PLATE IV. 



FIGS. 



1. Alaria arenosa, Hudleston. Dogger Sands. Leckenby collection. 



(Page 110.) 



2. Al. angusta, sp. nov. Inferior Oolite. Bristol Museum. (Page 111.) 



3. Al. " crassicostata." Dogger, Blue Wyke. My collection. (Page 111.) 



4. Al. " Horlonensis." ParJcinsoni-zone, Horton Hill. My collection. (Page 



112.) 



5 a, b. Al. " spinulosa." Two specimens. Dogger, Blue Wyke. (Page 113.) 



6 a, b, c, d. Al. hamus, Deslongchamps. Four specimens. ParJcinsoni-zone, 



Burton Bradstock. My collection. (Page 113.) See also PI. VII, fig. 9. 



7 a. Dwarfed var. of Al. hamus. Parlcinsoni-zone, Notgrove. 7 b, another 



specimen. Parkinsoni-zone, Horton Hill. My collection. (Page 115.) 



7 c. Another variety, " tricincta." Gryphite-grit near Stroud. Witchell 



collection. (Page 115.) 



8 a. Al. hamus, var. Phillipsii, D'Orb. Scarborough Limestone, Cloughton 



Wyke. My collection. 8b, specimen from the Dogger. 8c, from 

 Millepore Rock or Scarborough Limestone. Both Leckenby collection. 

 (Page 116.) 

 9. Al. hamus, var. nodosa. Inferior Oolite, Stoford. Buckman collection. 

 (Page 117.) 



10. Al. pinguis, sp. nov. Inferior Oolite, Dorset. My collection. (Page 117.) 



See also PL VII, fig. 11. 



11. Immature form of Alaria ? Phillipsii. Gryphite-grit, near Stroud. Witchell 



collection. (Page 115.) 



12. Al. cf. rarispina, Schlumberger. ? Sowerbyi-bed, Dorset. Whidborne col- 



lection. (Page 118.) 

 13 a, b, c. A. unicarinata, Hudleston. Three specimens. Dogger, Blue Wyke. 

 My collection. (Page 118.) 



