171 



(Kr.). Hitherto tbuiid only in the Kara Sea, tlie Muniiau Sea, near Troniso (Norway) and 

 ott' the West-coast of Grreeiihmd, and the genus has been found only on Hipp. Gaimardii 

 M.-Ed\v. and Hipp, polaris (Sab.). 



REMARKS. Tlie genus contains only two species. As, in spite of the most careful 

 investigation, tlie male has not been found, our knowledge is defective in an important point. 

 Judging trom the structure of the female, the ovisacs, the larva and the pupa, the genus 

 comes very near to SplKeroneJJa, and the only reaUy good character appears to me to be 

 the rudimentary maxillipeds of the female. A biologically important character is that — as 

 stated above — it lives in the branchial cavity of Decapoda Caridea, as the genus Homoeo- 

 scelis lives in the branchial cavity of Cumacea. 



Conspectus of the Females. 



The fi'ame of the head is an almost regularly transverse oval and provided exteriorly on 

 each side with a very long list which proceeds from the centre of the lateral outline and runs 

 outward, and especially backward, in an oblique direction 1. Ch. mirahile H. J. H. 



In the frame of the head the foremost lateral angle is strongly produced, forming a 

 good-sized, fairly broad and not quite short projection, a large part of which is covered by 

 the skin, whereas the very long lateral, essentially backward running list mentioned in the 

 preceding species is wanting . . . . 2. Ch. Hansenii Giard and Bonnier (without description). 



I. Choniostoma mirabile H. J. H. 



(PI. X, fig. 5a— 5c; pi. XI, flg. 1 a— Ik.) 



Choniostoma mirahile H. J. Hansen, Dijmphna-Togtet.s zool.-bot. Udbytte, 1 887 ^), p. 271—78, Tab. XXIV, 



fig. 7-7 h. 



— — Giard and Bomiier, Bull, sclent, de la France et de la Belgi([ue, T. XX, 1 889, p. 340, etc. 



— — Giard and Bonnier, Bull.scient.de laFr. ef d. 1. Belg. T. XXV, 1895, p. 479. 



FEMALE. The specimen represented in fig. 5 a is 3-.5 mm. in length, 4 mm. in 

 breadth; its shape is described in the diagnosis of the genus. The smallest specimen found 

 is a young one, 1-35 mm. long and 1-28 mm. broad, thus a little longer than broad, almost 

 circular in appearance, and somewhat flattened like the adidt. The area surrounded by the 

 frame of the head (flg. la) is regularly rounded, somewhat shoiter than broad; the anterior 

 part of the ii-ame is fairly narrow between the antennulae, scarcely rising above the surroun- 

 ding soft membrane and exWbiting outwardly only a very narrow list, while its broader 

 part (indicated by a dotted Une) is covered by the skin. The lateral and posterior parts of 



') Separate copies of my contribution were distributed in the beginning of July 18S6, whereas the whole 

 volume with the resume appeared in 1887. 



22* 



