Lucifer chacei n. sp. — B owman 
271 
external reproductive system in specimens 
cleared in lactic acid. The thelycum consists of 
a conical median ventral process between the 
bases of the third pereopods, behind which is 
a longitudinal slit leading into the atrium, a 
sclerotized pouch formed by a median depres- 
sion of the sternum. When present, the sper- 
matophore neck is inserted into the atrium 
through the slit. The large paired seminal re- 
ceptacles lie posterior and lateral to the atrium. 
In my cleared material it was evident that the 
seminal receptacles connect by ducts to the 
atrium, but the nature of the ducts was not 
clear. I could not detect the female genital 
openings, which Burkenroad (1934) and Gor- 
don (1956) found on the coxae of the third 
pereopods. The entire system is rather complex 
and, as Gordon pointed out, is in need of 
critical study using histological techniques. 
Several females from Bora Bora had clusters 
of eggs attached by short stalks to the ischia of 
the third pereopods. The eggs were probably 
about ready to hatch, for well-developed nauplii 
could be seen through the egg membranes. Be- 
cause of the ease with which eggs become de- 
tached from the third pereopods in preserved 
specimens, Gordon (1956) doubts that they 
stay attached until the nauplii emerge, a period 
of more than 36 hours according to Brooks 
(1882). The Bora Bora specimens prove that 
at least some of the eggs remain attached until 
eclosion. 
REFERENCES 
Brooks, W. K. 1882. Lucifer , a study in mor- 
phology. Phil. Trans. Roy. Soc. London 173: 
57-137, pis. 1-11. 
Burkenroad, Martin D. 1934. The Penae- 
idea of Louisiana with a discussion of their 
world relationships. Bull. Am. Mus. Nat. 
Hist. 68 (art. 2) :6l-l43. 
Chace, Fenner A., Jr. 1955. Notes on 
shrimps from the Marshall Islands. Proc. 
U. S. Natl. Mus. 105(3349) :l-22. 
Edmondson, Charles H. 1923. Crustacea 
from Palmrya and Fanning Islands. B. P. 
Bishop Mus. Bull. 5:1-43, pis. 1-2. 
1925. Crustacea, pp. 3-62. In: C. H. 
Edmondson, W. K. Fisher, H. L. Clark, 
A. L. Treadwell, and J. A. Cushman, Marine 
Zoology of Tropical Central Pacific. B. P. 
Bishop Mus. Bull. 27 :i — ii, 3-148, pis. 1—11. 
Gordon, Isabella. 1956. The Sergestidae of 
the Great Barrier Reef Expedition. Great 
Barrier Reef Exped. Sci. Rept. 6(5) :323- 
333. 
Hansen, H. J. 1919. The Sergestidae of the 
Siboga Expedition. Siboga-Expeditie, Mono- 
graph 38, 65 pp., 5 pis. 
Hiatt, Robert W. 1947. Ghost prawns (sub- 
family Luciferinae) in Hawaii. Pacif. Sci. 1 
(4) :24l-242. 
Holthuis, Lipke K. 1959. The Crustacea 
Decapoda of Suriname (Dutch Guiana). 
Zook Verh., Leiden, no. 44, 296 pp., 16 pis. 
