180 



REFERENCE TO PLATE; 



Plate 38. 



FIGURE. 



1,2,4. Scurria gigantea Sowb. Original, . 



3. Scurria gigantea dentition. A. J. C, 



5-7. Scurria gigantea (kochii Phil.). Abbild., . 



Plate 39. 



8-11. Propilidium ancyloide Forbes. Moll. Keg. Arct., 

 12. The same, young shell. Moll. Reg. Arct., 

 13-15. Dentition and mandible Tjf the same. Blake Rep., 



16. Scurria scurra Less. Original, 



17. Dentition of Lepetella tubicola, 



18. Lepetella tubicola Verrill. Trans. Conn. Ac, 



19. Lepetella tubicola, enlarged embryonic apex, 



20. 21. Lepeta coppingeri Smith. P. Z. S., 



22. Scurria mesoleuca, dentition. A. J. C, 



23, 24. Scurria scurra, enlarged apex. Original, 



25. Scurria scurra, animal. Voy. Am. Mer,, 



26, 27. Scurria scurra Less. Original, 

 28, 29. Nervous system of Titiscania limacina Bergh. (See 



pl.-il.) 



29, 

 31. 

 32. 

 33, 

 35. 

 36, 

 38, 

 40. 

 41, 

 43. 

 44. 

 45, 

 47, 

 49. 

 50. 



Plate 40. 



30. Lepeta cicca Miill. Moll. Arct. Norv., 



Lepeta c^eca, dentition. Moll. Arct. Norv., 



Lepeta cpeca, apex, x 4. A. J. C, . 



34. Lepeta concentrica Midd. A. J. C, . 



Lepeta concentrica, dentition. A. J. C, 



37. Lepeta concentrica Midd. A. J. C, . 



39. Lepeta alba Dall. Original, 



Lepeta alba Dall, dentition. A. J. C, . 



42. Pilidium fulvum Miill. F. & H., . 



Pilidium fulvum, dentition. Moll. Arct. N( 



Lepeta instabilis Dall. A. J. C, . 



46. Lepeta instabilis Dall. Original, 



48. Propilidium scabrosum Jeffr. P. Z. S., 



Propilidium pertenue Jeffr. P. Z. S., 



Propilidium compressum Jeffr. P. Z. S., 



Plate 41. 

 53-65. Titiscania limacina Bergh. Morphol. Jahrb., . 



(See also pi. 39, figs. 28, 29.) 

 Plate 42. 



66-68. Acmsea marmorata T.-W. Typical. Original, 

 69, 70. Acrasea marmorata var. submarmorata. Original, 



65 

 65 

 65 



72 

 72 

 72 

 62 

 75 

 75 

 75 

 71 

 61 

 62 

 62 

 62 



164 



68 

 68 

 69 

 69 

 09 

 70 

 70 

 70 

 70 

 69 

 69 

 73 

 74 

 74 



164 



