666 ON CRUSTACEA BROUGHT BY DR WILLEY FROM THE SOUTH SEAS. 



to fit neatly into the strong emargination of the third thoracic segment of the female, 

 might easily be mistaken for a single animal, were not a warning given by the caudal 

 setae of the female, which jjroject from below the male, apart from his caudal 

 appendages. One of these couples has a rather remarkable appearance. Besides her 

 two packets of eggs, the female has, on one side of the genital segment, two curved, 

 narrow, cylindrical bodies, rather longer than that segment, possibly spermatophores. 

 But along with these there is another cylinder, transversely striped, as broad as the 

 end of the female pleon and nearly equal to the whole length of her body. 



The specimens were labelled " Copepod ectoparasites from Blue Linckia. Light 

 blue-coloured alive." 



Habitat. Feather Island, China Straits, New Guinea. 



The specific name refers to the colour. The species bears in some respects a 

 striking resemblance to some members of the Asterocheridae, but it is without some 

 of the distinguishing features of that group (see Giesbrecht, Fauna und Flora des 

 Golfes von Neapel, Mon. 2.5), having no aesthetask on the first antennae, and, instead 

 of having the eggs large and few (at most 20), having them small and numerous, 

 reaching as above stated a hundred in number. 



Panaietis, n. gen. 



Head large, widening backwards, rest of the body tapering, the five leg-bearing 

 segments distinct, the four following separated from one another by constrictions rather 

 than definite boundaries ; the whole animal flat. First antennae seven-jointed. Second 

 antennae two-jointed, with apical hooks. Mouth-organs (seemingly) laminar. The first 

 four pairs of legs bii'amous, each ramus three-jointed ; the fifth pair single-jointed, 

 cylindric. The caudal appendages slender, about a seventh of the total length. 



This genus seems to make a near approach to Anthessius, Delia Valie, and 

 Paranthessius, Glaus, but it is distiuguished by having the first thoracic segment 

 completely divided from the head-shield. 



Panaietis ixcamerata, u. sp. 



Plate LXX E. 



Head with slightly convex front and sides, hind margin nearly straight, breadth 

 greater than the length. First leg-bearing segment broader but shorter than any of 

 the following segments ; the fifth with lateral dilatations at the middle, and the next 

 with such dilatations at its base ; the latter is the longest of all, the nearest to it in 

 length being the terminal segment, which is rather longer than the head, and has a 

 small apical clelt. 



The first antennae are moderately stout, smooth, the second joint not thicker than 

 the first, but' considerably longer, the third joint short, the fourth thicker than the 

 fifth, but scarcely so long, about equal to the last two joints combined. In the second 

 antennae the lower apical hook or nail is stout, the three above it are slender, sinuous. 

 The appearance of the mouth is represented in the figure. It seems fitted only for 

 absorption of very soft or liquid food, but, being observed only in a single specimen. 



