Cyclostrema^ Adeorbis, Vitrinella, mid related genera. 143 



Plate XXIII. 



Figure 1. — Girculus supranitidus (Wood) Jeffreys, p. 127. Front view of an authen- 

 tic specimen from the " Craof "; x about 18. 

 Figure 2. — The same. Top view of another specimen (smooth variety) from the 



same locality; x about 20. Both are from the U. S. National Museum. 

 Figures. — Circulus Dalli ^ush, ^. 126. Front view of the type specimen; x about 



12. 

 Figure 3a. — The same. Basal view; x about 12. 

 Figure 4. — Vitrinella multistriata (Verrill) Bush, p. 124. Basal view of an adult 



specimen (No. 35733) from station 2109; x about 10. 

 Figure 5. — Skenea planorbis (Fabricius) Fleming, p. 100. Basal view of a specimen 



from ProT^incetown, Mass.; x 15. 

 Figure 6. — Girculus Dcdli Bush. Top view of the early whorls of the type specimen ; 



X about 17. 

 Figure 7. — Girculus liratus (Verrill) Bush, p. 125. Top view of the nuclear whorls 



of a young specimen from station 2277 ; x about 20. 

 Figures. — Skenea planorbis (Fabricius). Top view of another specimen from Prov- 



incetown, Mass ; x about 15. 

 Figure 8a. — The same. Front view of another specimen from the same locality ; x 



about 13. 

 Figure 9. — Vitrinella helicoidea C. B. Adams, p. 122. Top view of a specimen from 



station 2280; x about 13. 

 Figure 9a. — The same Front view of the same specimen ; x about 13. 

 Figure 10. — Girculus trilix Bush, p. 127. Front view of a young specimen from 



station 2276; x about 20. 

 Figure 11. — Girculus Duminyi (Requien) Jeffreys, p. 125. Front view of a specimen 



from Naples ; x 11. From the U. S. National Museum. 

 Figure 12. — Girculus liratus (Verrill) Bush, p. 125. Front view of a young specimen 



from station 2277 ; x about 15. 

 Figure 12a. — The same. Basal view of the same specimen; x about 16. 

 Figure 12b. — The same. Top view ; x about 13. 



Figure 13. — Leptogyra Yerrilli Bush, p. 136. Front view of one of the type speci- 

 mens from station 2174; X about 19. 

 Figure 1 3a — The same. Basal view of another specimen from the same station ; x 



about 19. 

 Figure 14. — Vitrinella multistriata (Verrill) Bush, p. 124. Front view of a young 



specimen from station 2109; x about 10. 

 Figure 15. — Girculus trilix Bush, p. 127. Top view of the early whorls of a speci- 

 men from station 2276 ; x about 22. 

 Figure 16. — Ghorisitlla lepialea Bush. p. 139. Camera-lucida drawing of a portion of 



the radula ; greatly enlarged, a, One of the marginal teeth which was turned 



outward in mounting. 

 Figure 16 is by the author; the rest are camera-lucida drawings by A. Hyatt Verrill. 



