Eglisia, Callostracum, Mesalia, d;c. 375 



with nine narrow turns, nearly flat." It is also characterised 

 by Gould as "horny, multispiral." 



Jeffrey [1. c. supra) has described the living animal and 

 also made some observations upon the composition of the 

 shell and its liability to corrosion. He described the oper- 

 culum as " round and multispiral, with the nucleus in the 

 centre ; the edges of the whorls overlap, as in T. terehra.^^ 



I cannot, judging from Middendorff's description of 

 T. eschrichtii, agree with Tryon {I. c. supra) that it is synony- 

 mous with the present species. 



Tachyrhynchus eschrichtii (Middendorff). 

 1849. Turritella eschrichtii, MiddendortF, Malac. Eoss. p. 68, pi. xi. 



1886. Turritella {Turritellopsts) erosa (partim), Tryon, Man. Conch, 

 vol. viii. p. 208, pi. Ixiv. fig. 14 (after Middendorff). 



Hab. Sitka, Alaska {Middendorff). 



This species is closely allied to erosa, but the whorls are 

 ?aid to be flatter, and apparently higher, since, if viewed 

 dorsall}^, the last whorl, it is stated, equals almost one-third 

 of the whole length of the shell, whereas in erosa it equals 

 only one-fourth. The base of the body-whorl in the latter 

 is almost flat and circumscribed by a distinct angle. In 

 eschrichtii, on the contrary, the peripliery and base are 

 rounded. The aperture is longer and oval, whilst in erosa it 

 is shorter and rounder. Animal and operculum unknown. 



Tachyrhynchus reticulata (Mighels & Adams). 



1842 (January). Turritella reticulata, Migliels & Adams, Boston Journ. 



Nat. Hist. vol. iv. p. 50, pi. iv. fig. 19. 

 1842. Turritella lactea, Muller, Index Moll. Greenland, p. 9, 

 1849. Mesalia lactea : Reeve, Conch, icon. vol. v. pi. i. fig. 1 (enlarged). 

 1857. Turritella reticulata : Morch, Rink's Gronland, vol. ii., Naturhist. 



Bidrag, p. b2. 

 1861. Turritella lactea : Troschel, Gebiss der Schnecken, vol. i. p. 15.3, 



pi. xii. figs. 13-13 6. 

 1868. Tachyrhynchus reticulata : Morch, Amer. Journ, Conch, vol. iv, 



p. 46, animal. 



1870. Turritella reticulata : Gould, Invert. Massachusetts, ed. 2, p. 318, 

 fig. 586. 



1871. Mesalia reticulata: Dall, Amer. Journ. Conch, vol. vii. p. 118. 

 1877. Turritella reticulata : Jeffreys, Ann. & Mag. Nat. Hist, vol, xix. 



p, 240. 

 1886. Turritella ( Turritellopsis) reticulata : Tryon, Man. Conch, vol. viii, 



p. 208, pi. Ixv. fig. 25, after Reeve. 

 1897. Turritellopsis reticulata : Kobelt, Conch, Cab., Turritella, p. 69, 



pi. XX. figs. 16, 17. 



Ilab. Gulf of St. Lawrence {M. & Ad.) ; Labrador and 

 E. Canada {Bush <i' Whiteaves) ; Greenland {MdHer). 



25* 



