208 TuRRIfELLA. 



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



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

 three to live 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- 

 on3 r ms. In the Arctic regions the species attains double the 

 above dimensions. 



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

 65, figs. 24-26. 



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

 with three to five spiral striae, and longitudinal folds ; yellowish 

 brown. Length, 17 mill. 



Maine to Greenland, Alaska. 



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

 (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. 



Yar. 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. DELICIOSA, 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, Dall. Yucatan Strait, 640 fms. 



T. FULMINATA, T. viTTATA, Button. New Zealand. 



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



Pt. Jackson, Australia. 

 T. AURBOCINCTA, Martens. Friendly Islands. 



