208 TURRITELLA. 



T. EROSA, Couth, ri. G4,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- 

 on^^ms. In the Arctic regions the species attains double tlie 

 above dimensions. 



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

 65, figs. 24-26. 



More slender than the preceding form ; whorls 11-12, 1'ounded, 

 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, Moller 

 (fig. 25), T. lacteola, Carp., and 1\ 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 ma}^ be the case ; yet I can readil}" 

 distinguish the two species among the numerous specimens 

 before me. 



Yar. DECLivis, Aurivillius. Fig. 19. 



Shell without sculpture, Length, 2 r5 mill. 



Unfigured, Undetermined and Spurious Species. 



T. RUNCiNATA, T. AccisA, T. Carlott^, T. Cordismei, T. LAMEL- 

 LOSA, Watson. -S. U. 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. =Tur^boniUa. 



T. pusiLLA, Jeffreys. Not a Turritella. 



T. YucATANUM, Dall. 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. 



