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qualified to form a character of species. Trunk naked; trunk-legs present. Genital area 

 (fig. 4d) essentially as in the preceding species, for in S. Giardii the chitinised semi-cii-cle 

 can be almost as broad as in S. JBonnieri; the only deviation found is the situation of the 

 caudal stylets wliich in the latter are placed a little more towards the front on the I'ing 

 itself, but whether tliis is a valid character, I am not prepared to decide. 



MALE. Considerably larger than in S. Giardii, two specimens being respectively 

 28 mm. and 29 mm. in length, but they ditter chiefly from that species in the swollen 

 appearance of the trunk, — its volume several times exceeding that of the head - and in 

 a very difterent hair-covering (fig. 1 a and fig. 1 b). Its frontal margin, antennulae, antennae, 

 mouth, maxillulae, maxillae and maxillipeds do not exiiibit really good characters. The fii-st 

 pair of processes of the sub-median skeleton seem to be longer, whereas the second pair are 

 a little shorter than and ditter in shape from S. Giardii. The hair-covering of the lateral 

 border of the head as in this species, but the bordei- itself is shorter and vanishes outside or 

 a little beliind the base of the maxillae, and from this point the boundary line between the 

 naked head and the hair-covered trunk runs upward and backward in a slightly oblique 

 direction across the side and the back. The whole dorsal surface, the sides and the ventral 

 surface, except its foremost pretty considerable [lart, are closely covered all over with simple, 

 moderately long hairs which grow separately (not as in S. Giardii two or thi'ee from the 

 same little eminence); the back without naked transverse area. On account of the swelling 

 of the trunk, the legs and the caudal stylets are much further removed from the lateral 

 and the posterior outline than in nearly all other species, and the caudal stylets are situated almost 

 in the middle of the ventral surface. Both pairs of trunk-legs are proportionally smaller, 

 and their long terminal setae a little shorter than in S. Giardii ; from the peduncle of the 

 first pair of legs outside the outer branch proceeds a distinct process ending in a seta, but 

 the other ditterences in the length of the setae etc. between this and the preceding species 

 are of slight or no value. 



(Tlu-ee, but not the fourth, of the males found are more or less closely wrapped up 

 in long, fine threads, or rather, it looks as if a tlu-ead were wound i-ound the body in 

 numerous curves and with projecting nooses, but I have tried in vain to find out the origin 

 and nature of these remarkable threads. Fig. 4 b exhibits one of the chjsely wrapped 

 specimens.) 



OVISACS. These are oval or shortly oval (fig. 4c), a little larger than and with 

 somewhat larger eggs than in *S^. Giardii, otherwise as in this species. The ovisac repre- 

 sented (fig. 4 c) is '53 mm. long and '43 mm. broad. 



LARVA and POST-LARVAL DEVELOPMENT. Unknown. 



HABITAT. Protomedcia fasciata Kr. from West-Greenland. I have found it in 

 old specimens which were determined by Krciyer, but unfortunately I neglected at the time 

 to put down statistics about the number of hosts etc. of the parasites found, viz.: one adult 

 female, one half-grown female, one very small female, one male without surrounding thi-eads 



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