EUCHAETOMERA TYPICA. 199 
spine included; the penultimate pair of spines considerably longer than the 
terminal pair, twice as long as the antepenultimate pair and nearly as long as 
the breadth of the telson at their insertion. 
Length of both sexes 6.4 mm. 
Remarks.— This species is a little smaller than G. indicus, but so closely 
allied that it might be considered a variety if it did not show the very marked 
difference in the third pair of male pleopods; the rather short, triangular process 
turning essentially outwards from the thick basal part twice as long as broad 
seems to be an excellent specific character, as this part differs very much in 
aspect from the corresponding portion in G. indicus, in which the thickened 
part is much shorter and the process much longer and directed much backwards 
or parallel with the exopod (Siboga-Exp., Pl. 8, figs. 2k and 21); unfortunately 
the distal part of that exopod is wanting. The peduncles of the three anterior 
pairs of pleopods are more slender than in G. indicus. 
_ All five adult females have a parasitic Isopod in the marsupium, probably 
a species of Prodajus, and allied to P. ostendensis Gilson which inhabits the 
marsupium of the European Gastrosaccus spinifer Goés. 
EUCHAETOMERA G. O. Sars (1883). 
To this genus Brutomysis Chun and Mastigophthalmus Illig ought to be 
referred. That Brutomysis must disappear is certain, as its single species, 
B. vogtii Chun, is without doubt asynonym to E. typicaG.O.S. And Mastigoph- 
thalmus does not show any difference from Euchaetomera of real generic value, 
as the appendix at the eye-stalks is rather developed in E. typica, and the spinu- 
lation, length of flagella, etc., are only specific characters. 
Three species, all captured in 1904-1905, are represented in the collection, 
and one among them is new. 
19. Euchaetomera typica G. O. Sars. 
Plate 2, figs. 5a-5e. 
1883. Huchaetomera typica G. O. Sars, Forh. Vid. Selsk. Christiania for 1883, no. 7, p. 42. 
1885. Euchaetomera typica G. O. Sars, Challenger Rept., 18, p. 211, pl. 37, figs. 1-20. 
1896. Brutomysis Vogtii Chun, Bibl. Zool., 7, heft. 19, p. 179, taf. 15. 
1906. ?Euchaetomera limbata Iuur1G, Zool. Anz., 30, p. 203, fig. 19, A-D. 
Sta. 4734. Jan. 22,1905. Lat. 17° 36’S., long. 122° 35.6’ W. 300 fms. to surface. 2 specimens. 
As the two specimens, a female with marsupium and an immature female 
(together with a third specimen from the Atlantic) differ considerably in a 
