208 TURRITELLA. 



T. EROSA, Couth. PL 64, figs. 13, 14. 



Whorls 9-11, rather flat, sloping towards the suture, with from 

 three to five narrow revolving grooves, apex generally eroded; 

 yellowish brown. Length, 12'5 mill. 



Massachusetts to Greenland, Alaska. 



T. polaris. Beck, and T. Eschrichtii, Midd. (fig. 14), are syn- 

 onyms. In the Arctic regions the species attains double the 

 above dimensions. 



T. RETICULATA, Mighels and Adams. PI. 64, figs. 15, 19; PI. 

 65, figs. 24-26. 



More slender than the preceding form ; whorls 11-12, rounded, 

 with three to five spiral stria?, and longitudinal folds ; yellowish 

 brown. Length, 17 mill. 



Maine to Greenland, Alaska. 



T. costulata, Mighels and Adams (fig. 24), M. lactea, Moller 

 (fig. 25), T. lacteola, Carp., and T. erosa, var. costata, Aurivil- 

 lius (fig. 26), are synonyms. The latter author appears to con- 

 sider the present species identical with T. erosa: as Arctic 

 shells are very variable, this may be the case ; yet I can readily 

 distinguish the two species among the numerous specimens 

 before me. 



Var. DECLIVIS, Aurivillius. Fig. 19. 



Shell without sculpture, Length, 27*5 mill. 



Unfigured, Undetermined and Spurious Species. 



T. RUNCINATA, T. ACCISA, T. CARLOTT^E, T. CORDISMEI, T. LAMEL- 



LOSA, Watson. S. E. Australia. 



T. ADMIRABILIS, Watson. Admiralty Islands. 



T. DELTCIOSA, Watson. N. Australia. 



T. AUSTRINA, Watson. Kerguelen Isl. 



T. PHILIPPENSIS, Watson. Pt. Philip, Australia. 



T. AREOLATA, Stimpson. =Turbonilla. 



T. PUSILLA, Jeffreys. Not a Turritella. 



T. YUCATANUM, Dull. Yucatan Strait, 640 fms. 



T. FULMINATA, T. viTTATA, Hutton. New Zealand. 



T. SOPHI^E, Brazier (T. incisa, Woods, not Reeve). 



Pt. Jackson, Australia. 

 T. AURBOCINCTA, Martens. Friendly Islands. 



