KOKENOSPIRA SECUNDA. 39 



of the Drummuck species, there seems to be a globose variety with more numerous 

 revolving lines. Most of the specimens in Mrs. Gray's Collection occur as internal 

 casts, but the shell is occasionally preserved both in the case of the type and the 

 variety. 



8. Kokenospira nicholsoni, sp. nov. Plate VIII, fig. 3. 



Specific Characters. — Shell subglobose, of 3 transverse rounded whorls. 

 UmbiHcus deep, about one-third the diameter of the shell. Outer whorl large, 

 embracing fully three-fourths of preceding whorl ; wider than high, subreni- 

 form in section, with dorsum broad, gently convex ; umbilical edges narrowly 

 rounded ; umbilical slopes short, steep, rounded. Slit-band broad, slightly 

 elevated, with 8 — 1 strong low revolving lines parallel to it on each side and a 

 few successively wider apart on the umbilical slopes ; fine transverse, regular, 

 closely-placed lines crossing tliem at right angles are present in the larger 

 interspaces. 



Dimensions. — Height of shell, about 12-5 mm. ; width of mouth, about 15 mm. 



Horizon. — Lower Ordovician : Stinchar Limestone Group. 



Locality. — Craighead, near Girvan. 



Bemarks. — This somewhat imperfectly known species appears to be separable 

 from K. maccnllochi on account of its smaller umbilicus, the more rounded 

 umbilical edges and the more eml^racing whorls. The mouth is not preserved, 

 and no perfect specimens are available, the only examples of the shell which I 

 know occurring in Mrs. Gray's Collection. 



9. Kokenospira secunda (Reed). 



1906. Bellerophon {Bvcanopsis) secundus, Reed, Geol. Mag. [5], vol. iii, p. 366, pi. xx, figs. 15, 15 «. 



Specific Characters. — " Shell subglobose, with broad rounded back ; of few 

 volutions; whorls transversely subquadrate, broader than high; umbilicus 

 moderately large, deep, with subangular margins \= umbilical edges], exposing 

 inner Avhorls ; aperture transverse, more or less expanded ; inner lip refiexed on 

 inner end of last whorl ; slit-band rather broad, with narrow raised margins, not 

 depressed, and fine gently curved lunulse ; surface of shell on each side of band 

 marked with rather strong, regular, straight, parallel, subequal, revolving raised 

 lines, about 24 in number, closely crowded near band but becoming more widely 

 separated laterally, crossed at i-ight angles by very fine, transverse, slightly wavy 

 striae." 



Dimensions. — Height, about 15 mm. 



