(>!(> Mil. E. R. LANKESTER ON SOME LOWER ANNELIDS. 



I 13. Lateral view of the anterior portion of Ch. Vnnnm. n.p?*, nerves passing to the prostomal region; 



d. contractile dorsal vessel ; b.ph, pharyngeal bulb, between pharynx and oesophagus; gr, 

 granules adhering to the dorsal vessel, and also free; other letters as in fig. 12. The commis- 

 sural \sscl of one side on.lv is drawn. 



Plate XLIX. 



1 II. Doi d view of the anterior portion of Ch. limmei; oes, oesophagus ; other letters as before. 



I I 15 n-,tle from an abdominal bundle of Chcetog aster limnm. The space between the two hooks 



of the head in the engraving is too great, and the head is too large in proportion to the shaft. 



The direction of the hooks, however, is correct. 



I KJ. Bristle from an abdominal bundle of Chatogaster diaphanus, Gruithuisen. This is a lar^e 



spent s, attaining nearly an inch in length. Compare fig. 11. 

 Fig. 17. Sketch to show the longitudinal markings on the pharynx, looking like vessels, but probably 



due to plications caused by contraction. 



Fig. IS. Do. of horizontal vessel-like appearances on the dorsal surface. The questionable vessels 



branching from around tlu> mouth are also drawn. 

 I i 19, 20, 2\ , 22. Different positions of the mouth and walls of the pharynx in ingulfing food. 

 Figs. 28, 21. Appearances like vessels in the skin, probably produced by the plication of the integument. 



meous structureless substance. No distinct nerves traceable to 



terminations j * s, spaces or growings in the middle line, irregular in distribution, and not alwavs 



pr< lit. 

 aggregation ( 



fe *anules, <, »uu^ g 



in (vll-tonns; ,/, nucleated corpuscles; /, pyriform corpuscles; g y kidney-cell of Limnteus, 



swallowed by Ch. limnm. 



urface 



icid. (Tliis drawii 



arynx 



Fig. 29. Segment 



The 



only one of its terminations (that by which it communicates with the exterior) can be traced. 

 I here are no cilia. 



igs. 30 



the parent. 



growth and the new segments 



!■;: J ( '!" i ;:r"";" C "" S ?' ""' I';:;'*™" ° f thc "**-**. -* % clear cells intended. 



l i<r. >. v ellular termnuihnn c\{ nUn- f*~ i-~ »* - 



wall 



from 



( 'hatogaste* 



rg< i hexagi 



integrum ent 



I :. 36. Two of the same, free, one showing cilia. 



I 'art of the stomach 

 LIUlcr surface. 



g the 



