NO. 3666 CRUSTACEA—TIRMIZI AND MANNING Al 
Not all fresh specimens exhibit dark patches on the second and fifth 
abdominal somites, but these are well marked in a few specimens. 
Discusston.—The relatively small eyes, long anterior bifurcation 
on the median carina of the carapace, and large, truncate anterior 
lobe on the lateral process of the sixth thoracic somite will immediately 
distinguish O. nepa from the other two species of the genus found in 
the waters off West Pakistan, 0. interrupta and O. hesperia. Orato- 
squilla nepa is the least abundant of the three species, but it still occurs 
in relatively large numbers. 
Several of the specimens show unusual variation in the configura- 
tion of the anterior bifurcation of the median carina of the carapace; 
these variations are shown in figures 15e—-h. The typical shape of the 
bifurcation is shown in figure 15¢; in some specimens the arms of the 
bifurcation converge anteriorly, beyond the dorsal pit, but do not 
meet. In one specimen the bifurcation is closed by a short bar (fig. 
15f). Finally, in each of a series of three specimens the bifurcation 
closes anterior to the dorsal pit, continues anteriorly for a short 
distance as a single ridge, and reopens again (fig. 154). There does 
not seem to be any correlation of these variations with sex or size, 
and the specimens are typical of the species in all other respects. 
Some specimens exhibit a uniform dusky-gray color pattern, 
whereas others show distinct rectangular patches on the second and 
fifth abdominal somites, suggesting a possible dimorphism in color. 
Kemp (1913) noted similar variation in other collections. 
In one of the specimens the posterior margin of the carapace is 
deformed, and the median posterior projection is bifurcate (fig. 157). 
DistTRIBUTION.—Widely distributed in the Indo-West Pacific re- 
gion, from West Pakistan and Mogambique to Hong Kong and Aus- 
tralia. It recorded from Karachi by Kemp (19138). 
16. Oratosquilla interrupta (Kemp, 1911) 
Fiaure 16 
Squilla interrupta—Kemp, 1913, p. 72, pl. 5 (figs. 60-62).—Chopra, 1934, p. 25.— 
Holthuis, 1941, p. 253 [older references].—Baig, 1954, p. 143.—Manning, 
1966, p. 97, fig. 4.—Chhapgar and Sane, 1968, p. 45 [key]. 
MaTEerRIAL.—1@, 71 mm; off Karachi; Central Fisheries Department.—10<, 
88-113 mm; 59, 938-123 mm (in 7 lots); off Karachi; University of Karachi.— 
ldry ?, CL 17.2 mm; near Karachi; Mohammed Abdullah el Husseini; USNM.— 
1o¢, 128 mm; West Pakistan; A. H. Qadri; USNM.—1<, 100 mm; off Karachi; 
University of Karachi; USNM. 
Description.—Hye large, cornea bilobed, set obliquely on stalk; 
ocular scales subtruncate, inclined laterally; rostral plate subquadrate, 
without carinae, lateral margins upturned, apex truncate; anterior 
bifurcation of median carina of carapace with basal interruption, 
