REPORT OF THE DIRECTOR 1920-21 I73 



14,8mm to 17.7 mm x 14.6 mm are not abundant; the majority of 

 the shells have the following measurements or are smaller: 14.7 mm x 

 12.8 mm up to 16.8 mm x 15 mm. Macoma groenlandica 

 is not very abundant at Valcour island. The specimens collected 

 here, in general, run smaller than those of the previous locality, but 

 the predominating sizes at Valcour island run somewhat larger than 

 the predominating sizes at Burlington and vicinity. The largest 

 shells are few in number measuring 18.4 rrm x 15.8 mm up to 

 18.8 mm x 16.3 mm and 19 mm x 15. 1 mm. The medium-sized 

 shells, 16 mm x 13.3 mm to 17.5 mm x 14 mm are fairly abundant ; 

 but the most numerous shells are smaller than this, giving the 

 measurements 15 mm x 13 mm to 15.5 mm x 13.7 mm and 15.8 mm x 

 13.2 mm. At Lapham Corners, while the shells average about the 

 same, the largest-sized shells are more abundant: 18 mm x 14.7 mm 

 and 19 mm x 15 mm up to 22 mm x 19.3 mm; the medium-sized 

 Shells vary from 16.2 mm x 14 mm to 17.5 mm x 15.3 m; but the 

 majority of the shells collected at this locality run as follows and 

 smaller: 14 mm x 12.7 mm to 15.7 mm x 13 mm. M. groen- 

 landica was found at Port Kent in much larger numbers than 

 at any other locality, the largest proportion of the shells varying 

 from i2.4mmx 10.4 mm to 13.7 mmx 11. 5 mm and 14.7 mmx 11 mm. 

 The medium-sized shells measure from 15.2 mm x 13.7 mm to 17 mm 

 x 14.7 mm; while the largest shells reach the size of 18 mm x 15 mm 

 to 22 mm x 19.4 mm. At Willsboro, a short distance south, the 

 shells were very abundant, but no shells were found so large as the 

 largest size found at Port Kent; but the medium and average-sized 

 shells run about the same. The largest shells vary from 17.2 mm x 

 13.7 mm up to 19 mm x 16.6 mm and 19.2 mm x 15.8 mm; the 

 medium-sized shells vary from 1 4 mm x 1 1 . 3 mm to 1 5 . 7 mm x 1 3 . 5 mm 

 and 16.7 mm x 13 mm; the majority of the shells average smaller than 

 this and give the measurements: 12 mm x 9.5 mm to 14 mm x 10 mm. 

 Although Essex is only a few miles south of Willsboro, from this 

 point for several miles southward along the lake shore the shells 

 average smaller and thinner, if anything. The majority of the 

 shells vary from 13 mm x 11.8 mm to 15 mm x 12.5 mm; the medium- 

 sized shells, which are much fewer in number, vary from 14.5 mm x 

 13 mm to 16 mm x 13 mm; while the few largest-sized shells show 

 the measurements: 16.7 mm x 14.2 mm to 18.8 mm x 16.5 mm. 

 The shells found a few miles north of Port Henry and just north 

 of Chimney Point, Vt., while very small for the species, still run 

 markedly larger than the Crown Point specimens. At the locality 

 north of Port Henry only a very few (six) of the largest-sized shells 

 were found and these vary from 18.2 mm x 13.7 mm to 21 mm x 



