FEOM THE INDO-PACIFIC AND WEST AFRICA. 299 



margin of the rostrum was armed with 10, 9, rarely 8 teeth, which reached to the tip, and 

 Nobili describes also 8 or 9 teeth for specimens from the IMentawei Islands ; in seven 

 individuals from Celebes, recently described by Sclienkel, three were armed with 9, the 

 four others with 7, 8, 11, and 12 teeth. Tlie type specimen from the island of Samar 

 finally had a rostrum armed with 6 teeth on tlie upper margin. We may consequently 

 conclude that the number of these teeth is subject to much variation, and there are 

 perhaps local varieties in whicli it is constantly larger. The male specimen from North 

 Halmahera, 71i mm. long, that I have described in the third of the papers quoted 

 (p. 782), is lying before me. The meropodites of the fifth pair are 9 mm. long and 

 1-33 mm. broad on their oriter side ; the carpopodites are 5 mm. long and 12 mm. thick at 

 the distal end ; the propodites are 10 mm. long and 0'85 mm. broad in the middle ; the 

 dactylopodites finally are 2'75 mm. long. The three posterior legs are thus comparatively 

 a Utile less stout in proportion to their length than those of the adult specimens from 

 Dinawa. 



PaJcBinon (3Iac7'obmcMum) latimaniis has hitherto been recorded from the following 

 localities :— Mentawei Islands {Nobili) ; Flores {de 31.) ; Rotti {de 31.) ; Timor (de 31.) ; 

 Amboina (de 31.) ; Halmahera [de 31.) ; Celebes {de 31., Schenkel) ; Samar {von Martens) ; 

 Fiji Islands {Ortmaun). Fresh water. 



B.— SPECIES FROM WEST AFRICA. 

 Pal^mon (Eupal^mon) MACROBRACHiON, Hcrklots. (Plates 18. and 19. figs. 13-29.) 



Palemon macrobrachion, HerklotSj Additamenta ad Faunam Carciaologicam Africa Occidentalis, L. B., 



1851, p. 15. 

 Palcemon macrobrachion, de Man, in Notes from the Leydeu Museum, i. 1879, p. 177. 

 Confer : Carl W. S. Aurivillius, ' Krustaceen aus dem Kamerun-Gebiete,' in Bihang till K. Svenska Vet.- 



Akad. Haudlingar, Bd. xsiv. Afd. iv. No. 1, 1898, p. 19. 



The following collection is lying before me : — 



One male of medium size, obtained by Messrs. Biittikofer and Sala in 1881 in Liberia. 

 (Leyden Museum.) 



One adult male and one somewhat younger female without eggs, from the River Prah, 

 South of Ashantee, West Africa. (British Museum, Natural History.) 



Nine specimens of medium size (1 6 , 8 S ) from the Congo Coast, probably from 

 Ambriz. 



About 300 young and very young specimens, half of which have unfortunately lost 

 their legs of the second pair, from fresh water at Catumbella, near Benguella ; presented 

 to me, together with the Congo specimens, by my cousin, Mr. P. Kamermaa. 



Dr. Aurivillius, who has also studied a large number of specimens of this species 

 collected in Cameroon, was led to the conclusion that P. macrobrachion ought to 

 be identified with P. acanthurus, Wiegm. ; and be is followed in this opinion by 

 Miss Rathbun in Proc. U.S. National Museum, xxii. 1900, p. 315. The ideittittj of 

 both species apjiears very probable also to me: nevertheless I prefer to describe the 



SECOND SEKTES. — ZOOLOGY, VOL. IX. 13 



