40 “ Bulletin American Museum of Natural History [Vol. LIII 
Macrobrachium olfersii (Wiegmann) 
Palzmon olfersii W1EGMANN, 1836, Archiv f. Naturg., IT, pt. 1, p. 150. 
Bithynis olfersii Ravasun, 1900, Proc. U. 8. Nat. Mus., XXII, p. 316. 
Palemon (Macrobrachium) olfersii pk Man, 1904, Trans. Linn. Soc. London, 
(2) Zool., IX, p. 314, Pl. xx, figs. 54-74, and synonymy; 1912, Ann. Soc. Roy. Zool. 
Malacol. Belgique, XLVI (1911), p. 109. 
Macrobrachium olfersii Ratupun, 1910, Proc. U. S. Nat. Mus., XX XVIII, p. 
604. 
African, according to de Man (1912): Islands of Annobon, Rolas, Saint Thomas, 
Princess, Fernando Po (Greef, Osorio, Bouvier); River Prah, Ashantee (de Man), 
Bibundi and Etome, Cameroon (Aurivillius), Catumbella River, Angola (de Man). 
American, from Rathbun (1910): La Paz, Mexico, to Rio Sabana, Darien; West 
Indies to Rio de Janeiro. 
Malela, July 8, 1915, 1 young. 
Pontoniine 
Pontonia Latreille - 
Pontonia LATREILLE, 1829, In Cuvier’s ‘Régne Animal,’ 2d Ed., IV, p. 96. 
Pontonia tyrrhena (Petagna) 
Text Figure 66 
Astacus tyrrhenus PreTAGNA, 1792, ‘Inst. Entom.,’ p. 418, Pl. v, fig. 3 (I have not 
seen this work). 
Pontonia custos Gum®RIN, 1882, ‘Exped. Morée,’ III, Zool., sect. 2, p. 36, PI. 
XXvil, figs. 1, la-m (except j). Prstra, 1918, ‘Decapodenfauna der Adria,’ p. 128, 
fig. 43 (part). 
Pontonia tyrrhena BORRADAILE, 1917, Trans. Linn. Soc. London, (2) Zool., XVII, 
p. 390, Pl. tvn, fig. 29, and synonymy. Kemp, 1922, Rec. Indian Mus., XXIV, pt. 
2, p. 200; 
Heretofore this species was not definitely known to occur in other than Medi- 
terranean waters. The present record represents a considerable extension of its 
range. 
St. Paul de Loanda, September 22, 1915; between bunches of asci- 
dians and sponges, 19 ovig.; 207,29; September 24, 1915, 1%, 19 
(ovig.). 
M®ASUREMENTS.—The figured ovigerous female is about 37.5 mm. 
long over all, carapace alone 12, and rostrum 3.8 mm. 
Having comparative material from Naples at hand, it is possible to 
identify with certainty these specimens taken at St. Paul de Loanda with 
the well-known Mediterranean form, Pontonia tyrrhena. 
Since the mouth-parts are playing an increasingly important part 
in the proper diagnosis of pontoniids, these appendages of one of our 
specimens have been drawn (text figs. 66d-2). This specimen, of which 
