34 R. C. Punnett. [No. 2 



Plate I. 



Eunemertes norclgaarcli, Section through the precerebral 



region, x 30. 



Cerebratulus longifissus, Section through the opening of 



the excretory system, x 12. 



Eunemertes norclgaarcU, anterior end seen (a) from the 



side, & (b) from the dorsal side, x 2. 



Linens niveus, Section through the level of the excretory 



duct, x 45. 



Cerebratulus longifissus, Section through skin in oesopha- 



geal region, x 



Cerebratulus norvegicus, Section through skin in oeso- 



phageal region, x 



Linens niveus, Section through skin in anterior intestinal 



region, x 



8. Micrura bergenicola, Section through skin in oesophageal 

 region, x 



9. Amphiporus pusillus, Outline sketch of living specimen 

 x 2. 



10. Amphiporus pusillus, Anterior end shewing the disposition 

 of the eyes, x 8. 



10 a. Carinella ambigua, Outline sketch from living specimen 

 shewing position of the two pale transverse markings. 

 Slightly enlarged. 



11. Amphiporus pusillus, Central stylets and basis, x 45. 



12. Amphiporus pusillus, Section through region of brain and 

 cerebral organ, x 60. 



13. Carinella ambigua, Section through intestinal region, 

 x 45. 



14. Micrura bergenicola, Section through cerebral organ. 

 x 45. 



15. Cerebratulus longifissus, view of anterior extremity. x */ 2 . 



Fig. 



1. 



)) 



2. 



55 



3. 



» 



4. 



55 



5. 



» 



6. 





7. 



