187 



I. Aspidoecia Normani Giard and Bonnier. 



(PI. XII, fig. Sa-311) 1 ). 



Aspidoecia Normani Giard and Bonnier, Compt.-rend. de l'Acad. d. Sciences, 29 avril 1889. 



— — Giard and Bonnier, Bull, scient. de la France et de la Belgique, T. XX, 1889, 



p. 342 etc., pi. X— XI. 

 — Giard and Bonnier, Bull, scient. d. I. Fr. et d. 1. Belg. T. XXV, 1895, p. 479. 



FEMALE. The specimen represented in fig. 3b is an adult female (with two 

 rudimentary ovisacs and three attached larvae) , which is -65 mm. long and -75 mm. broad 

 and is attached to Er. serratus G. 0. S. ; the specimen represented in fig. 3 c and taken on 

 the same species (with two males, x, hinged by frontal threads) is '536 mm. long and - 685 mm. 

 broad; the individual drawn in fig. 3f and fig. 3g and found on Er. abyssorum G. 0. S. is 

 •82 mm. long, 1-03 mm. broad and one of the largest in hand. Fig. 3h shows the head, 

 seen from below, cleaned with caustic potash, so as to show the antennulae, whereas fig. 3 d 

 shows the head partly in front, as it is attached to the female by a large adhesive plate 

 (s) which covers the antennulae. Far to the front on the head, beneath the skin, and far 

 apart from each other appear a pair of peculiar rather large hollow spaces (t) with a strange 

 refraction of light, somewhat like that of a viscous substance, but what they are meant for 

 I cannot make out. In the specimen cleaned with potash the antennulae (fig. 3h, a) are seen 

 to consist of one single, comparatively broad joint with convex inner margin, whereas the 

 outer margin is furnished with several short setae. In most individuals the genital rings 

 are closer together than the length of the diameter of each (fig. 3 e) ; in the larger, but not 

 in the smaller, younger specimens living on Er. abyssorum, they are further apart than 

 this line (comp. the remarks below). 



MALE. The smallest specimen from Er. serratus is '138 mm. long (fig. 31), another 

 specimen from the same species is - 147 mm. long and 120 mm. broad (fig. ok); a specimen from Er. 

 abyssorum is -158 mm. in length. The frontal border is strongly produced in all specimens 

 and slightly emarginate in the middle. The frontal thread is even, though a little expanded 

 at its distal end; in the specimen drawn in fig. 3k, it is scarcely half the length of the 

 body, in another specimen (fig. 3 a, m) between twice and three times the length of the animal. 



OVISACS. Mentioned in the diagnosis of the genus. 



LARVA. Of larvae I have found only a few specimens, one of them attached at 

 the front to the carapace of a host (fig. 3 a, 1), the others fastened to females, and about to 

 develop into males. So the shape of a free specimen cannot be described. Proportionally 

 the cephalothorax of the attached specimens is not broad; in one of them its breadth is 

 •12 mm., the length of the body -20 mm. Antennulae 3-jointed, the olfactory seta about half 

 the length of the cephalothorax , minus its free segment (fig. 3 m). Antennae fairly short, 



On pi. XII the name of the species is written Normanni instead of Normani. 



24* 



