92 



joint terminating in a short spine. The maxillipeds comparatively short and slender, their 

 basal joint almost shorter than that of the maxillae. The proximal section of the abdomen 

 more than three times broader than the distal section (fig. 2 i) ; each of the oblong caudal 

 stylets furnished with four setae, the foremost of which is the longest. — Fig. 2 a shows 

 that this specimen possessed two long frontal threads (s), the proximal parts of which are 

 united into one single thread. 



MALE. The largest specimen (fig. 2 k and 2 1) measures to the extremity of the 

 caudal stylets '27 mm. in length; breadth '24 mm.; a rather considerable size compared 

 with the female (fig. 2 b : fig. 2 a). So, the body is proportionally only a little longer than 

 broad and somewhat depressed. The ventral surface outside the limbs from the base of the 

 antennulse to the abdomen, the posterior part of the sides, the hindmost part of the back, 

 the stout basal part of the trunk-legs and the inner branch of the first pair, are closely 

 covered with peculiar, very irregular eminences, which are partly shaped like keels, partly 

 like knots or short, acute taps. The median part between the maxillipeds and the trunk- 

 legs shows fewer keels and stripes. The dorsal side has very few knots, whereas the front 

 part of the head is covered with numerous blunt knots. The maxillipeds like those of the 

 female. The terminal spine on the inner branch of the posterior legs is strongly curved 

 and hooked. Of the setae of the caudal stylets, the two apical ones are stout and of sub- 

 equal length. — The frontal thread (fig. 2 k, s) a little shorter than the animal, simple, slender, 

 yet somewhat thickened towards the distal end. 



EGGS. Much smaller, but also much more numerous than in the preceding species. 

 In one female were found two somewhat oblong lumps of eggs of about equal size and of 

 irregular shape; they did not show any trace of larvae. One of these lumps is exhibited in 

 fig. 2 c, enlarged to the same scale as the largest female, fig. 2 a, and a comparison of these 

 figures with the male (fig. 2 b) will show the relative size. 



LARVA and POST-LARVAL DEVELOPMENT. Unknown. 



HABITAT. On Stenothoe marina (Sp. Bate) from Norway. The locality cannot 

 be precisely indicated, but, according to Sars, the host occurs along the southern and western 

 coast of Norway up to the Nordland coast (Tjoto). I have only seen two infested specimens 

 lent me by Prof. G. 0. Sars, after whom I have named this remarkable form discovered by 

 him. One of the hosts was a female with marsupium, in which were found an adult female, 

 a very small female and the two afore-mentioned lumps of eggs, one of which, probably by 

 chance, was adhering to the abdomen of the female, whereas the other was free and situated 

 more to the front; the female had attached one of its above-mentioned frontal threads to it, 

 which I think shows that the animal must have moved after deposing this lump. The other 

 host was also a female; its marsupial plates were somewhat smaller, though they appeared 

 to be quite developed, being furnished with marginal setae, and in this specimen were found 

 an adult female, a male and an empty skin of a somewhat smaller male. 



