of the North Atlantic and of North-Western Europe. 625 



Section II. — Myodocopa. 



Antennse two-branched; basal joint very massive and large, subcordate or 

 pyriform ; larger branch natatory, its first joint long, naked, followed by many 

 short setiferous joints ; secondary branch usually minute, sometimes absent, in 

 male generally rather larger, and formed for grasping. Antennules scarcely 

 natatory, except in males. Mandibular palp very large, geniculate; subpediform, 

 destitute of branchial appendage. First maxillae without branchial appendage. 

 Caudal lamina broad, flattened, hinder margin beset with ungues. 



* All limbs posterior to the first maxillae pediform or subpediform. 



Last limb minute, consisting of two articulations. No eyes or ocellus. 

 Antennules short, in ? weak, indistinctly articulated, immoveable ; 

 in S larger, articulated, with long terminal setae. Mandibles with 

 well developed teeth. Small vibratory laminae attached to penulti- 

 mate and antepenultimate pediform limbs. Caudal laminae broader 

 than long. Fam. Conchoeciidoe, Gr. 0. Sars. 

 ** Limbs posterior to the first maxillae not pediform or subpediform ; last limb 

 in the form of an elongated, flexible, annulated, vermiform organ of 

 great length, curved upwards and backwards, ending in two lips, and 

 furnished at and near the extremity with long, delicate spines, which 

 are barbately spinulose at their apices. Antennules large, 5-7 jointed, 

 geniculated at the end of first joint, with long setae at the extremity. 

 Mandibles without teeth. Eyes generally present and compound, 

 pedunculated, widely separated, and also between them a simple eye. 

 Large vibratory laminae attached to the antepenultimate, and usually 

 also to the penultimate limbs. Caudal laminae oval or subtriangular, 

 longer than broad. Ova carried within the shell behind the body, 



1. Antennules having a terminal unguis as well as setae. Mandible 

 with a recurved, falciform, toothed process. First maxillas 

 consisting of only two lobes, one elongated, triangular, 

 naked ; the other thin, membranous, falcate, ending in two 

 setae, and having the inner edge closely set with pectinately 

 arranged, very long setae. Second maxillae consisting of a 

 single, flattened, unjointed member, curiously twisted in the 

 middle, its inner margin edged with setae ; vibratory lamina 

 large. Third maxillae simple, subtriangnlar ; distal edge setose ; 

 no vibratory lamina. Animal furnished at the back of the 

 hinder portion of the body with two series of membranous, 

 lamelliform branchiae. Fam. Asteropidce, Brady and Norman. 



