117 



not been closely examined). Two specimens are from »lat. 49° 30' N., long. 142° 8' E., 

 Sartung in Sachalin, Andrea, 1869 «; they have not been closely examined. One specimen 

 is from »lat. 51 °N., long. 141° 20' E., »in sea-weed«, Andrea, 1869«, and in its marsupium 

 were found: one female, five males and eight ovisacs (none of them containing developed 

 larvae). — In several specimens the marsupium was very much extended by the parasites; 

 the hosts were always sterile. 



REMARKS. The female is easily recognised by its hair-covering and its peculiar 

 genital area; the male differs from all other species by its crenate frontal margin and by 

 the peculiarly dotted surface of the back and the sides of the trunk. 



With regard to the determination of the host, I will add that I myself was incapable 

 of distinguishing the numerous specimens from East Asia from G-reenlandish specimens; there- 

 fore I sent some of the non-infested Asiatic specimens to Prof. G. 0. Sars, who in his new 

 important work about the Norwegian Amphipoda, writes on p. 450, that he was unable to 

 distinguish them from the Norwegian Call. lesviusculus. So it is interesting that I have 

 found no parasite in specimens from Greenland, nor in any of the very numerous Danish 

 specimens which have been referred to this species, but it must be observed that in Sars' 

 opinion these animals belong to Call. RathJcei (Zadd.), about which, however, Sars himself 

 does not seem to be absolutely certain, whether it can be maintained as a species. 



10. Sphaeronella irregularis n. sp. 



(PI. XIII, fig. 5 a— 5 d.) 



FEMALE. The only specimen found (fig. 5 a) was -73 mm. long and '59 mm. broad; 

 the body is ovate, the head tolerably defined. The sub-median part of the frontal margin 

 furnished with a number of moderately long hairs. (The antennulae broke off under the 

 preparation). The antennae 3-jointed, with a terminal seta (which broke off). The maxillae 

 normal. The maxillipeds with all four joints distinctly separated; the basal joint naked, the 

 terminal joint with trifid apex. The sub-median skeleton consists of narrow lists, and a 

 distinct, centrally uninterrupted, list runs between the head and the trunk; between the 

 base of the maxillae and the maxillipeds runs a pretty long transverse stripe of long hairs. 

 The lateral margins of the head with a thin row of moderately long hairs. The whole 

 surface of the trunk is rather sparingly trimmed Avith peculiar hairs, which consist of a very 

 small but comparatively tluck basal part, from which proceed two, sometimes three hairs, of 

 which the one proceeding from the centre of the basal part is always much longer than the 

 other or the two others. The trunk-legs are distinct. The genital area (fig. 5 d) in my 

 only specimen is so irregular in shape that it must be misshaped; it is a little narrower 

 than the base of the head, most of its median part is thin-skinned, the more solidly chitinised 

 part forming a kind of heart-shaped ring with an opening to the front. The genital aper- 



