203 



figy^ 2. Mysidion abyssorum n. sp. 



2 a. Huad of female, X 182; a. antennula, e'. additional branch of the niaxillula. 



2 b. Genital aperture and the surrounding skeleton of female, X 123; ff. genital aperture, h. plate 

 formed of a kind of viscous substance and covering the lips of the genital aperture and the 

 skeleton behind them, /. stalks of ovisacs, the basal parts of which are confluent and form 

 the plate mentioned, /.:. hole (or very small thin-skinned area with minute holes) at the 

 anterior end of the skeleton. 



2 c. Male, 43. 



2 d. Very small male with frontal thread, X 43. 



2 e. Normal male seen from below, X 250; e. niaxillula, </. s|)ermatotheca, ii. line of unknown 

 nature. 



2 f. Normal male seen from left side, X 23G; x. conical eminence on the dorsal side of the head. 



2 g. Frontal thread of one of the minute males, X 260. 



2 h. Larva seen from below, X 264. The natatory legs are omitted. 



2 i. Hinged larva seen from above, X 125. 



3. Aspidoecia Normani Giard and Bonnier.^) 



3 a. Male of Erythrops abyssorum G. 0. Sars seen from above and infested with nine female ])arasites 



of very different size and one larva, X ^^2; a. larger female, b. smaller females, l. larva, 



m. male. The posterior part of the abdomen of the host is omitted. 

 3 b. Female with two rudimentary ovisacs (h.) and three larvae (v.) attached to the dorsal surface 



of the second abdominal segment of L'ri/throps serratus G. 0. Sars, X 24 ; ;■'. chitinous knots 



where the entrances to the receptaculum seminis must be found. 

 3 c. Sub-adult female attached to the back of the first abdominal segment of an Er. serratus and 



seen from the dorsal side, X 39; x. two males hinged by their frontal thread, y. part of the 



skin of the host. 

 3d. Head of a female from Er. serratus, seen much from in front, X 350; rf. mouth, ^.niaxillula, 



s. adhesive plate, t. internal space possessing a pecuhar refraction of liglit. 

 3 e. External genital organs and receptaculum seminis of the female whose head is shown in fig. 3 d, 



X 70; e. soUd ring, g. genital aperture, k. hole in the ring, o. chitinous knots, r. receptaculum 



seminis with its ducts. 

 3 f. Adult female from Er. abyssorum, X 24; the head is seen in the middle. 

 3 g. The same male seen from the side opposite of that of fig. 3 f ; r. ring around a genital aper- 

 ture, r'. chitinous knots. 

 3 h. Head of the female shown in the two preceding figures, cleaned with caustic potash and seen 



from below, X 350; a. antennula. 

 3 i. Genital aperture and its surroundings of the female shown in fig. 3f, X 170; e. ring-shaped 



skeleton, f. less soHdly chitinised part of the ring, <j. genital aperture with its lips, k. hole 



in the ring, m. muscles. 

 3 k. Male from Er. serratus seen from below, X 291; b. olfactory seta of the antennula, ry. sper- 



matotheca. (In other specimens two spermatothecaj were found.) 

 3 1. Another male from Er. serratus seen from left side, X 324. 



On the plate is written Normanni instead of Normani. 



26* 



