236 DR JOHNSTON'S DESCRIPTIVE CATALOGUE or THE 



said to have any spiral stria?, as they are merely undulations of the ribs, 

 which nearly disappear in the hollows, and on the left side of the ribs, 

 the latter lying over in that direction. The striae of F. muricatus nre 

 more distinct, numerous, and regular, particularly toward the base of the 

 shell. The outer lip of F. muricatus is strongly tuberculated within : 

 your Berwick shell is smooth in the specimen sent, which however is 

 young." I may add, that I have now examined six specimens, in all of 

 which the lips of the aperture are smooth, and two of the specimens at 

 least appeared to be full-grown. 



5. F. Turricula, shell white, turreted with eight gradually decreasing 

 whorls flattened at the sutures, crossed with many thickish 

 straight ribs, and spirally striated ; aperture oval, with a very 

 short wide canal. Length j^ths; breadth |^ths. Flem. Br. 

 Anini. p. 349. Murex Turricula, Mont. Test. Brit. 262. tab. 9. 

 iig. 1. 



Hb. Berwick Bay, very rare. 



There are fifteen ribs on the body -whorl, which disappear on the back of the 

 canal. The whorls nre flattened, and rise perpendicularly from each other, 

 becoming suddenly plane on the top, the ribs being continued across this 

 flattened space. 



6. F. linearis, shell fusiform, ribbed transversely and crossed with 

 elevated striae nodulous on the ribs, the interstices smooth ; 

 whorls six or seven, convex, the ribs about ten, and the cross lines 

 eight on the body ; aperture oval, the beak shorter than its length, 

 straight, the outer lip thickened, the pillar plain. Length ^ths. 

 Flem. Brit. Anim. 350. Murex linearis, Mont. Test. Brit. 261. 

 t. 9. fig. 4. 



I lib. Berwick Bay, in sand, not uncommon. 



Our specimens are dead shells, procured from among sea-sand. They are 



whitish, with a purplish apex, and marked spirally with reddish-brown 



lines, for the spiral stria? are of this colour. 



7. F. costatus, shell fusiform, slender, of a yellowish-brown colour, 

 smooth ; whorls six, transversely ribbed, the ribs nine on the 

 body, slightly waved, obtuse, continuous ; aperture oval, with a 

 short wide canal and plain lips. Length ^ths ; breadth ,' () (li. 

 Flem. Brit. Anim. 349. Murex costatus, Mont. Test. Brit. 265. 



llab. In shell sand, very rare. 



The apical or primary whorls are not ribbed. The shell is very smooth, and 

 somewhat glossy. 



8. F. nebula. Mont. Test. Brit. 267, pi. 15, fig. 6. F.pyramidatus. 

 Brown's Conchology, pi. 48, fig. 19, 20. 



Hull. Coldin^lmm Bay, Mr Robert Madaurin. " Found bv me at St Abb's 

 Head," Brown. 



Mr Maclaren's specimen is an old and worn one, nine lines in length, and three 

 in diameter where broadest, of a dull brownish colour, stained witli ex- 

 traneous matter, opake and thickish, and appears to have been coated with 

 a yellowish-brown epidermis, minutely reticulated in its fivsh condition. 

 The description must consequently bo imperfect. Shell turreted, with 

 nine ribbed whorls tapering gradually to a point : whorls very slightly 



