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

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

 can he almost as hroad as in S. Bonnieri; the only deviation found is the situation of the 

 caudal stylets which in the latter are placed a little more towards the front on the ring 

 itself, but whether this 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, butr they differ chiefly from that species in the swollen 

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

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

 mouth, maxillulae, maxillae and maxillipeds do not exhibit really good characters. The first 

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

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

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

 a little behind 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 part, are closely covered all over with simple, 

 moderately long hairs which grow separately (not as in S. Giardii two or three 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 differences in the length of the setae etc. between this and the preceding species 

 are of slight or no value. 



(Three, 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 thread were wound round 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 closely 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. Protomedeia fasciata Kr. from West-Greenland. I have found it in 



old specimens which were determined by Kroyer, 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 threads 



18 



