“This species is small, reaching a maximum length of 7 cm (2.8 in). The body is stout, cylindrical, slightly swollen at the middle, and bluntly rounded at both ends. The body wall is thick, smooth, and soft. The numerous tube feet, all with terminal suckers, are scattered over the entire body and lack an ordered arrangement along the radii. Most of the feet remain extended, even in preserved material, giving the species a furry appearance. There are 10 tentacles, of which the ventral pair is smallest. The body wall
ossicles are large tables with squarish to rectangular disks, usually perforated with four to eight large holes and up to 10 smaller ones. At the center of the disk there is a spire composed of two pillars and ending in a few small spines. The supporting ossicles of the tube feet are large tables with elongate curved disks and robust spires.
T. deichmannae (
H. inermis) is drab, with a grayish brown body wall and light gray to light brown tube feet” (Hendler et al 276).