Suborder 2. 



Cladocopa. 



General Characters. Shell without any presistent aperture in front, the 

 valves admitting of being perfectly closed all around. Both pairs of antennae 

 distinctly natatory, the posterior ones having both rami developed for that 

 purpose. Mandibles with the palp of weak structure and not at all pediform, 

 nor clawed at the tip. 2 pairs only of postoral limbs present, the anterior 

 ones, representing the maxillae, largely developed, biramous, and partly nata- 

 tory; posterior pair (maxillipeds) of a much more delicate structure and chiefly 

 subservient to respiration. Posterior part of body strongly deflexed, and term- 

 inating in 2 short and broad juxtaposed lamellae, edged below with claw-like 

 spines, behind which an unpair, small setiform process occurs. Heart and 

 visual organs wholly absent. Frontal tentacle replaced by 2 juxtaposed 

 ciliated setae. 



Remarks. This suborder was proposed in the year 1865 by the present 

 author, to include the very anomalous, and at that time wholly unknown genus 

 Poly cope, the type of the family Polycopidce. I am still fully convinced, that 

 this suborder ought to be supported, and that the classing of the family Poly- 

 copidae within the suborder Myodocopa, as proposed by 0. W. Muller, is 

 quite inadmissible. True, a slight tendency towards the Myodocop type may 

 be found as regards the structure of the posterior antennae and in particular 

 the shape of their outer rami; but otherwise the differences are much to great 

 as to allow a closer association of that family to the Myodocopa. This has 

 also been fully conceded by the most recent author, Dr. Skogsberg, who has 

 restored this suborder, though under a different name viz , Polycopiformes. 

 The suborder comprises a yet only a single family, the general characters of 

 which are given below. 



