56 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.54. 



Nuculites lichas Williams. 



Fig. 20. A right valve. In its present form this has little in common with N. corru- 

 gatus. It is quite easy to imagine, however, the specific characters of this shell to have 

 been produced by distortion of a specimen originally like figm-e 12, with which it is 

 associated (M 1816). 



Locality. — Same as figure 12 (5.3.8 F). 



Nuculites nessus Williams. 



Fig. 21. A right valve of a tliin shelled species, the puckering of the surface of which 

 is quite evidently secondary. The lower half of the shell appears as if it had been 

 thrust backward in relation to the upper half. The impressed grooves behind the 

 beak are nearly as strong as the clavicle, but, as morphologic characters, are equally 

 prominent (M 1815). 



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



Plate 12, 



All natural size, except figure 7, magnified 2 diameters; figure 8, magnified; and 11 

 and 14 magnified several diameters. 



Nuculites trescotti Williams. 



Fig. 1. A left valve, exhibiting the general characteristics of form, but larger than 

 the average size of the specimen from the same locality (M 1766). Another specimen 

 (M 1773) (not here figured) is cotypical with it and better represents the average char- 

 acters of the species. 



Locality. — Edmunds shales in the cove at the northern end of Straight Bay on Crowe 

 Neck, Trescott (5.33.8 B). 



Nuculites galeu^ Williams. 



Fig. 2, Slightly elongate right valve referred to this species. Compare with figure 

 14 of plate 11 (M 1800). 



Locality. — Pembroke shales in vicinity of Oak Hill, westem,part of Pembroke Town- 

 ship (loc. No. 1.43.9 A). 



Nuculites atreus Williams. 



Fig. 3. A right valve, having a shorter and more gibbous form than N. subplanus 

 and differing also in surface characters (M 1788). 



Locality. — Pembroke shales, southern part of west Pembroke village, west side of 

 Pennamaquam River (loc. No. 1.45.6 A). 



Nuculites robustus Williams. 



Fig. 4. A small slab with three internal molds, showing the high prominent beak, 

 strong clavicle and the strong reinforcement of the inside surface separating the um- 

 bonal cavity from the impression of the posterior muscular scar (M 1776). 



Locality. — Pembroke shales on east side of Yoimgs Point near the end of Denbow 

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



7. A right valve, magnified two diameters (the same specimen represented on upper 

 side of figure 4). In making this figure, the specimen has been tiu-ned upward so as to 

 show under the beak the hinge margin with the crenulations (M 1776). 



Locality. — Same as figure 4 (loc. No. 5.25.4 B). 



10. Another specimen of the right valve (M 1777), The form is more elongate than 

 figure 4. 



Locality. — Same as figure 4 (loc. No. 5.25.4 B.) 



