68 DR. H. J. HANSEN ON CRUSTACEANS [Jan. 20, 
the depth recorded in the text is most misleading.—In a third 
tube two specimens labelled 18/10 75 were preserved; they had 
been correctly referred by Bate to his S. longicollus, but are not 
mentioned in his text. 
A preparation contained a specimen of the same species, 
labelled ‘“ Sergestes tenwiremis, South Atlantic, 6.10.73.” It is 
not mentioned by Bate, who even writes (p. 421) that ‘“ No speci- 
men in the ‘Challenger’ collection corresponds precisely with the 
description and figure given by Kroyer” of S. tenwiremis. On 
the other hand, S. tenwiremis Kr. and S. longicollus Bate are, as 
already stated, the same species. 
SERG. PRECOLLUS Bate, p. 423, pl. Ixxvil. fig. 2. 
Bate has examined one specimen, measuring 25 mm., from the 
“North Pacific Ocean.” The specimen could not be found. 
The shape of the eyes in Bate’s figure shows that it has been a 
large Mastigopus. In my earlier paper I write (p. 958): “is at 
least rather nearly related to S. corniculwm Kr., from which it seems 
to differ by a somewhat different shape of the ext. br. of urp., 
and by having the fifth abdominal segment ‘dorsally produced to 
a point.’” 
SerG. semrarmtis Bate, p. 423, pl. Ixvii. fig. 1. 
Bate has two localities: ‘“‘ West Pacific Ocean” and “ Station 
oan May iG UISiO is)... Maids NorchieAtlamties 70) Auber mulme 
description he writes: ‘ Observations——A specimen (pl. Ixvii. 
fig. 2) very similar to the type was taken in the Atlantic ...”; 
and then he describes the specimen. I must suppose that he 
considered the specimen from the ‘“ West Pacific Ocean” to be 
the type of his S. semiarmis, and that the specimen described 
separately (p. 425) is that from “... May 6, 1876....” Neither 
of the specimens could be detected in the Museum; both are 
larve, but a reference is impossible. In the collection I found 
one specimen determined as S. semiarmis and labelled “13 April 
1876, Atlantic, off coast of Africa, surface”; it is a MJastigopus 
of S. diapontius Bate, H. J. H. 
SERG. LAVIVENTRALIS Bate, p. 425, pl. Ixvii. fig. 3. 
Bate had probably only one specimen, 7 mm. in length, from 
“North of New Guinea”; it could not be found in the Museum. 
It isa young Mastigopus belonging to a species closely related to 
S. arcticus Kr. 
SERG. SPINIVENTRALIS Bate, p. 426, pl. Ixvii. figs. 5 & 6. 
Bate has only one locality: “North Pacific Ocean”; the 
animal described measured only 3-5 mm. in length, and some of 
its parts are shown in figs. 5a, 51, and 5v, but fig. 5 v, repre- 
senting the ext. br. of urp., does not correspond at all with the 
description in the text (p. 427). The animal is not to be found 
in the collection: it is a small Mastigopus related to S. vigilax 
Stimps. and allied species. Bute’s fig. 6a represents the head 
