286 DR. J. G. DE MAN ON THE PODOPHTHALMOUS 
length; whereas the remaining part, like the other flagellum, is 
cylindrical. This structure, as we know, is more completely 
developed in the genus Solenocera, in which the whole upper 
flagellum is broader than the other, and bollow on its inner 
side. 
Peneus semisulcatus, de Haan, has been recorded from the Red 
Sea (Djeddah, de AZan), Mozambique (Hilgendorf’), Pondicherry, 
Calcutta, the Chinese and Japanese Seas, the Philippines, the 
Fiji Islands, and from North Australia. It appears, therefore, 
to be an inhabitant of the whole Indo-Pacific region. 
159. Penzus scucpritts, Heller. 
Peneus sculptilis, Heller, Crustaceen der Novara- Reise, p. 122, Taf. x1. 
hes ie 
Two fine adult female specimens were collected in the Mergui 
Archipelago. The larger specimen measures 140 millim. from 
the tip of the rostrum to the end of the terminal segment of the 
postabdomen, and therefore appears still larger than the speci- 
mens of the ‘ Novara’ Expedition. These individuals agree per- 
fectly with Heller’s description and figure, except in the length 
of the flagella of the upper antenne. In them the flagella of 
the internal antenne are alittle shorter than their peduncle; but 
Heller figured them as longer than it. Perhaps this difference 
of length may be a sexual character, and I therefore call attention 
to it. 
The surface of the cephalothorax appears minutely punctate 
when seen under a magnifying-glass. The upper margin of the 
rostrum, which extends as much forward as the antennal scales 
and is slightly convex above the eyes, and somewhat curved 
upward at its styliform acute extremity, is armed with eight 
teeth in the specimens, and in the ‘ Novara’ specimens with nine; 
but this difference is certainly individual. The posterior tooth is 
placed immediately before the hepatic spine, when both are com- 
pared with one another, and is separated by more than twice 
the ordinary distance from the preceding. The dorsal median 
crest, which extends from the base of the rostrum to the posterior 
margin, is distinctly canaliculated. 
The dorsal median caring of the first and second segments 
are rather obtuse ; each consists of two small, parallel, longi- 
tudinal ridges, situated close to one another; the carine of the 
other segments gradually appear more acute. The telson is 
