100 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
MerASUREMENTS.—Males, 8-35 mm.; females, 14-35 mm.; ovig. 
females, 19-24 mm.; Sacculina infected female, 26 mm.; juvs., 6-9 
mm. 
Remarks.—Examination of numerous fresh specimens from More- 
ton Bay, Queensland, together with those in the present collection, 
has revealed some divergence from the description by Stephenson 
and Hudson (1957). 
The first concerns the mesobranchial regions of the carapace, 
which sometimes bear a short, inconspicuous, but distinct ridge. 
It is not recognizable, presumably due to wear, in smoother hairless 
specimens and not always so in unworn specimens. When present 
it upsets the key (Stephenson and Hudson, 1957, p. 316, couplet 
12), but this is not serious since the species is clearly distinguishable 
from T. wakensis and T. picta which lie on the alternative branch. 
The second divergences concern male abdomens and first pleopods. 
In the present collection there are two groups of males, designated 
forms A and B respectively. Only the former was described and 
figured by Stephenson and Hudson. 
Form A (figs. 36 d, f, g) comprises: 
Malay Peninsula: Koh Pipedon, Pocket Bay, Benjal, Siam, 
Mar. 10, 1925, H. M. Smith, 1 male. 
China: AT-51, Namru-2-Taipei, 12 mi. S. of Tau Hsui, sea- 
shore, Lighthouse Beach, 1957, R. E. Kuntz, 1 male. 
Philippines: Reef opposite Cebu, Apr. 7, 1908, Alb., 1 male; 
Ulugan Bay near mouth of Bahili River, seine, Dec. 28, 1908, Alb., 
1 male. 
The outer surface of the pleopod bears many subterminal bristles 
and from none to five short conical spines, while the inner surface 
carries few sparsely arranged hairs. The sides of the penultimate 
segment of the male abdomen are almost straight. 
Form B (figs. 36 a—-c, e) comprises: 
Philippines: Sta. 5144, Jolo Lighthouse, 6°05’50”N., 121°02’15"E., 
19 fm., coarse sand, Feb. 15, 1908, Ald., 1 male; Sta. 5147, Sulade 
I. 5°41/40’N., 120°47/10”E., 21 fm., coarse sand, shells, Feb. 
16, 1908, Alb., 1 male; Sta. 5159, Tinakta I., Sulu Archipelago, 
Tawitawi Group, 5°12’N., 119°54’30”E., 12 fm., Feb. 21, 1908, 
Alb., 1 male; Sta. 5164, Observation I., Sulu Archipelago, Tawitawi 
Group, 18 fm., green mud, Feb. 24, 1908, Alb., 1 male. 
In form B the outer surface of the pleopod bears numerous sub- 
terminal robust spines, while the inner surface carries numerous 
spines or stout bristles, generally continuing some distance proximally. 
The sides of the penultimate segment of the male abdomen are 
markedly convex. 
Young males of form B differ from the adults in that only few 
