74 



Body of a dark cinereous colour, variegated with a sooty brown, or almost 

 black pigment. 



Length of adult female 0.35 mm. 



Remarks. There cannot in my opinion be any doubt that this is the 

 true Amymone spluir'tca of Claus, and the form recorded by Boeck under this 

 name is also unquestionably the same species. Mr. Scott, who on the authority 

 of Prof. Brady believed the Amymone falcata of Norman to be the Clausian spe- 

 cies, described the present form as a new species under the name of A. nigran*. 

 It is easily recognized from any of the species of Teyastes by the form and 

 armature of the ventral prominence of the genital segment, as also by the very 

 dark colour of the body. 



Occurrence. This form is rather common in the upper part of the Chris- 

 tiania Fjord, near the shore among algse, and also occurs occasionally off the 

 west coast of Norway. In spite of its small size, it is easily observable on ac- 

 count of the very dark colour of the body, the animals, when alive, looking like 

 rapidly moving, black granules. 



Distribution. Scottish coast (Scott), Heligoland (Claus), coast of France 

 (Canu), Mediterranean (Claus), Ceylon (A. Scott). 



Fam. 8. Porcellidiidae. 



Characters. Body much depressed, shield-like, with some of the segments 

 imperfectly defined, and with the urosome short and flattened, biarticulate. An- 

 terior antennae short, and composed only of a limited number of articulations. 

 Posterior antennae 3-articulate, with a well-developed outer ramus. Oral parts on 

 the whole of rather peculiar structure, mandibular palp very largely developed; 

 posterior maxillipeds imperfectly subcheliform. First pair of legs with both rami 

 flattened and very dissimilar, the inner one distinctly prehensile. Natatory legs 

 normal. Last pair of legs very different in the two sexes. Sexual difference on 

 the whole very much pronounced. A single flattened ovisac present in female. 



Remarks. This family is as yet only represented by a single genus, viz., 

 Porcellidium Claus, which in several respects deviates considerably from the typical 

 Harpacticoida. In the short depressed form of the body, it somewhat recalls the 



