REPORT ON THE BRACHYURA. 
173 
Neptunus ( Neptunus ) pelcigicus (Linne). 
Cancer pelagicus, Linne, Mus. Lud. Ulrici, p. 434, 1764; Syst. Nat., ed. 12, p. 1042, 
1766. 
Lupa pelagica, Audouin, in Savigny, Descr. de l’Egypte, Crust. Atlas, pi. iii. fig. 1. 
Neptunus pelagicus (partim), A. Milne Edwards, Arcliiv. Mus. Hist. Nat., vol. x. p. 320, 
1861. 
,, „ Miers, Ann. and Mag. Nat. Hist., ser. 4, vol. xvii. p. 221, 1876. 
Philippine Islands near Masbate (Station 203), lat. 11° 6' 0" N., long. 123° 9' 0" E., 
in 20 fathoms (an adult male.) 
Adult c? • 
Lines. 
Millims 
Length of carapace, .... 
28 
59-5 
Breadth to base of lateral epibranchial spine, 
491 
105 
Neptunus ( Neptunus ) sayi, A. Milne Edwards. 
Lupa pelarjica, Say, Journ. Acad. Nat. Sci. Philad., vol i. p. 97, 1817, nec Linne. 
Neptunus sayi , A. Milne Edwards, Archiv. Mus. Hist. Nat., vol. x. p. 317, pi. xxix. fig. 2, 
1861, and references to literature; Crust, in Miss. Sci. au Mexique, pt. 5, p. 210, 
1878. 
A large series of specimens of this common pelagic species was taken from the gulf- 
weed in the Western North Atlantic, in April 1873 ; an adult female in the North 
Atlantic, May 1876 ; also an adult male south of Nova Scotia, in lat. 43° 3' 0" N., long. 
63° 39' 0" W., at Station 49, where the depth was 85 fathoms. 
The convex, marbled carapace, short lateral epibranchial spine, and the absence of a 
spine on the posterior margin of the merus of the chelipedes are characteristic of this 
species. 
In the smallest examples in the Challenger series (length of carapace 4^ lines, 
9\5 mm., breadth to base of lateral epibranchial spines about 7 lines, 14'5 mm.), the 
full number of lateral marginal spines is developed, the posterior or epibranchial spine 
being relatively no larger than in the adult ; the frontal teeth are somewhat less prominent 
and distinct. 
The smallest ova-bearing female has the following dimensions: — 
O i O 
?• 
Lines. 
Millims. 
Length of carapace, about ..... 
7 
15 
Breadth to base of epibranchial spine, nearly 
11 
23 
The largest male has the following dimensions: — 
Adult 
Lines. 
Millims. 
Length of carapace, about ..... 
15* 
33 
Breadth to base of lateral epibranchial spine, about . 
251 
54-5 
