54 PROCEEDINGS OF THE AA'no:\AL MUSEUM. vol.54. 



Nuculites galeus Williams, 



Fig. 1. A right valve, the same as marked C on figure 19 (specimen number M 

 1790 C). 



14. A left valve from the same locality, somewhat, larger than figure 1, but present- 

 ing the same elements of form (M 1793). 



19c. The same specimen as figure 1, shown in its original position on the slab 

 (M 1790). 



Locality. — Slaty shale of the Leighton member of the Pembroke formation, on the 

 south shore of Pennamaquam River at Kelley Point. Pembroke Township (loc. No. 

 5.3.2 A). 



Nuculites, species indet 



Fig. 2. A nearly circular specimen, the outlines of which are too imperfect for exact 

 delineation, figured in order to illustrate the extreme shortening of the shell. The 

 same as figure 19 d (M 1790). 



Locality. — Same as figure 1. 



Nuculites pelops Williams. 



Fig. 3. An imperfect specimen of a left valve, the same as figure 19 a, of the form 

 better expressed by figure 7 which is made the type of the species. 



19a. The same specimen as figure 3 shown in its original position (M 1790 A). 



7. A left valve showing the full form. By the line drawn across its face (showing 

 its original position in relation to the axis of deformation of the shale in which it lay) 

 the agreement in form with figure 3 is explained. 



Locality. — Same as figure 1 (loc. No. 5.3.2 A). 



Nuculites eurylochus Williams. 



Fig. 4. A left valve which might easily be mistaken for a Paracyclas. The different 

 position of the cross lines in figures 6 and 4 demonstrates how the deforming force 

 was exerted nearly at right angles upon the two specimens, thus accounting, in part, 

 for the present diversity of form (M 1790 B). 



Locality. — Same as figiire 1 (loc. No. 5.3.2 A). 



Nuculites amy'cus Williams. 



Fig. 5. A left valve, probably narrower than normal, the umbonal ridge appears 

 to be accentuated by pressure (M 1801). 



Locality. — Slaty shales of Pembroke formation, near Oak Hill, northwestern Pem- 

 broke (loc. No. 1.43.9 A). 



Nuculites pholus Williams. 



Fig. 6. A small right valve, presenting some of the characters of N. corrugatv^. Ita 

 narrower form and more central position of the beak may be the results of distortion 

 (M 176). 



Locality. — Pembroke shales at the head of Leighton Cove, Pembroke Township 

 (loc. No. 5.3.8 F). 



Nuculites thyestes Williams. 



Fig. 8. A right valve in which the front half of the shell is evidently flattened and 

 produced in the direction of the antero-basal angle, and the posterior part is shortened 

 (M 1789). 



Locality. — Slaty shales of the Pembroke formation from the southern part of West 

 Pembroke (loc. No. 1.45.6 A). 



