172 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
fifth legs, shown on plate 22, figure 303, are almost exactly like those 
of Paracalanus parvus, but the female from which they were taken 
was fully three times as large as a parvus female. 
Genus BRADYIDIUS Giesbrecht, 1897 
Undinopsis “Sars in litt.,”’ ScHNrErpER, Tromsd Mus. Aarsheft., vol. 7, p. 1381, 
1884 (nomen nudum). 
Bradyidius GIESBRECHT, Zool. Anz., vol. 20, p. 253, 1897. 
Bradyanus VANHOFFEN, Zool. AnzZ., vol. 20, p. 322, 1897a. 
Undinopsis Sars, Crustacea of Norway, vol. 4, p. 31, 1902; and other authors. 
Bradyidius A. Scorr, Sidoga-Expedition, monogr. 29a, pt. 1, p. 39, 1909. 
Undinopsis Witson, U. S. Nat. Mus. Bull. 158, pp. 552, 554, 555, 19382: Carnegie 
Inst. Washington Publ. 536, p. 210, 1942. 
[As the correct name for this genus has long been in question and no 
satisfactory decision could be reached regarding it from the synonymies 
or arguments advanced by any of the authors concerned, original 
sources were directly consulted. ‘To save others the time it has taken 
us, the results of this study are set forth below. 
Undinopsis appears first to have been used by J. Sparre Schneider 
(1884, p. 181),> who credited the name to Sars “in litt.” No matter 
which of the two was the author, the name is without standing, as 
neither the genus nor its unique species, bradyi, was diagnosed, nor 
was any particular type or previously published species cited at the 
time. 
Bradyidius was proposed by Giesbrecht (1897, p. 253) for a species 
mistakenly identified by Brady (1878, p. 46) as the Pseudocalanus 
(now Aetidius) armatus of Boeck (1872, p. 38). Giesbrecht’s (1897, 
p. 253) Bradyidius unquestionably takes precedence over Bradyanus 
Vanh6ffen (1897a, p. 322). Vanhdéffen based his claim to priority on 
the fact that his name had been published before Giesbrecht’s in con- 
junction with the name of a new species, Bradyanus armatus, by Chun 
(1897, p. 28). Chun, however, merely listed identifications supplied 
him by Vanhdéffen from the latter’s then unpublished manuscript on 
the Fauna and Flora of Greenland (1897b, p. 292). Although this 
paper appeared in the same year, it was antedated by Giesbrecht’s 
by some months. Precise dates cannot now be obtained, but it is to 
be noted that Giesbrecht’s article appeared on page 253 of the Zoologi- 
scher Anzeiger with the printed annotation “eingeg. 9. Juli 1897,” 
whereas Vanh6ffen’s article, which appeared on page 322 of the same 
®In J. Sparre Schneider only the following is given regarding the genus (and species) in 
question: ‘74. Undinopsis bradyi G. O. Sars in litt./Af denne hidtil ubeskrevne art, der er 
en virkelig bund-/form, medbragtes endel eksplr. fra samme lokalitet som fo- regaaende. 
Jeg har ogsaa fundet den ved Troms¢.”’ (Of this hitherto undescribed species, which is a 
true bottom form, a number of specimens were obtained from the same locality as the fore- 
going [species, Calanus finmarchicus]. It has also been found near Tromso.—Translation 
by Dr. Adam G. Béving.) 
