PATAGONIAN EXPEDITIONS : ZOOLOGY. 



EXPLANATION OF PLATE XLIX. 



PACK 



Fig. i . SEMISCOLEX VARIABILIS : Dorsal view of one of the larger specimens, 



XI ... 670 



Fig. 2. " " Dorsal view of twelve anterior somites, same 



specimen, X T^ 



Fig. 3. " " Ventral view of same, X T 5 -- Figs. 2 and 



3 are somewhat diagrammatic 



Fig. 4. " " Ventral view of anterior thirteen somites of 



a young example, accurately drawn to 

 show the relative development of the 

 annuli and position of the ganglia, X -j 8 -. 



Fig. 5. " " Dorsal view of posterior end of specimen 



shown in Fig. i, X T 5 - 



Fig. 6. " " Ventral view of same, X T^ 



Fig. 7. " " Lateral aspect of anterior end of same, XT^- 



Fig. 8. " " Lateral aspect of posterior end of same, XT^- 



Fig. 9. " " A somewhat diagrammatic outline, showing 



the chief peculiarities of the alimentary 

 canal, X about -^ 672 



Fig. 10. GLOSSIPHONIA DUPLICATA : Reproductive organs dissected and viewed 



from above ; surface texture of testes 

 shown on left side, X ^ 678 



Fig. n. GLOSSIPHONIA SIMPLEX: General features of alimentary canal, dorsal 



view, X -" 68 1 



LETTERING : a, anus ; at, atrium (penis sheath or prostate cornua) ; de, ductus 

 ejaculatorius ; ep, epididymis ; gan, ganglion, the neuromere indicated by a Roman 

 numeral ; gc, gastric caeca ; ga } glandula albuginea ; u, intestinal caeca ; m, mouth ; 

 n, nephropore ; ode, common oviduct ; ov, ovary ; ph, pharynx ; phg, pharyngeal 

 glands ; pg, prostate glands ; /, testes, the serial number of which is indicated by a 

 numeral ; va, vagina ; vd, vas deferens. The somites are numbered with the usual 

 Roman characters, the annuli with their symbols. 



(VOL. in) 



