288 REV. T. R. R. STEBBING ON STALK-EYED CRUSTACEA MALACOSTRACA 



times as long, separated by two densely plumose setae, nearly as long as the spines 

 and emerging from below the median process. The length of the species is given by 

 Bate as 24 mm. for the male and 33 mm. for the female ; by Miss Rathbun as 

 35 "5 mm. for an ovigerous female; by Dana as two inches for his New Zealand 

 specimen ; and though some of the South African specimens do not attain to this size, 

 others exceed it, reaching 2f inches. 



Locality. — Saldanha Bay, May 19, 1904, 8-10 fathoms; Reitz Bay, May 20, 1904, 

 5 fathoms ; Station 482. 



Leander tenuicornis (Say). 



1818. Palxmon tenuicornis, Say, J. Ac. Sci. Philad., vol. i. part ii. p. 249. 



1837. Palemon natator, Milne-Edwards, Hist. Nat. Crust., vol. ii. p. 393 (P. tenuirostre, p. 395). 



1849. Leander erraticus, Desmarest, Ann. Soc. Entom. France, ser. 2, vol. vii. p. 92, text-fig. on p. 93. 



1860. Leander natator, Stimpson, Pr. Ac. Sci. Philad., vol. xii. p. 40 (109). 



1879. Leander tenuicornis, S. I. Smith, Tr. Connect. Aci., vol. v. p. 122. 



1884. Palxmon tenuirostris, Cams, Prodr. Faunx Mediterranex, part ii. p. 474. 



1888. Leander natator, de Man, Arch. Naturg., vol. liii. p. 563. 



1888. Palxmon natator, Bate, Rep. Voy. " Challenger," vol. xxiv. p. 784, pi. cxxviii. figs. 6, 7. 



1890. Leander natator, Ortmann, Zool. Jahrb., vol. v. p. 525. 



1893. Leander tenuicornis, Ortmann, Ergebn. Plankton- Exp., vol. ii., G. b., p. 48. 



1908. „ „ Verrill, Tr. Connect. Aci. Sci., vol. xiii. pp. 326, 377. 



Verrill mentions this species along with Latreutes fucorum and the crabs Lupa 



sayi, Gibbes, and Planes minutus (Linn.), as constant tenants of the Gulf weed. 



Ortmann agrees with de Man in regarding de Haan's Palaemon latirostris as a 



synonym of this species, although de Haan, like Desmarest, describes the lower 



margin of the rostrum as without teeth, while Say gives the rostrum eleven or 



twelve teeth above and six or seven below. A dissected specimen shows twelve 



above and six below ; the teeth in this species are much beset with setae, especially 



on the lower margin. Of the lateral spines of the carapace the lower one stands 



back from the margin, instead of adjoining it as in L. squilla and L. affinis. The 



eyes in several specimens retain traces of two parallel colour bands across the 



ophthalmic area. The first antennae have the shortest flagellum united with its 



partner for a very short space. The mandibles have a very slender two-jointed palp, 



the second joint much the longer. The first maxillae differ very slightly from those 



of the other two species, except that the apical series of spines on the inner plate is 



not continued on to the lateral margin. In the second maxillipeds the terminal 



joint is produced well beyond the penultimate, with no continuity of curve between 



them. In the dissected specimen the first peraeopods have the fourth joint longer 



than the fifth, which is slightly shorter than the sixth ; the fingers of the chela are 



considerably longer than the palm. In the second peraeopods also the fourth joint is 



a little longer than the fifth, which is decidedly shorter than the sixth, but here the 



fingers are only a little longer than the somewhat inflated palm. The telson ends apic- 



ally much as in the other species, except that the long spines are at least five times 



as long as those at the angles, and, though separated by the median process, beyond it 



