110 ME. G. C. CEICK ON THE MUSCULAE ATTACHMENT OF THE 



Fig. 3. Ventral aspect of same, showing incised line on median portion. 



4. Right lateral aspect of fragment of another example, showing anterior bonndary of right 

 muscular scar and of a portion of the anuulus. 



Baculites vagina, Forbes (p. 78) . 

 Fig. 5. Dorsal aspect of portion of body-chamber, showing near the base the anterior boundary of the 

 two muscular scars. 



Hamites maxinms, J. Sowerby (p. 79). 

 Fig. 6. Dorsal aspect of body-chamber, showing the two muscular scars near the base. 



7. Left lateral aspect of the same. 



8. Dorsal aspect of another example. 



9. A portion of the same enlarged, showing the two scars, each bearing near its anterior border 



a small roughened patch, and also traces of a narrow band connecting the scars. X '{. 



Cr'wceras quadratum, n. sp. (pp. 74 & 79). 

 Fig. 10. Dorsal aspect of a fragment of the body-chamber, exhibiting the two scars. 



11. Left lateral aspect of the same. 



12. Dorsal aspect of a frajjment of another example in which the anterior boundaries of the two 



scars nearly meet in the median line. 



13. Left lateral aspect of the same. 



Ancyloceras Matheron'ianmii, d'Orbigny (p. 80). 



Fio-. 14. Left lateral aspect, showing portion of anterior boundary of left muscular scar, x \. 



15. Right lateral aspect of a portion of the same, exhibiting the termination of the anterior 



boundary of the right muscular scar. X 5. 

 If). Dorsal aspect of a portion of the same, showing the anterior boundaries of the two muscular 

 scars, that on the riglit being much higher than that on the left. X \. 



Macroscaphites giyas, J. de C. Sowerby, sp. (p. 81). 



Fig. 17. Riglit lateral aspect. x\. 



18. Left lateral aspect of a portion of the same, showing part of the boundary of the two 



scars. X 5. 



19. Dorsal aspect of a portion of the same, also showing the anterior boundary of the two 



scars. X 5. 



Scaphites binodusiis, A. Roemer (p. 81). 

 Fig. 20. Left lateral aspect. 



21. Dorsal aspect of a portion of the same, with part of the body-chamber removed. 



Scaphites aqualis, J. Sowerby (p. 82). 

 Fi"'. 22. Dorsal aspect of a fragment of the body-chamber. The curved lines at the lower part of tlie 

 figure are the impressions of the ornaments of the septate part of the shell ; the anterior 

 border of the muscular attachment is indicated by the arrow. 



