226 MRS. JANE LONGSTAEE ON [May 1909, 



SxiLONEMA (?) HIBERNICUH, Sp. nOV. (PI. XI. fig. 8.) 



Diagnosis. — Shell small, conical, composed of more than six 

 whorls. Whorls smooth, flattened above, convex below, adpressed 

 at the suture. Lines of growth very fine, slightly curved. Sutures 

 rather oblique. Aperture unknown. 



Remarks and resemblances. — The holotype, which is the only 

 specimen known to me, is in the Museum of Practical Geology ; its 

 registered number is 21062, and it is associated with the specimen 

 described as Loxonema reecli. The finer and less sinuated lines 

 of growth, however, distinguish it from that species ; also there are 

 traces of a faint impressed submedian spiral line on the penultimate 

 and body-whorls. The lines of growth are much less strongly 

 curved than in the typical Loxonema : therefore I place it pro- 

 visionally in the subgenus Stylonema, Perner, though it is of much 

 smaller dimensions than is usual in that genus. It bears some 

 resemblance to Holojpella, M'Coy, but differs in having less convex 

 whorls and adpressed sutures. 



Dimensions. — The lengthof the holotype is 19 millimetres. The 

 shell is too much embedded in the matrix to ascertain the width. 



Locality and horizon. — Chair of Kildare, in limestone of 

 Upper Bala age (Cowper Reed). 



Stylonema (?) pkjgtebitttm, sp. nov. (PI. XI, fig. 9.) 



Diagnosis. — Shell of medium size, conical, composed of about 

 ten whorls. "Whorls broad, flattened at the suture, concave above 

 and very convex below. Sutures slightly inclined. Lines of growth 

 extremely fine and close together, curving but little backward above 

 and forward below. Base convex. Aperture unknown. 



Remarks and resemblances. — I refer this species to the 

 genus Stylonema, Perner, on account of the broad whorls, the small 

 obliquity of the sutures, and the slightly sinuated lines of growth. 

 I do so, however, with a query, for it bears considerable resemblance 

 to some members of Holojjelld, M'Coy, which genus differs from 

 Loxonema by having the aperture circular and entire. In the 

 absence of any knowledge of the form of the aperture of either this 

 or the last described species, we must remain in some uncertainty 

 as to the genus in which they should be placed. Stylonema (? ) 

 prceteritum is distinguished from Holopella tenuicincta, M'Coy, which 

 occurs at the same locality, by having a greater spiral angle, less 

 evenly convex whorls, and less oblique sutures. The whorls are 

 rather lower, and not so much flattened above as those of Stylo- 

 nema (?) Mbernicum. 



Dimensions. — Only one specimen is known to me. It is in 

 Mrs. Gray's collection, at Edinburgh. It is an external mould, and 

 therefore the drawing is made from a wax-impression. Length = 

 27 millimetres ; width =9*5 mm. 



Locality and horizon. — Mullock Hill (Ayrshire), in rocks 

 of Lower Llandovery age (Lapworth). 



