Adults range in color from olive green to brown to black. Distinguishing characteristics of this hermit crab are white and often also blue bands on the walking legs. The
antennae are grayish-brown with distinct white bands. This hermit crab is also easily identified by the remarkable amount of hair covering its body. The carapace of an adult
P. hirsutiusculus may measure up to in length, and the animal's body may grow to in northern populations. Populations further south than
Puget Sound are smaller and less hairy, and have been recognized as a separate subspecies,
P. h. venturensis. ==Range and habitat==