CLASS GASTROPODA 
65 
Lacuna porrecta exaequata Carpenter, 1864 
Supplementary Report, British Association for the Advancement of Science, 656. An¬ 
nals and Magazine of Natural History, ser. 3, 14:428. 
L. var. exaequata: testa L. effusae simili, seel anfr. planatis, suturis 
parum impressis. Long., 5; long, spir., 2; lat., 42 poll. (Carpenter.) 
The form L. exaequata is intermediate between the very different 
L. porrecta and L. effusa. The lacunae vary so much (vide Forbes and 
Hanley in loco that, even with a large multitude of specimens, it is not 
easy to state what -constitutes a species. (Carpenter.) 
Whorls flattened, sutures scarcely impressed. Length, 12.5 mm. 
(Tryon, Manual of Conchology.) 
Type in United States National Museum. Type locality, Neah Bay, 
Washington. 
Range. Known only from type locality. 
Lacuna porrecta puteoloides (Carpenter MS) Dali, 1919 
Proceedings of the United States National Museum, 56:349. 
The only difference between it and the typical L. porrecta, to which 
Doctor Carpenter allied it as a variety, appears to be a considerably nar¬ 
rower pillar and consequently sharper and narrower umbilical groove in 
the variety. (Dali.) 
Type in United States National Museum, No. 46984. Type locality, 
Lobitas, California. 
Range. Known only from type locality. 
Lacuna glacialis Moller, 1842 
Index Molluscorum Grocnlandiae f 9. Tryon, Manual of Conchology, 9: PI. 55, fig. 76. 
Testa ovato-conica, rufo-fusca; anfr. 5 cylindraceis, plicis meni- 
branaceis angustis, cinereis, confertis ornatis. L. 5"'. Rs. (Moller.) 
Stout, solid, opaque, epidermis light yellowish ; whorls convex, a little 
tumid or round-shouldered above, epidermis thin, often gathered into 
obliquely longitudinal folds; under it the surface is minutely spirally 
striate; pillar lip flattened, expanded; imperforate. Length, 12.5 mm. 
(Tryon, Manual of Conchology.) 
The English description is of Lacuna crassior Mtg., which is equal to 
Lacuna gracialis. 
Type locality, Greenland. 
Range. St. Paul Island, Alaska; also Greenland. 
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