204 JOURNAL OF CONCHOLOGY, VOL. 1 3, NO. 7, JULY, I9II. 



Tlie young differs from that of Murex erinaceus, which it much 

 resembles, in being more slender, the mouth more contracted, and 

 the canal longer. 



T. barvicensis Johnst. — This and the last species vary consider- 

 ably in their sculpture, both of spirals and longitudinals, and some- 

 times approximate to each other in that respect, but each retains 

 its own family resemblance. Specimens from the Doggerbank and 

 Aberdeenshire are nearly an inch in length. Jeffreys' figure is a good 

 one, but exaggerated. 



T. truncatus Strom. — Between tide-marks in Antrim (Jeffreys) ; 

 Bull Bay, N. Wales (Archer). The limit of the distribution of this 

 species on our coasts is problematical. The Rev. J. Smart obtained a 

 dead and worn specimen at Scilly, and I have several young specimens 

 from the same district. I have also found it as a sub-fossil in a 

 raised beach on the Thatcher Rock, off Torquay. The record 

 " Poole" ^ was an error of identification. 



var. alba Jeff.— Uoggerbank 3of , off lona 2of., Aberdeenshire, 

 var. scalaris Jeff. — Soay Isles, lona (Somerville) ! the Minch 

 off Barra 35 f 



An Aberdeenshire specimen in my collection is an inch in length. 

 A very pretty variety from Skye has a purple ground with white ribs. 

 The shell is variable in convexity of whorls, comparative length to 

 breadth, and especially in the number of ribs; an adult from Skye has 

 15 ribs, while its fellow has 20. 



T. clathratiis L., which differs from the preceding in size only — 

 and is in fact the type of the species, our shell being only the 

 southern variety — is equally variable. Glacial specimens of it, with 

 its var. gunneri (analogous to our T. triaicalus and var. scalaris) are 

 occasionally obtained in the Hebrides, Orkneys, and Shetlands, and 

 tliough some of them look remarkably fresh, I have never met with 

 an undoubted recent specimen. 



Sowerby's figures of T. truncatus and var. scalaris (not scalariformis 

 as printed) are incorrect ; the type has no spiral ribs as there 

 indicated, and the variety represents a worn specimen of the type. 

 Excellent figures of var. gunneri will be found in Sars' work," and 

 of var. scalaris in Searles Wood's." 



FuSUS Brug. — Those interested in the nomenclature of this genus 

 should read Mr. Edgar Smith's notes on the " Nomenclature of Cer 

 tain Genera,"^ which have been elaborated and exhaustively worked 



1 Cooper, Jourii. Conch., 1894, vol. vii., p. 435. 



2 RIoll. Reg. Arcl. Norv., tab. .xv. figs. 11, iia. 



3' Ci-ag Moll., vol. iii., tab. iii., fisjs. iS a b (as var. gunneri). 

 4 Journ. Conch., 1901, vol. vi., p. 331. i 



