KOKENOSI^IRA MACCULLOCHT. :37 



5. Kokenospira lingualis, var. girvanensis, nov. Plate VII, tigs, o — 8. 



1877. Bellerophon cf. subdecussatus, McCoy, Etlieridge, Proc. Koy. Phjs. Soc. Ediub., vol. iv, p. 175, 

 pi. ii, figs. 9, 10. 



Specific Characters. — Shell subglobose, of o — 4 whorls rather closely enrolled. 

 Umbilicus deep, about two-fifths to oue-half the diameter of the shell. 

 Whorls transverse, wider than high, subreniform in section, increasing slowly in 

 width and height. Outer whorl emljracing about half of preceding one, with 

 rounded convex dorsum, bearing rather broad, slightly elevated slit-band with 

 thin raised edges and very fine closely-placed lunula?; umbilical edges narrowly 

 rounded ; umbilical slope short, steep. Mouth transverse, not expanded (except 

 slightly towards base), with short, broad, V-shaped sinus in outer li[). Surface of 

 dorsum ornamented with IG — 28 strong revolving regular longitudinal lines on 

 each side of slit-band and parallel to it, becoming more widely separated outside 

 the inner 8 — 16, which are rounded, thick, and closely placed, the outer ones being 

 thinner, sharper, and twice as far apart ; umbilical edge and slope with 6 — 10 

 similar thin widely separated revolving lines ; interspaces concave, occupied Ijy 

 fine, regular, equidistant transverse lines at right angles to the revolving ones 

 except near the slit-ljand, whei'e they 1)end back and meet it at about 30^ — 45° 

 A few strong arched growth-ridges concentric with apertaral margin near lip meet 

 the slit-band at about 45°. 



Dimensions. — i ii 



Heiofht of shell . . . 14'() mm. . . 23"0 mm. 



Width near mouth . . . 14'5 ,, . about 2o"0 ,, 



Horizon. — Upper Ordovician : Drunnnuck Group (Starfish Bed). 



LocalUij. — Thraive Glen, near Girvan. 



ReniarJiS. — ^Among the examples of this shell in Mrs. Gray's Collection there 

 is some variation with reojard to the number and closeness of the revolving' strias 

 and the transverse growth-lines on the surface; and it seems impossible to 

 consider these Girvan shells as more than a variety of Salter's K. lingualis when a 

 comparison is made with a large number of specimens from the same bed. The 

 crushed specimen with unusually strong growth-ridges, which Etlieridge described 

 and figured in 1877 {op. cit.) as BelleyopUou cf. snbdcciissatus, McCoy, shows how 

 misleading imperfect and distorted specimens may be. 



6. Kokenospira maccuUochi, sp. nov. Plate VII, figs. 9 — ] 2. 



Specific Characters. — Shell composed of 4 — 5 low transverse whorls. Umbilicus 

 vei-y deep, about three-fourths the diameter of the shell, with its centre situated 

 at about two-fifths the height of shell, exposing all the whorls, which only 



