464 Ay/ierican Seasbelh 



common. John Q. Burch reports that the siphons have characteristic tubercles 

 on their surface. Siphon cream, covered with a brownish periostracum at 

 the base, the remainder studded with small bars of chitinous material, thus 

 giving a warty appearance. 



Genus Nettastoviella Carpenter 1865 

 Nettastomella rostrata Valenciennes Rostrate Piddock 



Puget Sound to San Diego, California. 



% inch in length, with a very large, oval gape posteriorly, and anteriorly 

 with a long, pointed, smooth rostrum or snout which bends downward. 

 Shell proper with widely spaced, delicate, high, concentric lamellae. With- 

 out accessory plates and apophyses. Found by breaking stones apart. Mod- 

 erately common. 



Genus Parapholas Conrad 1849 

 Farapholas californica Conrad Scale-sided Piddock 



Southern California. 



3 to 5 inches in length, oval-oblong, rotund, especially anteriorly. Pos- 

 terior round in cross-section and gaping. Dorsal margin with 2 long, com- 

 plicated, accessory plates. Ventral edge covered by one elongate plate. 

 Anterior gape closed over by 2 thin, eggshell-like extensions. Sides of snout 

 with foliated periostracum. Shell proper with a long, radial groove pushing 

 in at the middle. Color grayish white. Interior with 2 long, descending, 

 shelly rods under the middle of the hinge. Common. 



Genus Nave a Gray 1851 

 Navea subglobosa Gray Abalone Borer 



San Pedro to Monterey, California. 



/4 to % inch in size. Very obese and subglobular. Anterior end widely 

 gaping with the thick edge of the valves coarsely denticulate. Commonly 

 found boring in abalone shells (Haliotis). 



Genus Martesia Blainvillc 1824 

 Martesia striata Linne Striate Martesia 



Plate 32W 



West Florida to Texas and the West Indies. 



