MARSHALL : ADDITIONS TO 'BRITISH CONCHOLOGY.' 263 



P. rufa var. ecostata Marsh. Colour ash-grey; spire shorter; 

 body-whorl longer and compressed ; ribs obsolete, except 

 just below the suture, which appears shallower in conse- 

 quence of the whorls being but slightly angulated. This 

 variety was dredged by the surveying ship 'Porcupine' in 

 the Lynn Deeps, on the Norfolk coast, in 40 fathoms, and 

 are in my collection. It is analogous to P. nebula vax.fiisi- 

 forme, which it resembles in several particulars. It also 

 approaches very closely to P. pyramidalis, a post-tertiary 

 fossil sometimes dredged in our seas; but that has fine and 

 regular spiral striae, while this is unequal and irregular. 



Cyprsea europaea var. minor Marsh. Shell very much 

 smaller, measuring 2 lines by i|. From deep water off 

 Guernsey ; west coast of Ireland ; Barra, 40 fathoms. 



C. umbilicata var. strigella Loven. Larger, with coarser 

 spiral striae. It is figured in Forbes and Hanley's work, 

 and in Sowerby's Index. I can verify this variety from 

 Stornoway only. Jeffreys' figures of C. umbilicata and C. 

 nitidula are misarranged. What he figures as C. Jiilidula 

 is C. umbilicata, and vice-versa, while the section showing 

 the spiral sculpture of C. umbilicata has been attached to 

 the figure of C. nitidula. This derangement is doubly 

 unfortunate, as these two species are rather difficult to 

 discriminate. 



Cylichna ovata Jeff. This was described in 'British Con- 

 chology' as C. umbilicata var. conulus S. Wood, but subse- 

 quently raised to a species under the above name. It differs 

 from C. umbilicata in being oval instead of oblong; it has 

 a wnder mouth, is longer, thinner, smoother, more glossy, 

 and the depression in the crown is wide and deep, exposing 

 the whole interior of the inverted spire. There is an ex- 

 cellent figure of it in the 'Challenger' Report. It is also 

 figured in Sowerby's Index as C. umbilicata var. conulus, 

 but this figure is a form of Utriculus iruncatubis, somewhat 

 resembling in shape C. striatula Forbes, with which C. 



