1903. ] IN THE ‘CHALLENGER’ COLLECTION. 67 
each of the two stations mentioned ; and I suppose, therefore, that 
both specimens have later on been put together in the same tube. 
Both specimens, which are in a very bad condition, belong eprrectly 
to S. longispinus Bate (the direction of some of the dorsal spines 
on the abdomen is very characteristic), and this form is in reality 
the Mastigopus of S. cornutus Ky. (compare my earlier paper, 
p- 953). 
SERG. PENERINKII Bate, p. 418, pl. lxxvi. fig. 3. 
Bate records the length to be 8 mm. and the locality ‘* North 
Atlantic Ocean.” No specimen referred to this species could he 
found in the collection. But above I have mentioned a specimen 
of this species referred by Bate to S. rinkii, and it may perhaps 
be that described by him as S. penerinkii. He writes (p. 419) 
that the last-named “species bears a strong resemblance to 
Sergestes rinkit Kroyer, but differs . . .”.. The specimen in question, 
referred by him to S. rinkii, measures nearly 7mm. in ype and 
was captured ‘“ 25. 8.73,” that is to say, Mid Atl 
earlier paper I have described the JJastigopus, and ae the 
mature form as S. penerinkit Bate, H. J. H.; but above it is 
pointed out that this name must be cancelled as a synonym, and 
the species be named S. diapontius Bate, H. J. H. 
SERG. FERMERINKILE Bate, p. 419, pl. Ixxvi. fig. 4. 
Bate has examined one specimen, captured in the ‘ Pacific 
Ocean, lat. 24° 8., long. 148° W.,” and measuring 5mm. The 
specimen is not to be found in the Museum collection. According 
to the figure it is a very young Mastigopus belonging either to 
S. diapontius Bate, H.J.H., or toa closely-allied species of the 
same group. 
SERG. LONGICOLLUS Bate, p. 421, pl. Ixxvii. fig. 1. 
Bate enumerates two localities. The first of them is “ South 
Atlantic Ocean, October 5, 1873; near Station 131 i lat. 29° 35° 
S., long. 28° 9' W.” In a preparation labelled “5.10.73” I 
found the large specimen drawn by Bate; in a tube labelled 
“surface, at night, 5 Oct. 1873, South Atlantic,” a small specimen 
was preserved. Thus both specimens are from the first locality 
in the text, and both belong to S. longicollus Bate, which is the 
Mastigopus of S. tenuiremis Kroyer, H. J. H. In the large 
specimen drawn by Bate the eyes present a thick yellowish layer 
around the black central part; the dorsal spine on the sixth 
abdominal segment is exceedingly small. 
The second locality in Bate’s text is ‘‘ Station 295, November 5, 
1875; lat. 38° 7'S., long. 94° 4" W.; South Pacific Ocean ; depth 
1500 fathoms; ... Taken at night.” In the collection a specimen 
is preserved labelled “5. Nov. 75, night, 8. Pacific, surface.” 
The determination is correct; and the specimen, which measures 
9-2 mm. in length, is evidently that mentioned by. Bate; but 
the label proves that it was taken at the surface, wherefore 
~ 
5* 
