140 GASTEROPODA OF THE INFERIOR OOLITE. 



59. Alaria solida, Lycett, var. Plate VII, fig. 6. 



Description : 



Length . . . . .17 mm. 



Width of body-whorl to height of shell . . 40 : 100. 



Spiral angle ..... 36°. 

 The apical whorls, conjectured to be about three in number, are wanting ; the 

 four remaining whorls of the spire are angular, the keel being rather above the 

 middle ; a series of nodular costse, wide apart, originate upon the keels and extend 

 for some distance below : in the penult these assume considerable proportions, and 

 are seen to decussate with strong spiral lines. The body-whorl is rather shorter 

 than the spire, moderately ventricose, and carries one very prominent and spinous 

 posterior keel, from which a short upturned digitation emanates ; beneath the 

 posterior keel is a strong system of spirals (the several "encircling grooves" of 

 Lycett), one of which functions as an anterior keel. From this proceeds an 

 imperfect anterior digitation. The whole of the body- whorl and short upturned 

 canal-sheath are richly chased with fine spiral ornament. Other indications 

 wanting. 



Relations and Distribution. — A single specimen from Crickley — most probably 

 from the Oolite-Marl — is all I have seen. This belongs to Mr. Brodie, and is 

 marked " Rostellaria solida, n. sp.," in Lycett's handwriting. It is less rugose 

 and less variciform than the Jermyn Street specimen, which I assume to be the 

 type, and it possesses, moreover, an incipient anterior digitation, like that of Alaria 

 Doublieri. This, however, may have existed in the Jermyn Street specimen, 

 but destroyed or obliterated subsequently. 



N.B. — It is to be regretted that the interesting forms described as Alaria 

 spinigera, Al. solida, and Al. solida, var. are so scarce that we are very much in 

 the dark as to their true nature. Whilst exhibiting important differences, they 

 possess several features in common, such as a comparatively short spire, spinous 

 or rugose ornamentation, and a short, upturned principal digitation. 



60. Alaria hamoides, sp. nov. Plate VII, figs. 7 a, 7 b. 



Description : 



Length . . . . .24 mm. 



Width of body- whorl to length of shell . . 42 : 100 



Spiral angle ..... 26°. 



Shell turrited, fusiform. Probable number of whorls ten to eleven (apical ones 



