326 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 45. 



same character when perfect and two others more or less crushed 

 and imperfect show like characters. 



In the fauna of locality No. 8. 21.1 A two types of Chonetes appear, 

 the first of which presents the typical character of Chonetes edmundsi 

 as seen in the lower faunas, where it is the only representative of the 

 genus Chonetes. Tliis series is numbered M1156. 1 to 9. 



Specimen No. M1156.1, dimensions 11^ by 7mm., has the umbonal 

 region strong and arching up directly from the hinge area, arching over 

 to the front, making the central portion of the body swollen and the 

 cardinal angles flattened. Four spines are visible on right side, larger 

 at outer end and incurved. The radii occasionally bifurcate, are 

 somewhat finer on ears, and at front are about 80 in number. 



Specimen No. M1156.2, dimensions about 13 by 8 mm., is a mold 

 of exterior of pedicle valve and shows 5 spines each side. The 10 or 

 12 radii at the extreme cardinal corners are very fine, and with the 

 others will make over 90, but the form and the size of radii over the 

 body of shell are not distinguishable more than varietally from the 

 other specimens. 



Specimen No. M1156.3 is a smaller specimen, 9 by 6 mm., a pedicle 

 valve. There are about 60 evident radii and those on the ears 

 indistinct; if in same proportion to other shells they would number 

 to 75 or 80. The shell is a mold of the interior. This shows the 

 typical form of C. edmundsi, except it is a little longer proportionate 

 to width, possibly clue to crushing. 



Specimen No. M1156.4, dimensions 9^ to 5^ mm., arched and 

 swollen central part, with the ear portions less flattened, presenting 

 the form of the larger more typical form. This has the radii of same 

 size, only occasionally bifurcated and making, if all could be counted, 

 about 75 to 80 at edge. 



Specimen No. Ml 156.5 is a specimen of the other species which I 

 identify with the forms of C. novascotica Hall seen in the Waldron, 

 of which mention will be made later. 



Specimen No. M1156.6 is a larger and somewhat distorted form, the 

 edges of which are indistinct and the reference is doubtful. It has 

 the general character of C. edmundsi except it is larger; width 14^ by 

 length 9 mm., and the radii will reach over 90. 



Specimen No. M1156.7, mold of interior of brachial valve, dimen- 

 sions 13 by 7^ mm. and radii 75-80. This valve is concave and in the 

 mold shows the gradual arching without prominence of umbonal part 

 seen in the pedicle valve. 



Specimen No. Ml 156.8 is a more perfect mold of interior of brachial 

 valve, concave but slightly so, showing nearly flat in the specimen. 

 Radii are 65-75 in number. 



Specimen No. Mil 56.9 is a typical pedicle valve, dimensions 11 by 

 6^ mm., abruptly arching from the hinge area; body convex, ears 



