, may serve as a kind of sounding-board. 

 It i- also principally in the equatorial of this floor that are situated the row of 

 sup ganglion cells or nerve plates which surround the sense cell. 



Literature. 



BEDDARD, FRANK E. The Earthworms of the Vienna Museum. Ann. and Mag. Nat. Hist. Feb. 1892. 

 Bkddard, FRANK E. Ob ns on the structural characters of certain new or little-known Earth- 



worms. 1'roc. Roy. Soc. Edin. Vol. XIV. Pages 156, etc. 

 BEDDARD, FRANK E. A Monograph on the order of Oligochaita. 1895. Oxford. 

 HORST, DR. R. Earthworms from the Malay Archipelago, Zoologische Ergebnisse einer Reise in Niederl. 



! Indien, von Dr. Max Weber. Bd. II. Leiden, 1892. 

 PERRIER, Edm. Etudes sur ['Organisation des Lombriciens Tcrrcstres. Archives Zool. Exp. IX. 

 •. l>r. DANIELE. I Lombrici racolti nell' isola Nias, etc. Ann. Museo Civ. Genoa VII (2). 



Explanation of the Figures. 



Plate I. 

 Pcmtoscolex Lilljeborgi. 



Longitudinal section of the anterior somites, partly diagrammatic, sketched from a specimen cut 

 in half. 

 I. c. cephalic lobe or prostomium. 

 br. brain, 

 ■•ph. gl. supra pharyngeal glands opening into the pharynx, 

 m. gl. mucus gland. 

 c. gl. calcifcrous glands or diverticula. 

 h. hearts. 

 giz. gizzard, 

 spth. spcrmathec.e opening in the posterior part of somites viii, ix, x. 

 v v. ventral vessel. 



iepta. The one between IX X is always missing. 

 is. interseptal muscles, posterior to the last spermatheca, connecting the body wall with the sep- 

 tum. There is no septum adjoining this spermatheca. 

 I. r 

 j. the 111. 1, t 1 ,,f the thick septa. 



f /'. Lilljcborgi, natural size. 

 cl. clitcllum, imperfectly developed in this specimen. 

 ■ audal / 



