CLASS GASTROPODA 
309 
Mopalia egretta Berry, 1919 
Lorqtiinia, January 1919, 5. Proceedings of the California Academy of Sciences , series 
4,9:13; Pis. 6, 7. 
Closely allied to M . sinuata, but with the side slopes arcuate, lateral 
areas distinctly raised, sutures strongly dentate, and with the major girdle 
setae sutural in position, long, erect, and branching into numerous, nearly 
straight, slender, needle-like aciculae. Color brownish red with maroon 
and buff mottlings. (Berry.) 
Type in Berry Collection. Type locality, Forrester Island, Alaska, in 
20 fathoms. 
Range. Forrester Island, Alaska, to Puget Sound, Washington. 
Mopalia sinuata Carpenter, 1864 
Supplementary Report, British Association for the Advancement of Science, 648. 
Tryon and Pilsbry, Manual of Conchology, 14:303; PI. 62, figs. 95-97. 
Small, raised sharp back, red and blue, engine-turned; posterior valve 
deeply notched. (Carpenter.) 
Shell oblong, elevated, and strongly carinated, the side-slopes straight. 
Color whitish, clouded with delicate blue-green and maculated with rich 
tawny brown. Median valves hardly beaked, the lateral areas not raised, 
but strongly defined by an elevated diagonal rib; sculptured with two 
oblique series of fine riblets forming a latticed pattern. Central areas 
having a series of longitudinal curved riblets converging toward the median 
keel, crossed by curved radiating threads a little finer and less prominent. 
Anterior valve having 8 (not counting the posterior sutural borders) 
strong, radiating ribs narrower than the latticed intervals. Posterior valve 
depressed, the tnucro being at the posterior third. Interior bluish-white. 
Sinus very small and narrow. Anterior valve having 8 slits, median one 
slit; teeth thickened outside at the edges of the slits. Posterior valve 
having a deep rounded median sinus behind (which is continued upward 
in a superficial excavation to the mucro), and a single slit on each side. 
Girdle rather narrow, leathery, “dusty,” bearing a few hairs, with a 
rounded pore at each suture. Length, \\ l / 2 ; breadth, 7 mm.; divergence, 
105°. (Tryon and Pilsbry, Manual of Conchology .) 
Type in United States National Museum. Type locality, Puget Sound. 
Range. Forrester Island, Alaska, to San Francisco, California. 
Mopalia phorminx Berry, 1919 
Proceedings of the California Academy of Sciences, series 4, 9: No. 1, 10; Pis. 3,4,5. 
Lorquinia, January 1919. 
Shell small, with straight side-slopes. Surface finely granulose. Head 
valve with ten major radiating series of coarse pointed pustules, one or 
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