228 



i. Ceylonia armata (Claus). 



Jurinia armata Claus, 1S66, p. 25, pi. II, figs. 15—24. 



Ceylonia aculeata Thompson & Scott, 1903, p. 265, pi. VII, figs. 1 1— 23. 



Three females identical with the form described by the late I. C. Thompson and the 

 writer as Ceylonia aculeata were found in the washings from dredged invertebrata collected 

 at Station 273, off Pulu Jedan, East coast of Aru Islands, from a depth of 11 metres. 



The species described by Claus as Jurinia armata although illustrated rather indif- 

 ferently, is apparently the same Copepod as that found in the washings from dredged inverte- 

 brata collected off Point de Galle, Ceylon, by Professor Herdman, and named Ceylonia aculeata 

 by Thompson and Scott. The specific name must, therefore, be discarded. 



This species has hitherto only been known from the Mediterranean and from the Indian 

 Ocean off Ceylon. 



35. Family Ilyopsyllidae nov. 



The body is short and gibbons. The cephalic segment is very large and is equal to 

 the combined length of the rest of the animal. The rostrum is moderately strong and pointed. 

 The abdomen of the female is composed of four segments, The antennules are very short and 

 five-jointed. The basal joint is greatly expanded and its upper margin is projected forward into 

 a hood-like process. The endopodite of the antennae is small and three-jointed. There is no 

 exopodite. The mandibles, maxillae and maxillipedes are very reduced and rudimentary. The 

 exopodites of the first four pairs of feet are three-jointed. The endopodite of the first pair is 

 very short, non-prehensile and indistinctly two-jointed. The endopodites of the second, third and 

 fourth pairs are three-jointed. The fifth pair of feet is very small and one-jointed. 



The male resembles the female in general appearance, but the antennules are prehensile 

 and the abdomen is composed of fïve segments. 



The type of the genus is Ilyopsyllus coriaceus Brady and Robertson. The peculiar form 

 of the body, the greatly inflated and hood-like basal joint of the antennules, and the very 

 rudimentary mouth organs readily separate this family from any of the other Harpacticoida. 



Genus Ilyopsyllus Brady and Robertson, 1873. 



The body is very tumid. The antennules are short and five-jointed with a greatly 

 inflated basal joint. The antennae are short and stout. The endopodite is three-jointed. There 

 is no exopodite. The mandible is short and the cutting edge is rather coarsely toothed. The 

 palp is small and one-jointed. The maxillae and maxillipedes are extremely rudimentary. The 

 second pair of maxillipedes is simple and non-prehensile. The first pair of feet is moderately 

 short and stout. The exopodite is three-jointed. The joints bear strong outer edge spines. 

 The last joint is also furnished with two rather long setae. The endopodite is very short and 

 appears to be indistinctly two-jointed. The first joint is very short. The apex of the second 



