ODOSTOMIA. 159 



whorls has 2 similar ridges, representing the upper two of the 

 body-whorl ; all the ridges are crossed obliquely by sharp and 

 raised longitudinal ribs, which extend to the base and impart 

 a strongly and deeply cancellated appearance, the points of in- 

 tersection being nodulous or tubercular; of the longitudinal 

 ribs about 25 may be counted on the last whorl of a full-grown 

 individual ; the top whorl is smooth : colour white : spire 

 tapering to a bluntly rounded point ; nucleus somewhat ex- 

 centric, and twisted inwards: whorls 6, turreted, flattened 

 (except for the angularity caused by the excavated sculpture), 

 and gradually enlarging ; the last occupies rather more than 

 half the shell: suture broad and remarkably deep, slightly 

 oblique : mouth squarish-oval, not contracted above, expanded 

 and angulated below; length about one-third of the spire: 

 outer lip projecting, marked by four angular points, being the 

 terminations of the spiral ridges ; it is abruptly recurved on the 

 peripheral ridge : inner lip slight on the upper part, but united 

 with the outer lip, reflected and almost straight below T , where it 

 also joins the outer lip at a right angle : umbilicus narrow and 

 contracted, but distinct: tooth small and retired, although visible 

 in every specimen, and winding round the pillar. L.O15. B.O06. 



HABITAT : Coralline zone in Jersey (Dodd), Guernsey 

 (Metcalfe, Barlee, and J. G. J.), Falmouth (Hockin), 

 Fowey and Burrow Island (Barlee), Exmouth (Clark), 

 Miltown-Malbay, co. Clare (Harvey and Humphreys), 

 Turbot-bank, off Larne (Waller), Lamlash Bay, N.B. 

 (Landsborough, Bean, and Norman). Cailliaud has 

 taken it, among Corallina officinalis, in the Departement 

 of Loire-Inferieure, Gay at Toulon, Mace at Cannes and 

 Antibes, the Marquis J. Doria and myself at Spezzia, 

 von Schrockinger and Brusiiia in the Adriatic, Philippi 

 in Sicily, and Weinkauff at Algiers in 5-20 f. Mediter- 

 ranean specimens are much smaller than ours. 



Professor Harvey, the discoverer of this species on 

 our coasts, proposed to call it Cingula sculpta-, Mr. 

 Thompson of Belfast described it as Rissoa Harveyi ; 

 and in Mr. Hanley's ' British Marine Conchology' it 

 bears the name of Parthenia turrit a, Metcalfe, MS. 



