GASTEROPODA. 67 



aperture ovate, slightly acuminated at the base ; left lip reflected, with a small open 

 umbilicus, and three very minute folds upon the columella. 



Axis, yq of an inch. 



Locality. Cor. Crag, Sutton. 



But a few specimens of this species have come into my possession. It appears 

 to be distinct from the preceding one in the angular form of volution, and in 

 being more elongated, with a slight inflection of the outer lip at the angle of the 

 volution. In all my numerous specimens of C. costellifera there are none presenting 

 the angular form of volution so distinct in this shell ; it is nevertheless possible it 

 may be only a variety of that species. 



Two worn specimens from the Red Crag, in my cabinet, much resemble the 

 C. laviuscula of ' Min. Conch.;' they are in a mutilated condition, and may probably 

 have been introduced from the London clay. 



Teichoteop[S, Broderip and G. B. Sowerby. 1829. 

 Trichophere. Desk. 1830. 

 Trichopodus. Sivains. 1840. 



Gen. Char. Shell turbinated or subfusiform, with spiral ridges or carinas upon 

 the volutions, generally thin ; spire more or less elevated, with an acute apex ; 

 aperture subovate, acuminated at the base ; columella obliquely truncate and 

 flattened, with an open umbilicus. In a recent state it is covered with an epidermis, 

 and has a corneous operculum, with a lateral nucleus. 



A few species only of this genus are yet known, and those are boreal forms. 

 The name was given from the hairy keels (6pi£„ rpiKoc, hair, and t^ottiq, keel) which 

 surround the species, forming the type of the genus. The animal is said to resemble 

 in many of its characters that of the genus Buccinum, connecting it with Cancellaria ; 

 the shell, however, differs from the latter in having a form of aperture like that of 

 Purpura, with a flattened columella, and also in the absence of oblique folds. 



1. Trichotropis borealis. Brod. and Sow. Tab. VII, fig. 17, a — b, and 



Tab. XIX, fig. 11, a— b. 



TiuciiOTROPis borealis. Brod. and Soiu. Zool. Journal, 1829, vol. iv, p. 3/5. 



— Gould. Inv. of Massach. p. 300, 1841. 



Trichotropis acuminata. Jeffreys. MS. 



costellatus. Couthouy. Bost. Journ. Nat. Hist. vol. ii, p. 108, pi. 3, fig. 2. 

 Fusus tjmbilicatus. Smith. Mem. of AVern. Nat. Hist. Soc. vol. viii, p. 50, pi. 1, fig. 2, 1838. 



Tr. Testa ovato-fusiformi ; spird elevatd, apice acuminato ; anfractibus sex, convexis, 

 cinyulatis, superne plamusculis ; lonyitudinaliter tenuissime striatis ; aperturd ovatd, sub- 

 canaliculatd ; labio cotnplanato ; umbilico prof undo. 



Shell ovato-fusiform, with six deeply defined volutions, and an elevated spire ; 

 whorls rather flattened above, ornamented with four or five elevated transverse, 



