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crest strong but rounded, extending to su- 
perior margin of chela. Palmar groove short, 
well defined on lower side. Inferior crest 
strong but rounded, terminating distally in 
small, subacute tooth. Inferior depression 
deep, shoulder abrupt but rounded. Dactylus 
less than 0.3 length of chela, closing almost 
across end; with high crest proximally, dis- 
tally expanded to appear bulbous. Chela with 
sparse, scattered setae distally, especially near 
fingers. Merus 2.2 times as long as broad, 1.7 
times as long as broad across maximum 
breadth, 0.8 height of palm; superior distal 
margin produced but rounded, inferior inter- 
nal margin with 7 short movable spines and 
poorly developed distal tooth. Inferior sur- 
face of ischium with 4 spines. 
Small cheliped almost equal in total length 
to large cheliped, small chela about 0.75 as 
long as large chela. Chela 4 times as long as 
broad in female, 3.5 times as long as broad in 
male, fingers occupying 0.6 of length. Palm 
subcylindrical without pronounced sculptur- 
ing; articulation of dactylus flanked by acute 
teeth on each side; plaque crest slight, 
rounded. Fingers slightly broadened with tips 
crossing. Carpus with short, broad, rounded 
tooth on upper distal margin. Merus 3 times 
as long as broad in female, 2.2 times as long 
as broad in male, with 9 irregularly placed 
movable spines and small distal tooth on in- 
ferior internal margin. 
Second legs lacking in type specimen. On 
paratypes, carpal articles with ratio 10 : 5-6 : 
3-4 : 5-6 : 5-6. Chela about 0.8 length of first 
carpal article. 
Ischium of third legs with strong movable 
spine. Merus 5 times as long as broad, un- 
armed. Carpus 0.6 length of merus, with su- 
perior margin projecting distad as acute tooth. 
Propodus almost 0.8 as long as merus, with 11 
spines on inferior and distal margins. Dac- 
tylus 0.2 as long as merus, about 3 times as 
long as broad at base, curved, tip simple, su- 
perior surface with 2 notches. 
Telson short and broad, length only 1.2 
times breadth at base, breadth at tip 0.6 that 
of base. Lateral margins slightly convex; pos- 
terior margin very slightly arcuate. Postero- 
laterally with only one pair of short spines; 
larger dorsal spines about 0.55 and 0.8 dis- 
tance from base. 
Maximum size: 33 mm. (type specimen). 
DISCUSSION: Only slight variation was noted 
in seven specimens of this species available. 
There was the usual and expected variation in 
the proportions and lengths of appendages: 
in some the stylocerite was slightly shorter 
than the first antennular article, and in some 
it was as long; the length of the lateral spine 
of the basicerite also varied within narrow 
limits; the proportions of the large chela it- 
self were quite constant, but the merus of the 
large cheliped was somewhat more variable in 
length, breadth, and armature, with the in- 
ferior internal tooth more highly developed 
in some than in the type; the small cheliped 
appeared to show the slight sexual dimorph- 
ism described above; the limits of the ob- 
served variation in the carpal articles is given 
above; the merus of the third legs ranged to 
almost six times as long as broad in some 
specimens; the number of spines on the pro- 
podus was as high as 11; the dactylus may 
have one to three superior serrations, and in 
some cases one of these serrations was devel- 
oped into a lobe-like extension on the anterior 
surface; the telson was considerably more nar- 
row and elongate, but still preserving the basic 
form. 
The species is named in honor of the 
steamer "Albatross” of the United States Fish 
Commission which collected the type speci- 
mens in 1902. 
relationship: This species plainly is close- 
ly related to C. hailstonei and its varieties; 
therefore it has been included in Table 2. 
There are a series of minor characteristics that 
would aid in the separation of this species 
from the varieties of C. hailstonei and C. hrachy- 
merus, but the most important ones are found 
in the large chela, in which the crest leading 
to the plaque is rounded instead of sharp and 
the dactylus has a bulbous end instead of a 
