Hab. Santa Cruz, California, in ligno carioso, locis humidissimis.

Specific characters. Shell rounded, umbilicate, spire depressed, last whorl sometimes subangulate, whorls 6 to 6½, peristome oblique, little deflected above; labium thin, reflexed, thickest below; acute. Color dark brown or olivaceous, with a broad black band between two yellow ones, half hidden on the spire, lips white; within a fine purple with two white bands. Epidermis shining, polished below, the lines of growth faintly visible, sometimes very lightly malleated, and with spiral ridges; above with crowded scars bearing very short bristles in the young shell which fall off in the adult.

Animal slate colored, body cylindrical, rugose, tentacles moderate; foot elongated, behind wedge-shaped.

Shell—large diameter 0.96 to 1.20; smaller diameter 0.76 to 0.96; height 0.42 to 0.54 hundredths of an inch.

Hab. Santa Cruz, Cal., among decayed trees in the dampest places.

This beautiful species is quite rare, only three adult and twelve young specimens having been found after long searching. It will probably occur more commonly in some part of the redwood forests which I have been unable to explore. It approaches nearest to H. Dupetithouarsi and H. fidelis, being between them in form and size as well as colors, but the pilosity at once distinguishes it. Its distinct bands and rounded whorls separate it from H. infumata and Hillebrandii, the latter when perfect having also much longer hairs. The animal is lighter colored than those of H. arrosa, Nickliniana, redimita, ramentosa, tudiculata, (which are all very similar) but much darker than that of Dupetithouarsi, and I believe also of fidelis and infumata. The form of the shell is a link connecting these with Mormonum.

In the tabular arrangement adopted in my State Survey Report, it would come in as the pilose analogue of H. Dupetithouarsi, and H. exarata, which are also its nearest geographical neighbors, as follows:

§ A. Shining;
band triple, not rugose,
l. whorls 6 to 8.		§ B. Dark;
hirsute in the young,
l. whorls 6 to 6½.		§ C. Brown;
band single, rugose, sculptured,
l. whorls 6 to 7.
H. fidelis.H. infumata.[24]H. arrosa.
H. Traskii.[25]H. sequoicola.H. exarata.
H. Dupetithouarsi.H. Hillebrandii.H. Ayresiana.

Judging from the form of H. Mormonum, it is possible that the young will be found to be hirsute.