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small part of the body of the female was visible, and a male was situated somewhat behind 

 it; there were at least twenty ovisacs, some of them containing eggs, most of them young 

 ones in very different stages of development, and one of them contained perfectly deve- 

 loped larvae. 



31. Sphaeronella marginata n. sp. 



(PI. XIII, fig. 6 a— 6 h). 



FEMALE. The only specimen found (fig. 6a) was -58 mm. long and -39 mm. broad, 

 oblong ovate. The head (fig. 6 d) is not defined from the trunk. A frontal border is rather 

 feebly developed and runs in a slightly curved line from a point a little in front of one 

 to a little in front of the other antennula, and behind this line the skin is sunk and a 

 little softer than in front of it; but lateral borders and lateral skeleton are entirely wanting, 

 and the sub-median skeleton is reduced to a posteriorly geniculate, anteriorly ramified list 

 between the rostrum and the base of each maxilliped. The antennulse (a) are short, with 

 two well separated joints, with a tolerably long seta at one angle of the first joint, a much 

 shorter one at the middle of this joint, and two very short setae at the end of the last 

 joint. Antennae wanting. Hairs of the mouth-border rather long. The maxillulse have 

 very short principal branches ; additional branch wanting. The maxillae (f) are quite rudimen- 

 tary, each consisting only of a very small pointed conical joint, which looks rather like a 

 process. Basal joint of the maxillipeds extremely swollen, especially its proximal part, which 

 on its inner side and on half of its anterior side is furnished with four long, straight, 

 transverse rows of fine, short hairs, while the distal part of its exterior side and the outer 

 part of its anterior side have two transverse rows of similar hairs; second and third joints 

 are coalescent and form together a long and very thick joint, the apical spine of which is 

 very broad and flattened and provided with a number of extremely fine points at its oblique 

 terminal margin; the last joint is short, very broad, dilated towards the flattened end, the 

 oblique terminal margin of which is furnished with numerous very fine points. On the head, 

 a little in front of the base of each maxilliped, are seen rows and stripes of more or less 

 short or long hairs. The trunk is naked. The genital area (fig. 6e) is somewhat broader 

 than long and consists of a thin plate surrounded by a thick border, which is wanting on the 

 greater part of the anterior margin, and its free anterior angles are curved somewhat 

 inward and backward; the plate with curved lateral margins and posteriorly emarginate. 

 The genital apertures are very large, very close together, and their posterior extremity 

 nearly reaches the hind margin of the plate; moreover, they are considerably curved, and 

 their anterior ends are somewhat diverging, their posterior ends very much so, while their 

 muscles are turned obliquely outward and strongly forward. Close behind one of the genital 

 apertures appears a very small caudal stylet, which is furnished with a pair' of very short 



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