201 



Figure 



4 b. Area on the female answering to the head and showing the antennula; and its oilier organs 



X 122. 

 4 c. Genital area of female, X 68; g. genital aperture, 1-. hole (or very small thin-skinned area 



with minute holes), r. one receplaculum seminis indicated hy a dotted line, witli a stalk of a 



spermatophore, «'., attached to its orifice; s. spermatophore attached to the orifice of the 



other receplaculum which is not drawn. 



4 d. Antennula, antenna, maxilla and maxillipod from the right side of a not quite full-grown larva 



seen from below, X 196. 



5. Choniostoma mirabile H. J. H. 



5 a. F'emale seen from below, X 4. 

 5 b. Ovisac with eggs, X 4. 



5 c. Ovisac with full-grown larvae, X *• (These three figures, fig. 3 a— 3 c, are also found in my 



report in "Dijmphna-Togtets zool.-bot. Udbytte".) 



6. Choniostoma Hansenii Giard and Bonnier. 



6 a. Rostrum of female cut off and seen from right side, X 203; a. membrane of the mouth- 



border, h. hairs of the mouth-border, c. maxillula, c . additional branch of the maxiilula (its 

 distal part is broken off, but indicated by dotted lines). 

 6 b. Larger part of the terminal face of the rostrum shown in fig. 5a, X 321 ; d. labruni, e. mandible. 



PLATE XL 



1. Choniostoma mirabile H. J. H. (continued). 

 1 a. Head of female, X 104; a. antennula, h. olfactory seta, c. antenna, r/. rudimentary maxilliped, 



h. sub-median skeleton, k. frame of the head, k' . lateral process of the frame, k" . chitinous 



knots belonging to the frame and lying partly beneath the soft skin, t. posterior chitinous 



ring, u. anterior chitinous ring. 

 1 b. Genital area of female, X 104; e. solid chitine, r. one receptaculum seminis indicated by 



dotted lines (the other receptaculum is omitted). The genital apertures are open. 

 1 c. Young one in the Nauplius stage seen from left side, X 81. 

 1 d. Young one in the Nauplius stage seen from below, X 81. (Fig. Ic and Id are found in 



'Dijmphna-Togtet".) 

 1 e. Hinged larva, X 210; s. adhesive plate. The setae of the two natatory legs on the left side 



of the figure are omitted. 

 1 f. Anterior part of a full-grown larva pulled out of its egg-membrane, X 261. 

 1 g. Pupa seen from below, 110; a. antennula, s. adhesive plate. Posteriorly and on the sides 



the outhne of the contents is somewhat removed from the margin, and posteriorly arc seen 



the hairs of the animal shining through the skin of the pupa. 

 1 h. Large pupa seen from below, X '^0. 

 1 i. Smaller pupa seen from below, X 40; .s. adhesive plale. The contents marked with a 



greyish tint. 

 1 k. Small pupa seen from below, X 40. 



26 



