CLASS GASTROPODA 
43 
Thais lamellosa franciscana Dali, 1915 
Plate 35, fig. 6 
Proceedings of the United States National Museum , 49:565; PI. 74, fig. 6. 
Shell sub fusiform, heavy, with a subconic spire shorter than the aper¬ 
ture, laminate reduced to obsolete low imbrications or usually none; whorls 
flattened behind the shoulder; major spirals low, feeble, two on the penulti¬ 
mate whorl, seven or more on the last whorl, minor spirals obsolete or 
none; aperture large, the outer lip flaring, umbilical chink usually distinct 
but closed. Height of shell, 51; of last whorl, 42 ; breadth, 29 mm. (Dali.) 
Type in United States National Museum, No. 63909. Type locality, 
San Francisco Bay, California. 
Range. Known only from type locality. 
Thais lamellosa neptunea Dali, 1915 
Proceedings of the United States National Museum , 49:565. 
Shell large, heavy, smooth, with rounded whorls and deep though 
appressed sutures, resembling a very thick and heavy Chrysodomus. The 
measurements are about the same as in the typical form. 
Type in United States National Museum. Type locality, Cook's Inlet. 
Range. Known only from type locality. 
Thais lamellosa hormica Dali, 1915 
Plate 38, figs. 3, 5; Plate 35, fig. 8 
Proceedings of the United States National Museum, 49 :565 : PI. 74, fig. 8. 
Shell of smaller size than either of the preceding, thin, with spire sub¬ 
acute, produced, longer than the aperture; whorls angular with more or 
less prominent axial laminae, 10 or more to the last whorl, often produced 
at the angles into gutted spines; major spirals two on the penultimate, five 
or six on the last whorl; aperture small, the outer lip hardly expanded, only 
moderately callous; the umbilical chink usually obsolete. Height of shell, 
48; of last whorl, 32; breadth, 20 mm. (Dali.) 
Type in United States National Museum, No. 88862. Type locality, 
inner part of Sitka Harbor, Alaska. 
Range. Sitka, Alaska, to Puget Sound. 
Thais lamellosa cymica Dali, 1915 
Plate 35, fig. 5 
Proceedings of the United States National Museum , 49:565; PI. 74, fig. 5. 
Shell short, robust, heavy, very thick, spire short-conic, shorter than 
the aperture, one mutation being sparsely laminate, the other with a smooth 
[3411 
