TROCHIDAE 109 



Margarites succinctus Carpenter Tucked Margarite 



Figure 31a 



Alaska to Lower California. 



Vs, inch in length, 4 whorls, sHghtly wider than long, smoothish except 

 for microscopic, weak threads or incised lines. Umbilicus small, round, deep. 

 Exterior grayish brown, commonly with microscopic, brown, spiral lines. 

 Aperture dark-greenish iridescent. Littoral on algae; common. 



Subgenus Pupillaria Dall 1909 

 Margarites pupillus Gould Puppet Margarite 



Figure 31c 



Bering Sea to San Pedro, California. 



Vs to Y2 inch in length, whorls 5 to 6, upper whorls with 5 to 6 smooth- 

 ish, small, spiral threads, between or over which are microscopic, axial, slant- 

 ing threads. Umbilicus a minute chink. Exterior dull, chalky whitish to 

 yellowish gray. Aperture rosy to greenish pearl. Apex usually eroded. A 

 common littoral species in the northern half of its range. Also dredged in 50 

 fathoms. 



Genus Lischkeia P. Fischer 1879 

 Subgenus Turcicula Dall 1881 



Lischkeia bairdi Dall Baird's Spiny Margarite 



Plate 3 c 



Bering Sea to Coronado Islands, Mexico. 



2 inches in length, moderately fragile, sculptured with varying number 

 of spiral rows of fairly large beads. No umbilicus. Shell white with a thin, 

 glossy, yellowish-green periostracum. Interior of aperture pearly-white. This 

 is a choice deep-water species much sought after by collectors. Moderately 

 common in 100 to 600 fathoms. 



Subgenus Cidarina Dall 1909 

 Lischkeia cidaris Carpenter Adams' Spiny Margarite 



Figure 3ih 



Alaska to Lower California. 



I to I /4 inches in length, moderately solid, similar to L. bairdi but with 

 a higher, flat-sided spire. The suture is usually more impressed. Color gray 

 to grayish white. Moderately common from 20 to 350 fathoms. 



