Plate 23 



Fig. 1. Modiolaria quadrula Gould. Kagos[h]ima [Japan]. Holotype USNM 24064, 



original no. 1419. Length 5, height 3.4, width 3.6 mm. (10 x). 

 Fig. 2. Ervilla iivida Gould. Kagos[h]ima Bay [Japan], 5 fathoms. Length 7, height 4, 



width 3 mm. (5.3 x). 

 Fig. 3. Nucula [Yoldia] sapotilla Gould. Provincetown Harbor [Massachusetts]. Lecto- 



type MCZ 169354. Length 90, height 5, width 5 mm. (2 x). 

 Fig. 4. Leda cuspidata Gould. Hong Kong Harbor [China]. Lectotype Redpath Mus. 



16265. Length 6.5, height 4, width 2.2 mm. (14 x). 

 Fig. 5. Nucula {Acila) insignis Gould. Off the east coast of Japan, lat. 37°, and Hako- 



dadi [Hakodate, Japan]. Holotype USNM 1628. Length 15, height 12, width 8 mm. 



(2.1 x). 

 Fig. 6. Corbula venusta Gould. Hakodadi [Hakodate] Bay [Japan], 5-8 fathoms. Lecto- 

 type Redpath Mus. 15568. Length 9.5, height 7, width 4 mm. (9.8 x). 



