Mr. E. A. Smith on new Species o/^ Terebridae. 263 



it (Thes. Conch, fig. 97), which shows clearly the chief di- 

 stinctive feature of the species, namely the wavy spiral sulcus 

 or impressed line which divides the whorls a little below the 

 suture. 



T. inconstans, Hinds, I. c. fig. 83 (Reeve, I. c. fig. 121, h, 

 typical, c, var.), is recognized, in the first place, by its shorter 

 and broader form, then by the greater coarseness of the ribs or 

 plications, which are produced to the base of the whorls, and 

 lastly, but especially, by the presence of a thick callosity or 

 plication situated on the middle of the columella, rather far 

 within the aperture. 



T. matheroniana^ Desh., is a small species, of a very distinct 

 character. The longitudinal plications are continuous to the 

 base of the whorls ; and the aperture is small and narrow, and 

 not patulate as in aciculina. 



Terehra pulchra^ Hinds. 



The type of this species, presented to the British Museum 

 by Sir E. Belcher, on comparison with cerithina^ Lamk., 

 proves to be but the early stage of that form. 



Subgenus nov, Impages. 



Testa subulata, terebraeformis ; anfract. integri, plus miuusve 

 longitudinaliter striati vel plicati, sutura iudistincta scparati ; 

 callo augusto Hneam suturalem supra cincti. 



The term Leiodomus was applied by Swainson in 1840 to 

 some of the species composing the genus Bullia of Gray (1835). 

 It is resti-icted by Messrs. H. & A. Adams, in their ^Genera of 

 Recent Mollusca' (i. p. 114), to one of the species quoted by 

 Swainson, viz. vittata (Linn.), and three or four others unknown 

 to that author. 



Dr. Gray, in the ' Guide to the Systematic Distribution of 

 Mollusca in the British Museum' (p. 6), applies this name to 

 those species of Terebridse which have a callous band encircling 

 the whorls above, but contiguous to the sutm-al line, quoting 

 T. ccerulescens [var. =nimhosa^ Hinds] as an example. The 

 other species which possess this peculiarity are micans, Hinds 

 (var. Adansom, Desh.), acuminata, Gray, cusjndata, Hinds, 

 apicina, Desh., Traillii, Desh., bacillus , Desh. 



As I deem it advisable to leave the group Leiodomus as a 

 subgenus of Bullia, as disposed by Messrs. Adams, I would 

 propose to apply the subgeneric title Impages to the above- 

 named species. 



Terehra jlava, Gray. 



The specimen from wliich the figure of this species in the 



