V22 



the lower suiface of tlie body, but was lost before I could get it drawn. The trunk is 

 naked; I have found no trunk-legs, but they probably exist nevertheless. The genital area 

 (fig. 2c) is nuich nairower than the head and consists of a plate well chitinised all over, 

 which is about one half broader than long, with flatly convex anterior margin and deeply 

 concave posterior niai-gin ; the genital apertures oblique, the distance between them moderately 

 large (in the drawing they are both open) and two long-stalked spermatophores are shown, 

 as well as half the stalk of a third one. The caudal stylets (one of them is torn off) are 

 situated close together on the smooth membrane adjoining the posterior margin of the plate; 

 the latter and its surroundings are naked. 



MALE. A good specimen is ■25 mm. in length, and the body seen from below 

 (fig. 2d), is regularly ovate. Compared with the female it is about middle-sized (fig. 2b : fig. 2a). 

 The head is considerably larger than the trunk. The front is not strongly produced, its 

 anterior margin is evenly rounded and naked. The antennulse are tolerably strong, the 

 terminal setae short. The antennas are long, 3-jointed, the conical terminal seta the length 

 of the last joint. The mouth is small. The maxillulae with an additional branch of medium 

 length. The basal joint of the maxillae has a conical process whei-e the posterior and 

 the inner side meet. The basal joint of the maxillipeds is long and naked, the three other 

 joints distinctly separated. The sub median skeleton with the first pair of pi'ocesses not 

 developed, the second pair are long, somewhat diverging and feebly curved. The lateral 

 margin of the head has only very few hairs; somewhat before reaching its posterior angle 

 the hair-covering expands a little, then continues as a thin fringe upward and backward in 

 a very slanting line across the back, leaving only a small dorsal part of the trunk to be 

 seen behind it. On the back, close behind this fringed line, is a considerable naked area, 

 so that only the hindmost extremity of the trunk, the larger part of its lateral surface and 

 the ventral surface between the legs have a rather thin covering of moderately short hairs. 

 At the back and the sides we see empty spaces beneath the skin similar to those in 

 S. paradoxa. The first pair of trunk-legs are rather long; the clumsy peduncle is continued 

 in a pretty long and clumsy outer branch, while the inner branch is a short cone; the 

 former terminates in two setae, one of which is considerably longer than the whole leg, nay 

 even longer than the basal joint of the maxilliped, whereas the other seta is about three 

 times shorter; the inner branch ends in a long seta which is a little shorter than the basal 

 joint of the maxilliped. The second pair of legs are moderately long, unbranched, ending 

 in two setae, one of which equals in length the short seta on the outer branch of the first 

 pair of legs, whereas the second somewhat exceeds in length the long seta of the last- 

 mentioned outer branch. The caudal stylets are of medium length, their terminal seta even 

 somewhat longer than any of the other setie, and measuring nearly two thirds of the length 

 ofthe whole animal. — The frontal thread in the specimen drawn in fig. 2d is a little longer 

 than the animal, veiy fine, and feebly expanded at its distal end. 



