126 Descriptions of Preparations. 



of the body-walls are seen the remnants of the muscular dissepi- 

 ments which gave to the body and to the digestive tract their 

 annulate appearance. Near the line of the inner row of setae, 

 a little way exteriorly to which they ordinarily but not invariably 

 have their external outlet, are to be seen the ' segmental organs/ 

 which are muciparous glands forming complexly convoluted coils, 

 attached by a sort of mesenteric membrane to the muscular dis- 

 sepimental walls of the segments in which the greater part of 

 their length is lodged, and prolonged through the anterior wall 

 of this segment into the segment next in front, to end by ex- 

 panded and ciliated infundibula near the middle line and the 

 ventral surface. 



For a description and figure of the reproductive organs of the 

 Lumbricus Terrestris, see pi. viii. infra; and Hering, Zeit- 

 schrift fiir Wiss. Zool. viii., 1857, p. 400. See also D^Ukedem, 

 Memou'es Couronnes Acad. Belg,, 1856, tom. xxvii., p. 9 

 seqq. ; Mem. Acad. Roy. Belg., tom. xxxv., 1865, pi. ii., 

 figs. 2 and 3. 



For the ^ segmental organs/ see Gegenbaur, Zeitschrift fiir Wiss. 

 Zool. iv.j 1853, p. 221. See also a note by Hering, I. c. 

 p. 401, and for the homologies of these organs with the 

 efferent ducts of the reproductive glands, see Claparede, Re- 

 cherches Anatomiques sur les Annelides, Turbellaries, &c., 

 1861, p, 28; and Lankester, Journal Micr. Soc, 1865, p. 7. 



For the oesophageal glands, see Lankester, I. c, 1864, p. 265; and 

 D^Ukedem, Mem. Acad. Roy. Belg., tom. xxxv., pi. i. fig. 10, 

 p. 23. 



For the Perichaetous Worms, see D^Ukedem, l. c, pp. 30, 3 1 ; 

 Schmarda, Neue Wirbellose Thiere, 1861, i. i, p. 13. 



For the classification of the Annelids generally, see Grube, Die 

 Familien der Anneliden, 1851; Ehlers, Die Borstenwiirmer, 

 1864- 1 868, vol. i., pp. 52—57 ; Claparede, Annals and Maga- 

 zine of Natural History, Ser. iii., vol. xx., 1867, p. ;^;^'j. 



