F. M. TnrnbuU — Anatomi/ and Habits of Nereis virens. 279 



Fig- 8. — Fortj'^-fifth lateral appendage of female, posterior view; A. upper ramus; B, 

 lower ramus; a, dorsal cirrus; &, superior ligula of upper ramus; c, anterior 

 setigerous lobe : /c, posterior setigerous lobe ; d, inferior ligula of upper ramus ; 

 e, e,' divisions of anterior setigerous lobe of lower ramus ; /; posterior setigerous 

 lobe; f/, inferior ligula; h, ventral cirrus; i, shoulder of upper ramus; s, s', sets ; 

 y, y', aciculEe. 



Fig. 9. — One hundred and nintli lateral appendage of female, posterior view ; lettering 

 the same as in fig. 8. 



Fig. 10. — First lateral appendage of male, posterior view; lettering the same as in 

 fig. 8. 



Fig. 11.— Fifth lateral appendage of male, posterior view; lettering the same as in 

 fig. 8. 



Fig. 12. — Forty-fifth lateral appendage of male, posterior view; '•■, extra division of 

 anterior setigerous lobe ; x, shoulder, peculiar to the male, on the dorsal edge of 

 the lower ramus ; otherwise the lettering is the same as in fig. 8. 



Fig. 13. — One hundred and ninth lateral appendage of male, posterior view; lettering 

 the same as in fig 8. 



Plate XLIII. 



Fig. 15. — Nereis virens; ventral view of the head and mouth, the proboscis withdrawn; 

 '7, head ; b, h, antennae ; c, c, palpi ; c', c', lobes of palpi ; d, buccal ring ; ee', ee', 

 shorter dorsal pair of tentacular cirri ; e, e, longer ventral pair of tentacular cirri ; 

 e,' e,' shorter ventral pair of tentacular cirri ; ?n, mouth ; g, abdominal rings ; h, h, 

 lateral appendages. 



Fig. 1 fi. — Nereis virens; the walls of the body are cut through longitudinally on the dorsal 

 side, so as to show the perivisceral cavity with the alimentary canal; m, mouth; 

 «, muscles of mouth ; x, pharyngeal region of the proboscis ; c, muscular partitions 

 of proboscis; 6, perivisceral cavity: p, dental region of proboscis; o, oesopha- 

 geal region of proboscis ; j. salivary glands ; r, intestine proper ; a, muscular 

 partitions. 



Fig. 17.— Head of Nereis virens, with the proboscis protruded, dorsal view; a, head; 

 b, b, antennae ; c, c, palpi ; c', c', lobes of palpi ; d, buccal ring ; ee, longer dorsal 

 pair of tentacular cirri ; ee', ee', shorter dorsal pair of tentacular cirri ; e, e, longer 

 ventral pair of tentacular cirri ; e', e', shorter ventral pair of tentacular cirri ; /, /, 

 jaws; 0, anterior median area of dorsal side; I, I', left and right anterior sub- 

 median areas of dorsal side ; w, «', anterior lateral areas ; i, posterior median area 

 of dorsal side ; s, s', left and right posterior sub-median areas of dorsal side ; ?•, 

 posterior lateral and ventral areas. 



Fig. 18. — Protruded proboscis, ventral side; /, /, jaws; w, w', anterior lateral areas; 

 y. anterior median area of ventral side ; x, %', left and right anterior sub-median 

 areas of ventral side ; r, posterior lateral and ventral areas. 



Fig. 19. — Jaw of Nereis virens, much enlarged. 



Figs. 27 and 28. — Nervous system o( Nereis virens ; h, abdominal ganglia; 7i, n, nerves 

 to muscular partitions ; o, o, nerves passing through partition to preceding segment ; 

 TO, m, nervous trunlcs to feet ; k, k, ganglia sending off a cutaneous branch and a 

 branch (i) supplying nerves to tlie feet ; d, d, connectives ; d', d', accessory connect- 

 ives ; g, g, nerves communicating with the ganglia of the proboscis ; e, e, ganglia 

 sending branches to the internal or ventral tentacular cirri ; e', e', ganglia sending 



