222 THE SCHIZOPODA. 



East Pacific, I think it natural that young in the same stage of development 

 from the two Oceans differ also somewhat in size. 



Distribution. — The Monaco specimens were captured in the Eastern Atlantic 

 more or less remote from Southern Spain; Ortmann's specimen was taken in 

 the Northern equatorial current, and Illig's young was from the Benguela cur- 

 rent, West of Angra Pequena. The list above shows that the distribution in 

 the East Pacific is similar to that of T. aequalis or T. obtusifrons. 



8. Thysanopoda orientalis H. J. Hansen. 

 Plate 5, figs. 2a-2i. 



1910. Thysanopoda orientalis H. J. Hansen, Siboga-Exp., 37, p. 85, pi. 13, figs. 2a-2i. 



Sta. 4709. Dec. 30, 1904. Lat. 10° 15.2' S., long. 95° 40.8' W. 300 fms. to surface. 4 specimens. 



Sta. 4717. Jan. 13, 1905. Lat. 5° 10' S., long. 98° 56' 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. 1 specimen. 



Sta. 4722. Jan. 16, 1905. Lat. 9° 31' S., long. 106° 30.5' W. 300 fms. to surface. 5 specimens. 



Sta. 4740. Feb. 11, 1905. Lat. 9° 2.1' S., long. 123° 20.1' VV. 300 fms. to surface. 1 specimen. 



A description is found in the paper quoted, but notes on the maxillulae, 

 maxillae, and copulatory organs may be added here. 



The maxillulae (figs. 2a-2b) are quite similar to those in T. obtusifrons 

 G. O. S., but differ in minor particulars. The proximal lobe is distally a little 

 more rounded; the distal lobe, though increasing strongly in breadth towards 

 the end, is almost as long as broad or a little broader than long; the palp is 

 somewhat or considerably shorter than the distal lobe, slender; the pseudexopod 

 is very large, yet smaller than in T. obtusifrons, rather far from reaching the end 

 of the distal lobe. — The maxillae (fig. 2c) are somewhat elongate, with the 

 terminal — the fourth — joint considerably longer than the third and more 

 than half as long again as broad. Fig. 2c shows besides the morphological 

 composition of a maxilla in the present order of Crustacea. 



The copulatory organs (figs. 2d-2i) show various fine features. The spine- 

 shaped process is somewhat or considerably curved, of the normal shape. The 

 terminal process is somewhat long, moderately strong, feebly curved, tapering, 

 seen from behind (fig. 2d), from the base to rather near the end where it widens 

 feebly and has the end itself rounded, but seen in the main from in front (fig. 2e) 

 the terminal part is perceived to be somewhat widened and excavated, spoon 

 shaped. The proximal process is very long, much longer than the terminal; 

 its short proximal part is rather thick, then it is curved nearly abruptly inwards, 

 but no "heel" is developed, and the process forms now nearly half of a circle, 

 with the convex side turning inwards; from the proximal bend to a little from 



