THYSANOPODA OBTUSIFRONS. 215 
mens from four localities in the Eastern Atlantic between Lat. 28° N. and Lat. 
23° N., besides from the Central Atlantic at Lat. 5°-7° 15’ N., long. 30° W., from 
Southern Atlantic at Lat. 303° S., long. 223° W., finally from five Stations in an 
area across the more southeastern part of the Indian Ocean, viz. between Lat. 
22)° S. and 273° S., long. 80° E. and 103° E. From the Hawaiian waters (the 
label has Sta. 3808. From between Erben Bank to Kaiwi Channel) I have seen 
nine specimens belonging to this species but referred by Ortmann (1905) to 7. 
obtusifrons G. O. 8. In the area explored in 1904-1905 this species is confined 
to the southern part, not going North of Lat. 93° S.— The specimens in the 
Copenhagen Museum have certainly all been taken at the surface during night. 
6. Thysanopoda obtusifrons G. O. Sars. 
Plate 4, figs. 5a-5f. 
1883. Thysanopoda obtusifrons G. O. Sars, Forh. Vid. Selsk. Christiania for 1883, no. 7, p. 21. 
1885. Thysanopoda obtusifrons G. O. Sars, Challenger Rept., 13, p. 102, pl. 12, figs. 1-14. 
1905. Thysanopoda vulgaris H. J. HANSEN, Bull. Mus. Océan. Monaco, no. 30, p. 15. 
1905. Thysanopoda vulgaris H. J. HANSEN, Bull. Mus. Océan. Monaco, no. 42, p. 20. 
1910. Thysanopoda obtusifrons H. J. HANSEN, Siboga-Exp., 37, p. 81. 
Sta. 4683. Dec. 9, 1904. Lat. 20° 2.4’S., long. 91°52.5’W. 300 fms. tosurface. 7 specimens. 
Sta. 4685. Dec. 10,1904. Lat. 21° 36.2’S., long. 94° 56’ W. 300 fms. to surface. 11 specimens. 
Sta. 4687. Dec. 11, 1904. Lat. 22° 49.5’ S., long. 97° 30.6’ W. / BLD WG. UD SERS 1Y SYEH ES) 
2125 fms. to surface. 3 specimens. 
Sta. 4689. Dec. 12,1904. Lat. 24°5’S., long. 100° 20’ W. 300fms.tosurface. 2 specimens. 
Sta. 4691. Dec. 13,1904. Lat. 25° 27.3’S., long. 103° 29.3’ W. 300 fms. tosurface. 4 specimens. 
Sta. 4695. Dec. 23,1904. Lat. 25° 22.4’S., long. 107° 45’ W. 300 fms. to surface. 2 specimens. 
Sta. 4701. Dec. 26,1904. Lat. 19° 11.5’S., long. 102° 24’ W. 300 fms. to surface. 2 specimens. 
Sta. 4730. Jan. 20,1905. Lat. 15° 7’S., long. 117° 1.2’ W. 300 fms. to surface. 1 specimen. 
Sta. 4732. Jan. 21,1905. Lat. 16° 32.5’S., long. 119° 59’ W. 300 fms. to surface. 2 specimens. 
Sta. 4740. Feb. 11,1905. Lat. 9° 2.1’S., long. 123° 20’ W. 300 fms. to surface. 1 specimen. 
Description The frontal plate (figs. 5a-5b) is considerably produced, 
about twice as broad as long, broadly obtuse, with the front margin rounded 
or a little angular at the middle and somewhat shorter than one of its oblique 
lateral margins; on its end is seen the rostrum transformed as a small, vertical, 
conical tooth or at least a vestige of such a tooth; the plate is thick, longitudi- 
nally concave at the middle, so that a pair of submedian obtuse keels, united 
in front at the rostrum mentioned, is formed, and a little behind the rostrum 
begins a rather low median keel which is highest considerably behind the end 
of the submedian keels and occupies about two fifths of the length of the cara- 
pace. The carapace has a minute, but distinct, denticle on the outer side of 
the lateral margin somewhat before its posterior end, while the produced part 
of the anterior margin above the antennae is only a minute tooth; a furrow 
runs close to the lateral margin along its entire length and bends upwards along 
a portion of the posterior margin, but the carapace has no other grooves. 
