52 
PACIFIC SCIENCE, Vol. VII, January, 1953 
TYPE SPECIMEN: A 16 mm. ovigerous fe- 
male, "Albatross” Station 4128, off Kauai, 
68-90 fathoms, U. S. N. M. 91602. 
DESCRIPTION: Rostrum well developed, 
reaching almost to end of first antennular ar- 
ticle and almost twice as long as broad at 
base; top rounded, not carinate. Orbital hoods 
somewhat inflated, with acute orbital teeth 
reaching beyond middle of rostrum. Orbito- 
rostral furrows slight, rounded. 
Visible portion of first antennular article 
more than 0.7 length of second article; second 
article twice length of third article, and 3 
times as long as broad at base. Stylocerite 
reaching to end of first article. Lateral spine 
of basicerite nearly reaching to level of tip of 
rostrum. Squamous portion of scaphocerite 
narrow and almost 0.9 as long as lateral spine; 
tip of lateral spine reaching to end of anten- 
nular peduncle. Carpocerite reaching slightly 
past middle of third antennular article. 
Large chela slightly over 3 times as long as 
broad, strongly compressed, with pronounced 
crests and grooves. [For terminology of crests 
and grooves, see Fig. 17^.] Superior crest 
strong, terminating distally as strong acute 
tooth above articulation of dactylus. Trans- 
verse groove deep, proximally overhanging, 
distally rounded. Superior groove only mod- 
erately deep. Plaque crest strong, with sharp 
ridge, proximally merging with superior mar- 
gin of palm. Palmar groove well defined. In- 
ferior crest with lower margin better defined 
than upper; ending at dactylar articulation as 
tooth smaller than that of superior crest. In- 
ferior depression shallow but distinct, shoul- 
der rounded. Dactylus with high crest, over 
0.2 length of entire chela, thin, flat on outer 
face, rounded inner face with several distinct 
rounded lobes distally, extending over fixed 
finger. Carpus of usual form. Merus 3 times 
as long as breadth of outer surface and twice 
as long as maximum breadth, superior and in- 
ferior external margins rounded; inferior in- 
ternal margin with strong, acute tooth and 
3 small spinules; superior margin rounded 
distally. Ischium with single spine. 
Total length of small cheliped 0.7 length 
of large cheliped, chela about 0.6 length of 
larger. Chela almost 5 times as long as broad 
with fingers 0.4 length of entire chela. Palm 
ovoid, articulation of ' dactylus with strong 
teeth on each side. Dactylus narrow, crested. 
Carpus rather small. Merus 0.7 as long as 
chela, 1.3 times as long as corresponding ar- 
ticle on large chela; slender, about 5.5 times 
as long as broad; inferior internal margin 
armed with 4 small spines and small tooth 
distally. Ischium with single inferior spine. 
Carpal articles of secorrd leg with ratio 10 : 
5 : 3 : 5.5 : 4. 
Ischium of third legs about 0.5 as long as 
merus, with strong movable spine. Merus 6.5 
times as long as broad, unarmed. Carpus 0.6 
as long as merus, with acute tooth distally on 
superior margin. Propodus 0.9 as long as me- 
rus, with 10 strong spines along inferior and 
distal margin; last spine bent distally, with 
minute serrations on convex portion. Dac- 
tylus 0.23 as long as merus, only slightly ta- 
pering in proximal 0.7; basal portion de- 
marked from distal 0.25 by slight ridge pro- 
longed inferiorly as small projecting tooth; 
tip tapering, acute. 
DISCUSSION: This particular form is repre- 
sented in the collections studied by only two 
semi-intact specimens collected by the "Al- 
batross” in Hawaiian waters. There is a series 
of additional individuals, from the same and 
other stations, which are so fragmentary that 
positive identifications cannot be made. 
The other specimen sufficiently intact for 
positive identification, a male 19 mm. long, 
varies from the type in the following charac- 
teristics: rostrum reaches end of first anten- 
nular article; large chela 2.9 times as long as 
broad; merus of large chela 1.4 times as long 
as maximum breadth, with 5 spines, plus 2 
on ischium; small chela lacking; carpal arti- 
cle with ratio 10: 5:2. 5:6:4; articles of 
third leg with ratio 2.5 : 10 : 6 : 9 : 1.9; pro- 
podus with 14 spines; dactylus with short 
bristles on superior margin. These differences 
