450 THE VOYAGE OF H.M.S. CHALLENGER. 



the upper lip, descending into the mouth-cavity." It is this arrangement in connection 

 with the development of the upjser and lower lips, that determines the soissor-like move- 

 ment of the mandibles in this group, which he therefore calls Trochalognatha, thus 

 defined, " MandihiiJae 2^rofluctx, condylo aiiiadario iiistruda: aniico, acetabulo epipharyngif 

 accommodato. Lahrum crassum, ccmicum, simplex." Of this group he considers that 

 there are, as suggested by Kr0yer, only two principal types, Anonyx and Opis, and as the 

 first group correspond with the Onisci, as defined by Schipdte, so this with the Cirolaua' 

 under the same limitation. 



The third type includes the Hyperina, and because the outer lobes of the mandibles are 

 pressed into a transverse furrow of the upper lip he calls this group Piezognatlia, thus 

 defined, " Mandibidx pmdudx, condylo atiiculario aniico carentes, mala exteriorc fossx 

 transvorsie lahri accovimodata. Labruin planiuscid.um, transversum, duplex." 



As abnormal among the Eleutherognatha, the mouth-organs are described of Sterjocephalus, 

 Cyamus and Laphystius. The illustrations are taken from " Caprella septenlrionalis Kr. 

 9 "; "Laphystius Sturionis Kr. $ "; "Cyamus ovalis Eouss. de Vauz. 9 "; "Anonyx 

 Lagena Kr. ? "; " Stegoceplialus Ampulla Kr. 9 "; " Themisto libellula Mandt. ?" 

 " Ancbylomera sp. ? ." 



The English reader will be glad to know that there is a translation of this highly important 

 paper, " partly condensed with the sanction of the author," in the Annals and Magazine 

 of Natural History, for September, 1876. The beautiful and elaborate plates of tlic 

 original do not, however, accompany the translation. 



1875. Simon, Eugene. 



Journal de Zoologie. IV. pp. 114-116. 



He enumerates and shortly describes several species of Crustacea living in ca,ves, among them, 

 " j\'iplia>-(jus subterraneun (Leach) = pjidcanus (C. Koch) aquilex and styyius (Schiiidte), 

 Carniolia, also in wells." (Dr. von Martens, Zool. Eecord for 1875.) 



1875. Smith, Sidney I. 



Report on the Ampliipod Crustaceans. Reports on the Zoological collections 

 of Lieitt. W. L. Carpenter made in Colorado during the summer of 1873. (Ex- 

 tracted from the Annual RejDort of the United States Geological and Geographical 

 Survey of the Territories for 1873. — F. V. Hayden, Geologist in charge.) 

 Washington, 1875. pp. 608-611. Pis. I. II. 



" Hyalell.\, (jenus 7iov," is here defined as in 1874, except that the penultimate segment in the 

 maxilliped-palpus is here said to be "longer than broad." Hycdella dentata, pi. i. figs. 3-6, 

 is again described as " sp. nov." Hyalella inermis, n. s., pi. i. figs, 1-2, is described, 

 " closely allied to the last species, but whoUy without teeth upon the dorsal margin of any 

 of* the abdominal segments." On this, Faxon in 1876 .says, "after an examination of a 

 large number of Hyalella dentala and //. inermis from Utah, I am satisfied that they are 

 but varieties of one species." The policy of coining, or retaining, names for varieties is 

 open to question. Where the variation is not sufficiently important to be regarded as specific, 

 it might well, in my opinion, be left without a special name. In the present instance it 

 seems highly inconvenient to have a species named from a particular character, and a 

 variety named from the absence of that very character. If it is impossible to retain both 



