TRICIIOTROPIS. 



Thes. PI. 285. 



Fig. 

 1, 2, 8. borealis, 1, Broil. Sf Sowb. Zool. Journ. iv. p. 375. — 

 T. Atlantica, (p. 2) Beek. T. umbilicata, Macg. T. 

 acuminata, Jeffreys. Behring's Straits; Greenland; 

 N. Britain. 

 4, 5. Cedo-nulli, 7, A. Adams. Japan. 



6. costellata, 6, Couthou/j. N. America. 

 7, S. btcakinata, 11, Brod. Sf Sowb. Japan. 



9. insignis, 10, Middendorf, Malac. Ross. p. 107. t. 10. 

 f. 7, 8, 9. Behring's Straits. 



10. unicarinata, 12, Brod. Sf Sowb. Zool. Journ. iv.p. 376. 



Japan. 



11. flavidula, 5, Hinds, Toy. Sulph. — T. clatlirata, A. Ad. ? 



Sitka, N.W. America. 



12. cancellata, 6, Hinds, Pro. Zool. Soc. 1843. Sitka, 



N.W. America. 



13. Kuzeri, 4, Philippi, Menke Zeitschr. 184S. — T. Dolium, 



Pe^V, Journ. Conch, ii. /;£ 21 .f. 4. T. ciliata, Kuzer. 

 Spitzbergen. 



14. inermis, 3, Hinds, Voy. SuljpA.pl. ii./. 13, 14. Sitka, 



N.W. America. 

 15, 16. quadricarinata, 8, A. Ad. Japan. 

 17. conica, 9, Mull. Greenland. 



