286 DR. J. G. DE MAl«r ON THE PODOPHTHALMOTJS 



leagth ; whereas the remaining part, like the other flagellum, is 

 cylindrical. This structure, as we know, is more completely 

 deyeloped in the genus Solenocera, in which the whole upper 

 flagellum is broader than the otter, and hollow on its inner 

 side. 



Fenceus semisulcatus, de Haan, lias been recorded from the Eed 

 Sea (Djeddah, de Man), Mozambique {Hilgendorf), Pondicherry, 

 Calcutta, the Chinese and Japanese Seas, the Philippines, the 

 !Fiji Islands, and from Korth Australia. ' It appears, therefore, 

 to be an inhabitant of the whole Indo-Pacific region. 



159, Pen^tjs sctjlptilts. Seller. 



Penseus sculptilis, Heller, Crustaceen der Novara-Reise, p. 122, Taf. xi. 

 fig. 1. 



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 antennae. In them the flagella of 

 the internal antennae are a little shorter than their peduncle ; but 

 Heller figured them as longer than it. Perhaps this difference 

 of leugtbmay be a sexual cbaracter, 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, whicb 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 difierence 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 carinas of tbe first and second segments 

 are rather obtuse ; each consists of two small, parallel, longi- 

 tudinal ridges, situated close to one another ; the carinae of the 

 other segments gradually appear more acute. The telson is 



