121 
to the one immediately preceding it is about tlie same as in 
that species. There are six tubercles of varying sizes on each 
branchial region — -apart from the lateral spines — and the two 
cardiac tubercles are distinct. The cardiac and intestinal re- 
gions are marked off by sinuous rows of pits, which assume 
irregular groups on the sides of the intestinal region. 
The eyes are rather small. 
The sub-hepatic region has the anvil-shaped spine before 
mentioned. 
The external distal spine of the basal antennal joint is 
large, the internal one very small. There is an oblique sulca- 
tion on this joint, as in the preceding species. 
This species is common in shallow water at Port Wil- 
lunga, Edithburg, and elsewhere, and Mr. Fulton has sent 
me specimens from Western Port, Victoria. 
Length of carapace, 44 mm. 
Breadth of carapace, 32 mm. 
Length of rostral horn, 9 mm. 
Inter-ocular space, 11 mm. 
Length of first ambulatory leg, 56 mm. 
Halimus tumidus, Dana. Plate xxii., figs. 3, 3a. 
(U.S. Exploring Exped. Crust., 1, p. 165.) 
My specimens of this species are small. 
The carapace is very convex, anteriorily depressed, as are 
much so the rostral horns, which also are somewhat verti- 
cally compressed. The tubercles of the upper surface are not 
strongly marked, but are more numerous than in the preced- 
ing species. The inter-ocular tubercles are very low. There 
is no spine on the posterior border, an intestinal tubercle is 
present, as also are two on the cardiac region, with a small 
one tending to become double between them. The anterior 
portion of the upper orbital margin is merely thickened, 
rounded anteriorly, and posteriorly scarcely acute. The in- 
termediate spine is nearly horizontal in position, and is near 
to the post-ocular. The post-ocular spine is well developed, 
but the remaining lateral spines poorly, especially the last. 
The basal joint of the antenna has its external distal 
spine very large and somewhat compressed, showing well 
from above, spinulose on its outer margin, and strongly 
pressed upwards. The internal distal spine is very small, 
the oblique sulcation wide and shallow, the remaining pedun- 
cular joints are almost totally hidden by the rostral horn. ^ 
The pleon of the male has the segments scarcely promi- 
nent medianly except the first two. The pleon of the female 
ends in a distinct though obtuse point. 
