36 STALK-EYED CRUSTACEA. 
ZETHUSINA Sw»its. 
Ann. Rep. U. S. Fish Comm. for 1882, p. 349, 1884 [Hthusina]. 
Asthusina gracilipes (Mmnrs). 
Bthusa (Ethusina) gracilipes Miers, Rep. Challenger Brachyura, pp. 332, 333, Plate XXIX., 1886. 
Station 3361. 1471 fathoms. 1 fem. 
Ge Sa a.) 823 es males, 2 fem. 
ds 505u ele a6 
i S338: = 1o73 cs 
“« = 3400. = 13822 ee 
Ce a4.07 880 s¢ fem. 
ey a4t3., 1360 ch 2 males, 1 fem, 
In most of these specimens the spine at the antero-external angle of the 
carapace is long, as in the figure of the typical form of Miers’s species, but it 
is bent outward at a sharper angle, as in Miers’s var. robusta. The outer 
spine of the front is longer in proportion to the inner spine, and the carapace 
is rather narrower. ‘The legs are shorter (as in var. robusta), while the chela 
male. 
males, 
male, 2 fem. 
me ke be oO 
is midway in form between the typical gracilipes and var. robusta. 
The “ Challenger” specimens were obtained near the Philippines in 700 
fathoms, in the Arafura Sea in 800 fathoms, and in the Banda Sea in 1425 
fathoms. 
Z&thusina challengeri (Mizrs) ? 
? Bthusa (Bthusina) challengeri Miers, Rep. Challenger Brachyura, p. 331, Plate XXVIII. Fig. 2, 1886.* 
Station 5414. 2232 fathoms. 1 fem. 
Trefer this specimen with some doubt to 4. challengert. The fingers of the 
chelx are longer than in that species, the internal distal angle of the ischium 
of the external maxillipeds is more salient, and the merus more pear-shaped ; 
the front, too, is narrower, the median sinus deeper, and the internal orbital 
angle less prominent. 
I believe that the depth from which this specimen was brought is the 
greatest at which any Brachyuran has ever been taken. 4. abyssicola Smith 
was dredged by the “ Albatross” off the east coast of the United States in 
2221 fathoms. Miers’s specimen of 4. challengeri was obtained from 1875 
fathoms, in Japanese seas. 
* On pp. 329, 332, Miers refers to this species by the name of #. sinwatifrons. 
