Plate 26 



Fig. 1. Modiola [Modiolaria] pectinula Gould. St. George's Bank [off southern Massachu- 

 setts]. Lectotype MCZ 216574. Length 15, height 11, width 14 mm. (4 x). 



Fig. 2. Myadora fluctuosa Gould. Kagos[h]ima Bay [Japan]. Holotype USNM 1313. 

 Length 8, height 7, width 3 mm. (6 x). 



Fig. 3. Mactra solidissima curia Gould. Grand Manan Island [New Brunswick]. Holo- 

 type MCZ 225314. Length 82, height 69, width 40 mm. ( 3 /4 x). 



Fig. 4. Mysia figlina Gould. Off the east coast of Japan, lat. 37°, 20 fathoms. Holotype 

 USNM 1629. Length 18, height 16, width 6 mm. (2 x). 



Fig. 5. Mysia abbreviata Gould. Hong Kong Harbor [China]. Holotype USNM 541. 

 Length 20, height 17, width 12 mm. (2.1 x). 



Fig. 6. Mysia {Felaiiici) usta Gould. Hakodadi [Hakodate] Bay [Japan], 8 fathoms. 

 Holotype USNM 1649. Length 30, height 27, width 15 mm. (2 x). 



Fig. 7. Thracia pusilla Gould. S[h]imoda [Japan]. Holotype USNM 24060, original 

 no. 2001. Length 8, height 5, width 4 mm. (5.5 x). 



