262 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
Allotype male.—U.S.N.M. No. 70442; station 5553, latitude 5°51’ N., 
longitude 120°46’30” E., off Jolo, Philippine Islands. 
Remarks.—The protuberance on the dorsal surface of the genital 
segment in the female and the complicated structure of the male fifth 
legs are identifying characters. 
Genus MACROSETELLA A. Scott, 1909 
MACROSETELLA GRACILIS (Dana) 
Setella gracilis DANA, Proe. Amer. Acad. Arts and Sci., vol. 1, p. 154, 1847; United 
States Exploring Expedition, 1838-1842 (Wilkes), vol. 14, pt. 2, Crustacea, 
p. 1198, 1853; pl. 84, fig. 3 a—g, 1855. 
Stations 19-21; 38; 48; 64; 65; 71; 73; 3799; 3800; 3878; 3980; 
4037; 4952; 5102; 5120; 5133; 5180; 5186; 5208; 5293; 5227; 5230; 
5263; 5801; 5308; 5312; 5320; 5334; 5340; 5849; 5358; 5386; 5399; 
5414; 5422; 5424; 5430; 5431; 5437; 5488; 5489; 5530; 5601; 5646; 
5647; 5651; Sabtan Island, and Iloilo Straits, Philippine Islands; Fiji 
Islands; Niuafu Island. This species occurs in all the plankton Lists, 
is pelagic in its habits, and is widely distributed in the Tropics. 
Genus MECYNOCERA I. C. Thompson, 1888 
MECYNOCERA CLAUSI I. C. Thompson 
Mecynocera clausi I. C. THompson, Journ. Linn. Soc. London, vol. 20 (1890), p. 
150, pl. 11, 1888. 
Stations 2; 3; 7; 9; 11-14; 16; 19-21; 25-27; 29; 32; 33; 35; 36; 
39; 41; 44; 52; 54; 62-65; 75; 76; 79; 3799; 3800; 4010; 4190; 4681; 
4700; 4701; 4705; 4707; 4715; 5120; 5240; 5320; 5437; Fiji Islands. 
Identified by Sars from 25 of these Albatross stations with four figures 
and from 6 Monaco stations and present in the Siboga and Carnegie 
planktons. It is found in all the larger oceans. 
Genus MEGACALANUS Wolfenden, 1904 
MEGACALANUS LONGICORNIS (Sars) 
Macrocalanus longicornis Sars, Bull Mus. Océanogr. Monaco, No. 26, p. 7, 1905a. 
Megacalanus longicornis Sars, Rés. camp. sci. Albert de Monaco, No. 69, p. 11, pls. 
ee LO2D. 
Stations 65; 4652; 4655; 4661; 4663-4665; 4667; 4669; 4671-4673; 
4675; 4676; 4679; 4681; 4683; 4700; 4707; 4711; 4715; 5120; 5185; 
5287 ; 5820; 5495; 5553; H. 3789. Identified by Sars from 18 of these 
Albatross stations and 44 Monaco stations; found also in the Siboga 
and Carnegie planktons. It is widely distributed, especially in the 
Tropics. 
MEGACALANUS PRINCEPS (Brady) 
Calanus princeps BRravy, Voyage of H. M. S. Challenger, Zool., vol. 8, pt. 23, Cope- 
poda, p. 86, pl. 4, figs. 8-7, 1883. 
