h 



PLATE XXX—ConUmed. 

 Pleurotomaria filitexta. 



Page 73. 

 Fig. 15. The upper side of a small individual. 



Fig. 16. A large individual which is vertically compi-essed and somewhat distorted. 



Fig. 17. A large specimen, imperfect in the spire, which has been laterally compressed, giving an exag- 

 gerated elevation to the volutions. These last two figures ai-e from unusually large individuals 

 of the species. 



Pleurotomaria quadrilix. 



Page 86. 

 Fig. 18. A lateral view, showing the form of the shell and the character of the peripheral band. The last 

 volution is incomplete. Enlarged to three diameters. 



Pleurotomaria nitella. 



Page S). 

 Fig. 19. A lateral view showing the foiiu of the spije. the cliaracter of the peripheral band and stria; (which 

 are farther enlai-ged in tig. 4), enlarged two diaraetei-s. 



Pleurotomaria oapillaria, var. rustica, n. var. 



Page 87. 

 Fig. 20. The upper side of an impeifect specimen, showing the great expansion of the outer volution. 

 Fig. 21. A lateral view of a similar foi-m, which shows a much less elevation of the spire than the ordinary 



fomls of the species. 

 Fig. 22. A very large and much expanded specimen, which is apparently only an exaggerated form of this 

 variety. 



These all differ fi-om the typical foi-ms of P. capUlwria in the comparatively less elevated 

 spire and gi"eater expansion of the outer volution. 



Pleurotomaria Luoina. 



Page 67. 

 Fig. 23. The outer volution, showing the spii-al band without defined limitation, and near the aperture the 

 mark of a fracture during the life of the animal, followed by some irregularity in the subse- 

 quent mode of growth. 



Pleurotomaria Luoina? 



See page 67. 

 Fig. 24. A specimen of irregular form and growth, which has the aspect of a dwarfed and exaggerated 

 variety of P. arata or P. Liiciiia, preserving some features of both. The stri», so far as preserved, 

 have the chai-acter of the latter species, while the costse present much similarity to the former. 

 Pleurotomaria Itys, var. tenuispira. 



Page 87. 

 Fig. 25. The posterior side of the specimen, showing the form of the aperture and rapic'ly attenuating spire, 

 enlarged two diameters. See, also, figure 5. 



Pleurotomaria arata. 



Page 64. 

 Fig. 26. A very rotund form of this species. The specimen is a cast of the interior, jireserving the remains 



of the concentric costae npon the upper side of the last volution. 

 Fig. 27. The npper side of an extremely depressed specimen, partially preserving the shell in a macei-ated 



cond'tion, and showing the strong concentric costse. 



MURCHISONIA MICULA. 

 Page 93. 

 Fig. 28. An enlargement of the Iai<t volution, showing the peripheral band, with the impressed Hue below, 

 And also the subcarinate featui-e of the upper margin of the volution. 



MUROHISONIA INTEROEDENS. 



Page 9-2. 



Rg. 29. The posterior mde, showing the subcenti'al periphei-al band and nearly entire aperture j natural size. 



