14 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 125 
transverse dark band, anterior margin and submedian portion of 
posterior margin lighter; uropodal exopod with dark spot at articu- 
lation of distal segment, apex of distal segment lighter; uropodal 
endopod dark. 
Discussion.—Lysiosquilla tredecimdentata is very similar in gen- 
eral appearance to L. maculata (Fabricius), a common Indo-West 
Pacific species, but Holthuis’s species differs in several important 
respects as follows: (1) the ocular scales are broad and truncate 
dorsally; (2) the anterior margin of the antennal peduncle is pro- 
duced into an acute projection (fig. 4a) whereas it is straight in L. 
maculata; (3) the antennal scale is slender and outlined in dark 
color rather than oval with a dark patch on the surface; (4) there 
are more teeth on the claw, 11-13 rather than 9-11; and (5) the 
ventral keel of the eighth thoracic somite is produced into a posterior 
spine and is not evenly rounded. 
The petasma of the smaller male is shown in figure 4c. The hook 
process is extremely reduced; the tube process is slender, and 
retinaculae are confined to the distal half. 
Manning (1968b) gave a detailed account of this species from 
Madagascar and suggested that the accounts of Chopra (1939) and 
Ingle (1963) based on a specimen from Aden identified as LZ. maculata 
might be referable to L. tredecimdentata. Since that manuscript was 
completed, one of us (R. B. M.) has had an opportunity of examining 
these authors’ material at the British Museum. The single specimen 
from Aden, a female, TL 156 mm, clearly belongs to L. tredecim- 
dentata. 
The larger of the two specimens reported herein is probably the 
specimen on which Baig’s record of ZL. maculata from Karachi was 
based. 
DistTRIBUTION.—Western Indian Ocean, from Aden, West Pakistan, 
and Madagascar. 
Family GoNODACTYLIDAE Giesbrecht, 1910 
Diaenosis.—Propodi of third, fourth, and fifth thoracic append- 
ages longer than broad, not beaded or ribbed ventrally (fig. 9b); 
telson with sharp median dorsal carina and no more than 2 inter- 
mediate denticles on margin. 
Remarxks.—Three of the genera assigned to this family by Manning 
(1968a) occur off West Pakistan; they may be distinguished by use of 
the key given below. 
Four species in other genera, reported from the Red Sea by Ingle 
(1963), could also be expected to occur off West Pakistan. These are: 
(1) Pseudosquilla ciliata (Fabricius), which has a wide distribution 
