242 
none has spines on the sixth abdominal seg¬ 
ment, nor is the protuberance present on the 
telson. Thus, it is impossible to determine 
definitely whether they belong to L. orien¬ 
tals Hansen or to L. typus. Since they were 
taken in the same tow with the male speci¬ 
men identified as typus, it is probable that 
they are conspecific. The distribution of 
typus in the Pacific and Indian Oceans is 
confused since orientalis and typus, both 
long eyestalked species, were not separated 
until 1919 (Hansen, op. cit.). Thus, all 
records of long eyestalked species in these 
ocean areas prior to 1919 must be discarded 
as without specific value. L. typus is very 
abundant in the Atlantic from latitude 34° 
N. to latitude 40° S., and has been found in 
the Pacific and Indian Oceans near the 
Philippines, the South China Sea, the Bay 
of Bengal, and the Netherlands Indies, as 
well as at Wake Island and the Hawaiian 
Islands. This species, so far as is known, is 
not found inshore or in brackish water. 
The known Hawaiian species may be sep¬ 
arated by the following key: 
A. Distance between the labrum and the in¬ 
sertion of the eyestalks somewhat or only 
a little longer than the eyestalks with 
eyes (the basal short joint of the stalks 
PACIFIC SCIENCE, Vol. 1, October, 1947 
included). In the male, the terminal 
portion of the petasma moderately 
thick, and the processus ventralis shaped 
as a somewhat broad plate....... 
-.-. L. typus H. M.-Edw. 
B. Distance between the labrum and the in¬ 
sertion of the eyestalks more than twice 
as long as the eyestalks with eyes. In the 
male, the terminal portion of the petasma 
tapers gradually from the base to the 
acute end, and the processus ventralis is 
needle-like, tapering to the very acute 
end... L. jaxonii Borrad. 
REFERENCES 
Bate, C. Spence. Report on the Crustacea Ma- 
crura collected by H. M. S. "Challenger” during 
the years 1873-76. Challenger Rpt, Zool., vol. 
24. xc + 942 p., 150 pi., 76 fig. London, 1888. 
Edmondson, C. H. Crustacea from Palmyra and 
Fanning Islands. Bernice P. Bishop Mus. Bui. 
5. 43 p., 2 pi., 3 fig. Honolulu, 1923. 
-, W. K. Fisher, H. L. Clark, A. L. Tread¬ 
well, and J. A. Cushman. Marine zoology of 
tropical Central Pacific. Bernice P. Bishop Mus. 
Bui. 27. ii + 148 p., 11 pi., 11 fig. Honolulu, 
1925. 
Hansen, H. J. The Sergestidae of the "Siboga” 
Expedition. Uitkomsten op Zoologisch, Bota- 
nisch, Oceanographisch en Geologisch Gebied, 
Monog. 38. 65 p., 5 pi., 14 fig. Leiden, 1919. 
