STYLOCHEIRON ABBREVIATUM. 281 
Sta. 4679. Dec. 7, 1904. Lat. 17° 26.4’S., long. 86° 46.5’ W. 300 fms. to surface. 3 specimens. 
Sta. 4681. Dee. 8, 1904. Lat. 18° 47.1’S., long. 89° 26’W. 300fms. to surface. 2 specimens. 
Sta. 4685. Dec. 10, 1904. Lat. 21° 36.2’S., long. 94° 56’ W. 300fms.tosurface. 4 specimens. 
Sta. 4687. Dec. 11, 1904. Lat. 22° 49.5’S., long. 97° 30.6’ W. 300 fms. to surface. 1 specimen. 
Sta. 4689. Dec. 12, 1904. Lat. 24° 5’ S., long. 100° 20’ W. 300 fms. to surface. 1 specimen. 
Sta. 4691. Dec. 13, 1904. Lat. 25° 27.3’ S., long. 103° 29.3’ W. 300 fms. to surface. 3 specimens. 
Sta. 4695. Dec. 23, 1904. Lat. 25° 22.4’S., long. 107° 45’ W. 300 fms. to surface. 1 specimen. 
Sta. 4699. Dec. 25, 1904. Lat. 21° 39.5’S., long. 104° 29.8’ W. 300 fms. to surface. 1 specimen. 
Sta. 4705. Dec. 28, 1904. Lat. 15° 5.3’S., long. 99° 19’ W. 300 fms. to surface. 2 specimens. 
Sta. 4707. Dec. 29, 1904. Lat. 12° 33.2’S., long. 97° 42’ W. 300 fms. to surface. 5 specimens. 
Sta. 4709. Dec. 30, 1904. Lat. 10° 15.2’ S., long. 95° 40.8’ W. 300 fms. to surface. 1 specimen. 
Sta. 4719. Jan. 14,1905. Lat. 6° 29.8’S., long. 101° 16.8’ W. 300 fms. to surface. 1 specimen. 
Sta. 4724. Jan. 17,1905. Lat. 11° 13.4’S., long. 109° 39’ W. 3800 fms. to surface. 1 specimen. 
Sta. 4730. Jan. 20,1905. Lat. 15°7’S., long. 117° 1.2 W. 300 fms. to surface. 1 specimen. 
Sta. 4734. Jan. 22,1905. Lat. 17° 36’S., long. 122° 35.6’ W. 300 fms. to surface. 1 specimen. 
ob 
Besides I have it from the following localities :— 
Sta. 3681. Aug. 27, 1899. Lat. 28° 23’ N., long. 126° 57’ W. 100fms. 2 specimens. ‘ Albatross.” 
Fiji Islands. 6 m. South of Suva lightship. Dec. 11, 1897. 150fms. 1 specimen. <A. Agassiz. 
Fiji Islands. 3m. South of Suva lightship. Dec. 11, 1897. 100 fms. 1 specimen. A. Agassiz. 
Fiji Islands. 3m. South of Suva lightship. Dec. 11,1897. 150fms. Ispecimen. A. Agassiz. 
In the “Siboga” paper I pointed out the main differences between this 
species and S. maximum H. J. H. But as no adult male was found in the “‘Si- 
boga”’ material, as the copulatory organs have never been figured, and the inter- 
ésting antennulae in adult males are unknown I give some figures of these 
and other parts with the necessary description; the preservation of the females 
in the collection does not allow corresponding figures of the antennular flagella 
in this sex. 
Fig. 5a exhibits the anterior part of a male. The eye has the shape char- 
acteristic in this species; it is nearly pyriform, the lower area being somewhat 
or a little less than twice as broad, but more than twice as deep as the upper.— 
In the female the antennulae have the two distal peduncular joints slender as 
in the other species of the genus, and the third joint is conspicuously, though 
not much, longer than the second; the flagella are slender with round joints. 
In the male the second and especially the third joint of the antennular peduncles 
is much thickened, the second slightly shorter than in the female, but the third 
slightly shorter than the second and gradually more thickened towards the end. 
The male antennular flagella are very characteristic (figs. 5b and 5c); the upper 
flagellum is somewhat shorter than the peduncle (fig. 5a), 6-jointed; the four 
proximal joints rather slender, but the first a little expanded towards the base, 
the second extremely short, and the fourth is distinctly depressed and begins to 
be a little expanded; the two distal joints together considerably longer than the 
sum of the four proximal joints, flattened, the fifth distally much expanded 
inwards with the inner margin of the broadest part finely serrate, the sixth 
