208 THE SCHIZOPODA. 
a. Carapace in the adults with a denticle on or near the lower margins near 
their posterior end. 
2. Thysanopoda tricuspidata H. Minne Epwarps. 
Plate 4, fig. 2a. 
1830. ~Thysanopode tricuspide H. M1uNE Epwarps, Ann. Se. Nat., 19, p. 454, pl. 19. 
1837. Thysanopoda tricuspidata H. MitNr Epwarps, Hist. Nat. Crust., 2, p. 466, pl. 26, figs. 1-6. 
1885. Thysanopoda tricuspidata G. O. Sars, Challenger Rept., 13, p. 98, pl. 17, p. 165, pl. 31, figs. 1-22 
(larval stages). 
1910. Thysanopoda tricuspidata H. J. HANSEN, Siboga-Exp., 37, p. 82, pl. 12, figs. 3a-3b. 
Sta. 4705. Dec. 28,1904. Lat. 15° 5.3’S., long. 99°19’ W. 300 fms. to surface. 1 specimen. 
Sta. 4721. Jan.15, 1905. Lat. 8° 7.5’S., long. 104° 10.5’ W. 300 fms. to surface. 2 specimens. 
Sta. 4725. Jan.17, 1905. Lat. 11° 38.3’S., long. 110° 5’ W. Surface. 3 older larvae. 
Sta. 4728. Jan.19, 1905. Lat. 13° 47.5’ S., long. 114° 21.6’ W. 300 fms. to surface. 6 specimens. 
Sta. 4729. Jan. 19,1905. Lat. 14° 15’S., long. 115° 13’ W. Surface. 1 very young specimen. 
Sta. 4730. Jan. 20,1905. Lat.15°7’'S., long. 117° 1.2’W. 300fms. to surface. 1 specimen. 
Sta. 4734. , Jan. 22, 1905. Lat. 17° 36’S., long. 122° 35.6’ W. 300 fms. to surface. 2 specimens. 
Sta. 4740. Feb. 11,1905. Lat. 9° 2.1’S., long. 123° 20.1’ W. 300 fms. to surface. 1 specimen. 
To the description given by Sars and that in the “Siboga’’ Report some 
remarks on the maxillulae may be added for comparison with the same organs 
in the following forms. The lobe of first lobe, the proximal lobe (fig. 2a, 1’.) 
is somewhat broad, with the end nearly regularly rounded; the lobe from third 
joint (1°.) is moderately broad, not widened towards the end, about as broad as 
the terminal part of the proximal lobe and considerably narrower than in the 
following species; the fourth joint (4.), the palp, is comparatively large, somewhat 
longer than the lobe of third joint, widening much from the base to beyond the 
middle, more than half as broad as long, with the end almost cut obliquely, 
setose both along the long and the little convex terminal margin, and on the 
outer margin. The pseudexopod (px) is only moderately large, not larger than 
the inner distal, transverse portion of the proximal lobe, very oblong, with 
about its half situated outside the outer margin of the third joint and covering 
only a very small part of the fourth joint. 
Distribution — According to the literature (Sars, Ortmann, Hansen) and 
to the material at hand this characteristic species is common in the tropical 
Atlantic, ranging northwards to the Sargasso Sea (Ortmann); it occurs also 
in the Indian Archipelago and adjacent areas, and it has been taken at various 
places in the tropical Pacific and even more to the southwards in that Ocean 
(Sars). The Copenhagen Museum possesses specimens from more than thirty 
localities, the majority from the Atlantic between Lat. 28° 12’ N. and 22° §., 
but eight among the Stations from the seas around Southeastern Asia, f. inst, — 
Lat. 13° S., long. 103° 20’ E.; Lat. 16° 8’ S., long. 111° 50’ E.; Lat. 16° Ne 
