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margin, the second joint tolerably short, the third one of about medium length, smooth, and 

 in the specimen drawn, as well as in other larvae taken out of the same ovisac, this joint 

 is curved forward in the same way as in the hinged specimens of other species. The basal 

 joint of the maxillipeds is long, the second joint a little shorter than the third; the fourth 

 joint has five or six setiform processes along the central part of the inner margin. The 

 peduncle of the natatory legs is rather slender. The abdomen of medium length; the first 

 segment somewhat longer and broader than the second, and the setae of its posterior angles 

 reaching only a little beyond the caudal stylets; the third segment somewhat narrower and 

 shorter than the second; the caudal stylets well set off, their setae unusually short, not nearly 

 half the length of the cephalothorax. — Eig. 2i shows a larva in the act of changing into 

 a pupa (or a male?); it is represented in a dorsal view; the cephalothorax is short and broad; 

 the outline of the contents is shown by an inner line. 



POST-LARVAL DEVELOPMENT. Unknown. 



HABITAT. The marsupium of Erythrops abyssorum G. 0. S. from Norway. In a 

 specimen without indication of locality (bearing a specimen of Aspidoecia), occurred a large 

 female with fifteen ovisacs of widely differing sizes, as well as a considerable lump of empty 

 ovisacs, which could not be counted; no male. In another specimen without locality (with 

 two small specimens of Aspidoecia), appeared one female with fourteen ovisacs, extremely 

 varying in size, and a great deal of them adhering to each other, one of them being empty; 

 moreover, a female glued to an ovisac; no male, but the above-mentioned small female of 

 Mys. commune. In a specimen from Kvalo (bearing one large and four small specimens of 

 Aspidoecia on its carapace), occurred one completely torn female with twelve fine, almost 

 equally large, mostly short and broad, somewhat flattened ovisacs, which on account of 

 mutual pressure were somewhat polyhedrous in shape ; among them were found a male, also 

 the head and the skin of the anterior fourth part of the trunk of another female, and to 

 this skin were attached five males and the broad larva represented in fig. 2i; furthermore, 

 I found two good normal males and the two above-mentioned dwarfish males, which were 

 fastened to the marsupial plates by their frontal threads, — which makes altogether ten 

 males — ; finally four broad larvae which had no doubt been hinged, and the contents of 

 which were undergoing the transformation. 



VI. Aspidoecia Giard and Bonnier (1889). 



FEMALE. The body is considerably broader than long. The head, which is pretty 

 well defined, occupies a somewhat different position relatively to the genital apertures, from 

 that of the earlier forms : in fig. 3 c the genital apertures in relation to the head are placed 



