Explanation' of Plate 24 



Figs. 1-3. — Macoma moesta (Deshayes): 1, a typical adult from 147 feet, showing the 

 very short posterior end and the brownish concretion along the margin except at the 

 anterior end; 2, young specimen from 522 feet, showing e.xterior of right valve; 3, 

 young specimen from 80 feet (Aug. 21, 1948), showing interior of left valve. 



Fig. 4. — Thracia myopsis (Moller), from 341 feet. 



Figs. 5-7. — Macoma calcarea (Gmelin): 5, 6, from 72 feet, showing variation in shape 

 and in height: length ratio; 7, from 80 feet (Aug. 21, 1948). showing variation in sinus 

 of right and left \-alves. 



Fig. 8. — Thracia (Lanipeia) adamsi, new subgenus, new species, from 110 feet (Sept. 15, 

 1948), view of interior, showing variation in sinus of right and left valves. 



M.\c;nific.a.tion: All X 1.36. 



