%13 



their respective males, a fully grown female with a likewise fully grown male, and 

 a quite young female, with the male still in the Cryptoniscian stage. Both these 

 specimens, of which figures are given on the accompanying plate, occurred on 

 the same species of Eupagurus, viz. E. chiroacanthus, but came from very different 

 localities, the one having been taken oft' the south coast of Norway, the other 

 at Selsovik lying just within the polar circle. Another adult female was found 

 likewise on an E. chiroacanthus taken in the Kattegat by Dr. Petersen, and kindly 

 sent to me for examination. The mode in which the parasite is attached to its 

 host, is exactly as in A. paguri (see the middle figure at the top of the plate). 

 Distribution. — Kattegat (Copenhagen Mus.). 



3. Athelges bilobus, G. 0. Sars, n. sp. 



(PI. LXXXIX, fig.i). 



Specific Characters. — Body of immature female narrow oblong or fusi- 

 form in outline, nearly symmetrical, only very slightly curved to the right; 

 dorsal face convex, ventral concave. Cephalon freely projecting anteriorly, with 

 the frontal margin evenly curved. Segments of mesosome each produced laterally 

 to well-defined, obtuse projections carrying the legs below. Metasome not 

 abruptly contracted, but tapering gradually behind, each of the 4 anterior segments 

 produced laterally to a long conical projection, apparently constituting the outer 

 lamella of the pleopoda, the inner lamella being very §mall and knob-like ; terminal 

 piece with 2 rather conspicuous, juxtaposed tubercles dorsally, tip deeply incised 

 in the middle, or forming 2 lamellar lobes. Male oblong, with the metasome 

 attenuated and rather large, being fully half as long as the preceding part of 

 the body, and showing traces of segmentation, as also rudiments of pleopoda, tip 

 slightly bilobed. Colour not yet determined. Length of the female examined 3.80 

 mm., of male 1.40 mm. 



Remarks. — The present new species, it is true, is only based upon a 

 single evidently immature female specimen together with its male, which perhaps 

 is also not fully developed; but there cannot be any doubt that it is quite di- 

 stinct from either of the 2 preceding species and also from those described by 

 Mr. Hesse. The only form to which it seems to exhibit a closer resemblance, 

 is the Brasilian^Bopyrid recorded by Fritz Miiller as Bopyrus resupinatus. The 

 latter, however, is kept apart from the genus Athelges by M.M. Giard and 

 Bonnier and regarded as the type of a seperate genus, to which they transfer 

 the Rathkian name Phryxus. In my opinion, however, the species of Fritz 



