KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 63. N:0 2. 61 



Explanation of plates. 



Plate 1. 



Fig. 1. Styela rustica Linné, from Spitzbergen, somewhat magnified. 

 » 2. The same, from the Kola Peninsula, natural size. 

 » 3. Styela loveni Särs, from the Kola Peninsula, X ly. 

 » 4. The same, from Spitzbergen, natural size. 

 » 5. Styela theeli n. sp. X 14. 



» 6. The same. Dorsal tubercle and part of dorsal lamina. X 10. 

 » 7. The same. Left side of body. X2. 



at. Atrial aperture; br. Branchial aperture; i. Intestine; /•. Rectum; s. Stomach. 

 » 8. The same. Right gonads. X 6. 



e. Endocarp; od. Oviduct; ov. Ovary; t. Testis; vd. Vas deferens. 

 » 9. The same. Part of left gonad. X 6. 



ov. Ovary; t. Testis; vd. Vas deferens. 

 » 10. Pelonaia corrugata Goodsir a. Forbes, from Iceland, natural size. 

 » 11. The same, from Spitzbergen, natural size. 

 » 12. The same, from Gullmarn, natural size. 

 » 13. The same. Gonad. XlJ. 



t. Testis; o. Ovary. 

 » 14. Ypsilocarpa clipeata gen. et sp. n. X 6. 

 » 15. The same. Gonad. X 6. 



od. Oviduct; vd. Vas deferens. 

 » 16. The same. Part of the intestine with rectum. X 6. 



r. Rectum 

 » 17. The same. Dorsal tubercle. X 33. 



» 18. Cnemidocarpa rhizopus Redikorzew, from Cape Grebeni. X 2. 

 » 19. The same. X 2. 

 » 20. The same. X 2. 

 » 21. Cnemidocarpa rhizopus var. murmanensis Redikorzew. X 4. 



Plate 2. 



Fig. 22. Cnemidocarpa rhizopus Redikorzew. Left side of body. The test is cut open and turned back to 



show the internal structure. X 4. 



bs. Branchial sac; c. Coecum: c. Endocarp; g. Gonad; r. Rectum; s. Stomach. 

 » 23. Cnemidocarpa mollispina n. sp. X 4. 

 » 24. The same. The test is cut open and turned back to show the internal structure. X 6. 



bs. Branchial sac; c. Coecum; e. Endocarp; g. Gonad; >\ Rectum; s. Stomach. 

 » 25. The same. Dorsal tubercle. X 35. 

 » 26. The same. Gonad. X 10. 



o. Ovary; /. Testis. 

 j> 27. Cnemidocarpa ärrat a n. sp., from Spitzbergen. X 3. 

 » 28. The same, from Greenland. X 3. 

 » 29. The same. The animal is cut open to show the gonads. X 5. 



a. Right side; b. Left side; g. Gonad. 

 » 30. The same. The alimentary canal. X 5. 



c. Coecum; r. Rectum; s. Stomach. 



K. Sv. Vet. Akad. Handl. Band 63. N:o 2. S* 



