Plate 27 



Fig. 1. Macoma lunella Gould. China Seas: lat. 24° N, 25 fathoms. Length 10, height 



8, width 4 mm. (5.7 x). 

 Fig. 2. Mytilus glomeratus Gould. San Francisco [California]. Lectotype MCZ 169175. 



Length 10, height 8, width 5 mm. (7 x). 

 Fig. 3. Lutraria [Mactrella] ventricosa Gould. Mazatlan [Mexico]. Holotype MCZ 



169451. Length 100, height 68, width 48 mm. (#„ x). 

 Fig. 4. Modiolaria cuprea Gould. Kagos[h]ima Bay [Japan]. Holotype USNM 24066. 



Length 7, height 4.5, width 4 mm. (5.8 x). 

 Fig. 5. Machaera sodalis Gould. Hakodadi [Hakodate] Bay [Japan]. Lectotype USNM 



1638. Length 42, height 20, width 7 mm. (2.1 x). 



