92 
PACIFIC SCIENCE, Vol. VII, January, 1953 
setae and bristles. Carpus slightly longer than 
that of large cheliped and with rounded pro- 
jection on inner distal edge. Merus similar in 
form and proportions to that of large 
cheliped. 
Ischium of second legs almost as long as 
merus. Carpal articles together 1.2 times 
length of merus, with ratio 10 : 6 : 4 : 3 : 8. 
Fingers of chela as long as palm. Entire ap- 
pendage shorter than third legs. 
Third legs without spines on ischium. Me- 
rus tapering, inermous, 3 times as long as 
wide. Carpus 0.4 as long as merus, without 
spines but with both margins continued dis- 
tally to form rounded tooth. Propodus arcu- 
ate, 0.7 as long as merus, with 6 movable 
spines. Dactylus biunguiculate with inferior 
hook larger in diameter but slightly shorter in 
length than distal hook. Fourth legs similar 
but larger. Fifth legs with proximal 3 articles 
shorter and of slightly different proportions; 
propodus and dactylus equal to those of third 
legs; brush of propodus of but 2 rows of bris- 
tles; inferior tooth of dactylus feebly devel- 
oped. 
First pleopod of female reduced and with- 
out articulations in both rami; endopod lack- 
ing appendix interna; second and following 
pleopods with endopods bearing separate 
broad lobes for appendix interna. Second pleo- 
pods of male of peculiar form (see Fig. 31^). 
Telson 1.7 times as long as broad, tip about 
0.5 as broad as ba*se; margins shghtly convex; 
dorsal spinules at 0.4 and 0.7 of distance from 
anterior articulation. 
Branchial formula without mastigobranch 
on base of seventh thoracic appendage and 
setobranch on eighth; pleurobranch of third 
also lacking. 
Mature individuals of both sexes ranged 
from 6 to 10 mm. in length. Color in life not 
recorded. 
DISCUSSION: The 20 specimens of this spe- 
cies show little variation. One peculiar tend- 
ency, similar to that observed in C. paragra- 
cilis, is for the anterior portion of the body to 
Fig. 31. Crangon nanus sp. nov. a, Second pleopod of male; b, first pleopod of female; c, d, e, endopods of 
second to fourth pleopods of female;/, anterior region of specimen showing slight protrusion of eyes; g, h, anterior 
region of specimen showing extreme protrusion of eyes, {a-e, scale K\ f-h, scale B.) 
