PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 427 
the eye-stalk and nearly twice as long as the penultimate segment. The 
major flagellum is as long as the ultimate segment of the peduncle, the 
basal portion of about eight segments, the terminal portion three times 
as long and of about five subequal and very slender segments. The 
minor flagellum is about half as long as the major, and composed of 
about six segments. The antenne are very much as in H. socialis. 
The chelipeds are nearly equal in length and similar to those of H. 
socialis, but in the right cheliped the inner edge of the upper surface of 
the carpus is angular, and armed with a regular series of twelve to eight- 
een small spines, while the outer edge is rounded and unarmed; and 
the prehensile edge of the dactylus is armed with two irregular and in- 
distinct teeth, corresponding with two irregular emarginations in the 
edge of the digital portion of the propodus. In the left cheliped the 
outer edge of the upper surface of the carpus is slightly rounded and 
scarcely at all spinulous, while the inner edge is armed as in the right 
cheliped. The left chela differs from that of H. socialis in having the 
digital portion of the propodus considerably stouter than the dactylus, 
particularly toward the base. 
The ambulatory legs are proportionally as long but more slender than 
in H. socialis ; in both pairs the dactylus is longer than the propodus, 
eurved slightly near the tip, about sixteen times as long as broad, sparsely 
ciliated along the upper edge, and very slightly setigerous along the 
lower. 5 
The female differs from the male as in H. socialis, but to a very much 
less extent, the chelipeds and ambulatory legs being only a little shorter 
than in the male, and the right cheliped only a little less stout and a 
little more like the left than in the male. 
The eggs are few and nearly as large as in H. socialis. 
Measurements. 
NN (k LEAS 
| (Sta. 874). (Sta. 874). 
mm mim. 
Length from front of carapax to tip of abdomen --.------------------------------ 12.0 | 11.2 
Length of earapax along median line .----- .---------------------+-+--+----+---> 3.4 3. 2 
Length of carapax from front to cervical suture..--.-------------------- Eobae eer | 2.2 2.1 
Breadth of carapax in tront ..----.-----.----- --- 22+ 2-222 ee eee eee ee eee ee eee 2.8 2.4 
Mength of eye-stalks ....-.--------------200-e-- 2-2 eee nnn ce een een eee | 1.6 a5 
Greatest diameter of eye..--------------------------2--2------ee essen en eee ane | 1.1 | 0.9 
Length of peduncle of antennula. -.----------------------------+------------0--7-> | 3.4 3.2 
Length of ultimate segment of the same. .----.----.------------ +--+ -+++ 05 --22-- | 1.6 | 1.5 
Length of peduncle of antenna beyond front a ened Pe ee sot aes OES 19 
Length of ultimate segment of peduncle of antenna..----.------------------ ---- 1 0 0.8 
Length of right cheliped...---.----------------- eset see eae cenac eee 15. 2 11.2 
Menehh of carpus ).--- .---2<-- 2 -< s00- eos en wcece seme enene sere en eens enn ee sa ene 4.0 2.8 
Menethioh propodus.. .. 2-2. ---- 2.22 --naa---00 2+ on - aeea wine sarees nner cote ana 6. 0 4. 4 
Breadth of propodus-----------------------+-----22- 22 -n nen sooner erence 2.4 1.8 
Menethi ofidactylus: --..-..--.-----2--2- = -eeen oe enna nn enn ane wee nse nec sneer ensee: 2.0 17 
Teneth of left cheliped -...-----------.------es0-2 --een2 nee eee cee eer cern n renee | 13. 6 10 0 
Mean ccitwytacan ni spees eee als eo eke 8 sso oo ows aS acing se obese sam pean ie 3. ome = 6 
MenaiiwoOepEBpPOUUS.. 025-22 dscecccs c= = de - 22 we eee se ne ce one nee neem so 510m} 3.6 
Breadth of propodas.-..--.----.------ Bees Oe ee sree og ene ade crore aaa 1. 1 | a0 
Menmitotedactylis: 50.620 ss2..c20- 5 see eee ees aeons ern rian wali ane ne 2.5 a 
Length of first ambulatory leg, right side......-.---------------------+----2----+- | 16.1 | 12. 8 
Length of propodus -- 4.0 | och 
Length of dactylus : 5.0 | aa 
Length of second ambulatory leg, right side 17. . | a 0 
Length of propodus Fi Y a : 
‘Weneth of dactylos )-.22.2.22..----------- 01-2 ee o-sene eon ne weenie Laide aber | 
