ALVANIA TEXTILIFORMIS. 617 



Sprcijir Characters. — Shell minute, pyramidal, rather thick ; whorls 6, the last 

 much the largest, nearly two-thirds the total length ; ornamented by numerous 

 very fine ribs> nearly straight, which do not reach the base; the labial rib is thickened, 

 crossed by closely-set spiral stri;e, much less prominent than the ribs, except near 

 the base, where they are Avell uiarked, the lowest forming a strong ridge enclosing 

 a basal groove ; the two first whorls smooth; spire rather short, pointed; suture 

 distinct; mouth oval, obscurely notched inside; outer lip thin; incurved inner lip 

 folded back, adhering to the pillar, continuous with the outer one ; behind the 

 pillar, as stated above, there is a rather deep and narrow groove. 



Dimensions. — L. 3"5 mm. B. 2 mm. 



Distribution. — Not known living. 

 Fossil : Bridlington. 



Bemorlis. — The specimen now given is from Mr. Headley's Collection, and is 

 the one originally figured by Jeffreys and bears his writing. He states it is the 

 only species, living or fossil, known to him which possesses the basal groove 

 referred to. 



Alvania textiliformis, A. Bell, MS. Plate LI, figs. 20, 21. 



8'pecific Characters.- — Shell minute, ovato-conical ; whorls 5 or 6, slightly 

 convex, the last tumid, much the largest, three-fourths the total length ; ornamented 

 by numerous exceedingly fine and delicate closely set longitudinal ril^s, hardly 

 reaching the base of the shell, clathrated by equally fine and inconspicuous spiral 

 lines which are continuous and stronger towards the lower end; suture clearly 

 marked, but not deep ; spire short, conical, regularly diminishing towards the 

 apex; mouth ovate to subcircular, about half the total length, angulate above, 

 rounded below, sometimes a little expanded. 



Dimensions. — L. 2 — 2"5 mm. B. 1 mm. 



Distribution. — Not known living. 

 Fossil : St. Erth. 



Breviaries. — These two charming and delicately sculptured shells belonging to 

 the AVarburton Collection, now figured under Mr. Bell's MS. name, were obtained 

 by him many years ago, but have since remained unnoticed at the British 

 Museum. They might almost be regarded as specifically distinct, differing as they 

 do considerably in form, but although the sculpture of one of them is less cleai-ly 

 marked than that of the other, it may be seen, under a microscope, to be so nearly 

 the same that I prefer to regard them as varieties of one species. 



Alvania reticulata (Montagu). Plate L, fig. 45. 



1807. Turbo reticulatus, Montagu, Test. Brit., pt. ii, p. 322, pi. xxi, tig. 1. 



1853. Eissoa Beauii, Forbes aud Hanley, Brit. Moll., vol. iii, p. 84, pi. Ixxix, figs. 5, 6. 



