NO. 2225. NUCULITES FROM THE MAINE SILURIAN— WILLIAMS. 55 



Nuculites rohustus Williams. 



Fig. 9. A figure of the exterior surface; produced directly from the mold of the 

 exterior of the same specimen, mold of the interior of which is represented by figures 

 12 of plate 12. This effect is produecd by reversing the figure on the plate from the 

 position in which it was photogiaphed, making it to appear convex instead of concave 

 as is the original specimen (M 1786). 



Locality. — Gray Pembroke shales from the east side of Young's Point near the end 

 of Denbow Neck, Lubec (loc. No. 5.25.4 B). 



Nuculites corrugatus Williams. 



Fig. 10. A sUghtly elongated left valve, presenting otherwise the typical charac- 

 ters of the species (M 1764 A). 



Locality. — Shales from the upper beds of the Edmunds formation, in the cove at the 

 north end of Straight Bay, northeast corner of Crowe Neck, Trescott (loc. No. 5.33.8 B). 



12. An undistorted specimen of a left valve, showing the normal shape of this species 

 from the original locality. This specimen expresses the mean form of which the 

 two figures originally published are extremes (M 1215 A). 



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

 (loc. No. 5.3.8 F). 



18. A left valve somewhat crushed at the umbo, the clavicle forced outward toward 

 the front margin (M 1764 B). 



LocaZ%.— Edmunds formation same as figure 10 (loc. No. 5.33.8 B). 



Nuculites battus Williams. 



Figs. 11 and 13. Two specimens of left valves. The quadrate form is probably pro- 

 duced by flattening of the very thin shells. The pustulose elevations of the surface 

 are seen, in the original, to be impressions of ostracods pressed through the shell from 

 inside (M 1803 and 1802). 



Locality.— Slaty Pembroke shales from vicinity of Oak Hill, Western Pembroke 

 Township (loc. No. 1.43.9 A). 



Nuculites laden Williams. 



Fig. 15. A right valve, somewhat resembUng N. battue, but a more gibbous form 

 (M 1317). 

 Locality. — Same locality as figure 12 (loc. No. 5.3.8 F). 



Nuculites abnormis Williams. 



Fig. 16. An imperfect mold of interior of a left valve, showing a very high, flattened 

 form. This specimen is probably distorted by pressure. The specimens of N. spe- 

 ciosus of plate 12 (M 1805) came from the same locality. 



Locality.— Gray slaty shales at the base of the Pembroke formation on west side of 

 Coffin Neck, opposite Goosberry Island, Lubec (loc. No. t.44.2 A). 



Nuculites subplanus Williams. 



Fig. 17. A compressed, oval left valve, entirely differing from N corrugatus in 

 form (compare with figs. 10 and 18 from the same locality) but resembling it in 

 the possession in this locality of fine radiating lines on the posterior umbonal ridge 

 and slope (see pi. 12, fig. 8) (M 1765 A). 



Locality. — Edmunds formation. Crowe Neck locality same as figure 10 (loc. No. 

 5.33.8 B). 



