96 Bulletin Vanderbilt Marine Museum, Vol. VI 



Peneus group, 1906, p. 12, pi. 1, fig. 3, 3a. — Lenz, H., in 

 Voetlzkow, Reise in Ost.-Afrika, 1903-05, Wiss. Ergebn. Zool. 

 II, 1910, p. 570.— Balss, H., Zool, Ergebn. Denksch. K. Ak. 

 Wiss. Wien, Bd. XCI, 1915, p. 13. 



Peneus merguiensis de Man 



Plates 24 



Type: The type series, consisting of five males and two fe- 

 males, was collected in the Mergui Archipelago and is deposited 

 in the Leyden Museum. 



Distribution: Mergui Archipelago, Java Sea, Makassar, 

 Celebes (de Man) ; Makassar (Rathbun) ; India: Karachi, Bom- 

 bay, Palk Straits, Orissa, Ganjam, Hooghly Delta (Alcock) ; 

 Philippine Islands (Bate) ; Atjatuning, west coast of New Guinea, 

 "Siboga," Station 169 (de Man) ; Noumea, New Caledonia 

 (Boone). 



Material examined: Five specimens, collected in Noumea, 

 New Caledonia, September 19, 1931. 



Technical description : The rostrum is about one millimeter 

 shorter than the peduncle of the antennulae; the rostral ca- 

 rina extends about three-fourths of the length of the carapace 

 (measured from the inner orbital angle to the posterior margin) ; 

 this carina is produced into a laminate, triangulate crest, being 

 elevated some distance posterior to the epigastric tooth, this ele- 

 vation increasing to the next tooth and thence decreasing to the 

 third, fourth and fifth teeth successively, at which point the crest 

 vanishes as does also the carina which defines this crest basally, 

 extending along the upper lateral margin of the rostrum, from 

 this fifth rostral tooth backwards to a point midway between the 

 epigastric and the first rostral tooth. The rostrum, beyond this 

 triangulate crest, extends forward and slightly downward, is 

 thick, compressed cylindrical, with a sharp point and has dorsally, 

 in addition to the cervical tooth and five teeth of the triangular 

 crest, a sixth, subdistal tooth, placed well back from the apex ; on 

 the ventral surface of the rostrum there are five teeth, the proxi- 

 mal one of which is just above the tip of the eyestalk, approxi- 

 mately opposite the fifth dorsal rostral tooth; the second, third 

 and fourth ventral teeth are subequally spaced, the fourth tooth 

 being slightly in advance of the sixth dorsal tooth, while the fifth 



