Abstract
Enterocola hessei Chatton & Harant, 1924 is redescribed, based on females living in the compound ascidian Clavelina lepadiformis (Müller, 1776) collected at Roscoff. The name of the ascidian host is established for the first time in this paper, because females of Enterocola in C. lepadiformis have been identified as E. hessei on the basis of the characteristic features of this species as described by Chatton & Harant: antennule indistinctly 2-segmented, and small second segment with truncated apical margin; antenna flat, rectangular, with six simple setae, and its mediodistal margin (with two long setae) not protruded; long rectangular endopods of legs 1–4 with two unequal, extremely long simple setae terminally; long cylindrical caudal ramus with rounded terminal margin; eggs in ovaries and egg sacs orange.