0)1 an Australian Land jSemertine. M7 



C. Desciuftion of Plates. 



Geonemertes austraHensis. 



Plate VII. 



Fig. 1. — Living specimen with the probo.scis everted. 

 Doi-.sal surface. Painted i'roni life. X 2!. 



Figs. 2-7). — Selected from a series of vertical longitudinal 

 sections through the anterior end (stained with 

 borax carmine.) All from (me and the same 

 side of the middle line, Fig. 2 being neaiest to 

 the outside and Fig. 5 nearest to middle line, to 

 show the brain, lateral (irgans, eyes, &c. In 

 Fig. 4, which passes througli about the middle 

 of one-half of the brain., that portion of the 

 cephalic pit which is not actually visible in the 

 section is re))resented by a red dotted line. The 

 muscular diaphragm is shown in all the figures 

 and sufficient of the longitudinal muscle sheath 

 to show its connection with the latter. All 

 drawn under Zeiss A, oc. 2, camera outline. 

 al. c. Alimentary canal. 



c. p Cephalic pit. 



d. g. Dorsal lobe of cerebral ganglion. 



e. Eye. 



ep. Epidermis. 



cjr. Groove in which openings of cephalic pits lie. 



I. g. Ganglion of lateral organ. 



L. m. Layer of longitudinal muscles. 



1/ m.' Forward continuation of longitudinal muscle 



layer in front of the muscular diaphragm. 



(P(H-tion only shown). 



vi. d. Muscular diaphragm, 



m. V. Median vessel. 



7L. Nerves coming off from cerebral ganglion, 



u. c. Lateral nerve cord. 



p. s. Proboscis sheath. 



sac. Sac of lateral organ. 



V. g. Ventral lobe of cerebi'al ganglion. 



X. Glsophageal organ. 



