26o MARSHALL: ADDITIONS TO 'BRITISH CONCHOLOGY.' 



C. metaxae var. alba Marsh. Milk white. Guernsey, 20 

 fathoms ; Scilly, 40 fathoms. 



In the 'Lightning' Report Jeffreys mentions a needle-shaped 

 variety from the Bay of Naples, which is 'slender and narrow,' 

 and another which is milk-white. According to Monterosato, 

 the former is var. afigustissima Forbes = benoitlana Monte. 

 Both these forms are now added to the British List. The Scilly 

 Islands abound in varied forms of the Cerithiopsidse. 



In reading Jeffreys' detailed description of C. metaxoe, it 

 should be noted that the species consists of two forms— the one 

 which he describes, having four rows of tubercles on each whorl, 

 these whorls convex and rounded, with a very deep suture ; in 

 the other, the whorls have three rows of tubercles only, the 

 fourth row fitting into and filling up the otherwise deep and 

 wide suture, and so entirely altering the aspect of the shell. I 

 am surprised Jeffreys did not notice this very characteristic 

 difference, which should have a varietal name. In about thirty 

 specimens from the Channel and Scilly Islands the two forms 

 are about equally divided. 



Purpura lapillus var. ovalis Jordan. Spire short and de- 

 pressed ; body-whorl globular; sculpture obsolete. Length, 

 I ; breadth, 075. Found at Paignton, S. Devon. Some 

 specimens are almost as broad as long. 

 P. lapillus var. gracilis Jordan. — Spire much longer; body- 

 whorl smaller and narrower ; aperture not thickened, nor 

 provided with the usual plications or tubercles ; suture very 

 deep ; sculpture coarse. Length, i'5 ; breadth, 075. From 

 Burnham, Somerset. This is like a small and elongate 

 form of the var. major. 

 Cassldaria echinophora L. Two fine live specimens of 

 this species were dredged off the S.W. of Ireland in 1886, 

 in 220 fathoms, and about forty miles from land, by a party 

 of members of the Royal Dublin Society. One of the 

 specimens was presented by the latter body to the British 

 Museum, and the other is in the Dublin Museum. 



J.C., vii., Oct. 1893. 



