42 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxi. 



Size. — Sars had 5 specimens, the largest being- a male, 59 mm. 

 long. My material from the Hawaiian Islands consisted of 40 speci- 

 mens, the largest of which was a female, 62 .mm. long, with the 

 marsupial pouch fully developed. Since there were other females, in 

 which at about the size of 50 mm. the marsupial lamellse were well 

 formed, it is probable that this species does not attain the gigantic 

 dimensions seen in others. 



Distribution. — Off Samboangan, Philippines, 250 fathoms (Sars). 

 Not rare at the Hawaiian Islands (found at 15 stations), near the islands 

 of Oahu, Molokai, and in Kaiwi Channel, 222-498 fathoms (Ortmann). 



9. GNATHOPHAUSIA ZOÈA Willemoes-Suhm. 



Plate II, fig. 2a, 2b. 



Gnathophausia zoea Willemoes-Suhm, Nature, VIII, 1873, p. 401, fig. 6; Trans. 



Linn. Soc. London (2), I, 1875, p. 32, pi. xix, figs. 2-15; pi. x, fig. 4. — A. 



Milne-Edwards, Rec. fig. Crust, nouv., I, 1883. — G. 0. Sars, Rep. Chall., 



XIII, 1885, p. 44, pi. vi, figs. 6-10.— Faxon, Mem. Mus. Comp. Zool, XVIII, 



1895, p. 215. — Caullery, Ann. Univ. Lyon, fasc. 2, 1896, p. 368. — Alcock and 



Anderson, Ann. Nat. Hist. (7), III, 1899, p. 3. — Holt and Tattersall, Rep. 



Fisheries Ireland, II, App. 4, 1905, p. 141. — Hansen, Bull. Mus. Monaco, 



XXX, 1905, p. 5. 

 Gnathophausia willemoesi G. 0. Sars, Forh. Selsk. Christiania, 1883, no. 6; Rep. 



Challenger, XIII, 1885, p. 38, pi. v, figs. 1-6. — Faxon, Mem. Mus. Comp. 



Zool., XVIII, 1895, p. 215, pi. k, fig. 1.— Ortmann, Bull. U. S. Fish. Comm. 



for 1903, Pt. 3, 1905, p. 969. 



io. GNATHOPHAUSIA ZOÈA SARSI (Wood- Mason) . 



Gnathophausia sarsi Wood-Mason, Ann. Nat. Hist. (6), VII, 1891, p. 187. — Ort- 

 mann, Bull. U. S. Fish. Comm. for 1903, Pt. 3, 1905, p. 969. 



The following are the characters of the species: 



Carapace with keels and spines of the t}<pe of the second group: 

 upper lateral keel present; lower lateral keel curved up behind; dorsal 

 keel continuous. Rostrum, according to age, longer or shorter. Dorsal 

 spine long in the young; shorter in the old. Supraocular and anten- 

 nal spines well developed; branchiostegal spine absent, and branchio- 

 stegal lobe rounded. No postero-inferior spines, but postero-inferior 

 angle of carapace rounded off or (in the variety) rectangular, forming 

 a narrow laminar expansion behind the marginal rim, which also 

 curves upward. The carapace is not suddenly constricted in the 

 anterior part. 



Antennal scale of the type of the second group: large, spine of outer 

 margin projecting slightly beyond the terminal lobe of lamellar part 

 in the young, slightly shorter than the latter in the old. Outer mar- 

 gin of spine slightly serrated in the young, smooth in the old. 



Abdomen of the type of the second group: the five anterior seg- 

 ments dorsal l} r indistinctly keeled, and produced into small spines at 



