REPORT ON THE AMPHIPODA. 413 



1872. Glaus, C. 



Zur Naturgeschiclite cler Phronima sedentaria Forsk. Mit Tafel xxvi. xxvii. 

 Zeitschrift filr wissenschaftliche Zoologie. Bd. XXII. pp. 331-338. 



Claus here states his conviction that the cell inhabited by Phronima is derived exclusively 

 from smaller or larger specimens of Pyrosoma eaten out for the purpose. He describes 

 the dLfferences presented by the male form of Phronima sedentaria. Gu&in's Phronima 

 atlantica he regards as nothing but " das noch jugendliche, kleine, aber doch schon fort- 

 pflanzungsfiihige Weibchen " of the same species, and thinks that Spence Bate did wrong in 

 giving a separate specific name, "Phronima Borneensis," to White's variety of Phronima 

 atlantica from Borneo. Compare Note on Streets, 1877. 



Referring to his own earlier observation of rudiments of a secojid jiair of antennas on the head 

 of the young PhronimeUa elongata, he says that he wrongly concluded that the Phronimidaj 

 in general might have both pairs of antennse in rudiment to start with, the females 

 eventually developing only the front pair. He found, however, that in the little, sexually 

 indifferent, young ones of Phronima sedentaria there was no trace of the hinder pair ; 

 in individuals 4 mm. long sexual difference was shown in the front antennse, and in larger 

 forms the position of the coming second pair of antennse was indicated. The sexual organs 

 of the male are described and figured. 



1872. Cope, E. D. 



Descriptions of species from the Mammoth Cave. The American Naturalist. 

 Vol. VI. July, 1872.-NO. 7. Vol. VI. Salem, Mass. Peabody Academy of Science, 

 1872. pp. 421-422. 



The new genus which Cope established for the Gammarid, which he found in the Mammoth 

 Cave, is thus described : — 

 , " Sti/gobromus, Cope, Gen. nov. Gammaridarum. Near Gammarus. The first antennae with 



flagellum, and much shorter than the second. Two jjairs of limbs chelate by the inflexion 

 of the last claw-like segment ; other limbs clawed. Terminal abdominal segment very 

 short, spiniferous ; the penultimate segment with a stout limb with two equal styles, the 

 antepenultimate short, two-jointed and undivided. Eyes none. 



" This genus is nearer to the true Gammarus than the allied genus described from the Austrian 

 Caves, the Niphargus of SchiiJdte (Proc. Entom. Soc. London, 1851, p. 150). In the 

 latter the first antennte are the larger, and the body terminates in a very long style ; the 

 last abdominal limb is undivided like that which precedes it. In Stygohromits the 

 penultimate limb is like that represented by Schiodte for Niphargus, though I am not 

 certain whether it is homologically identical. The last limb is about equally divided, but 

 the simple basis is long and stout. 



" It is just possible that the antepenultimate limb represents the basis and one style only, for in 

 that of one side a sliglit process appears at the extremity of the basal segment, though it is 

 not visible on that of the other. The terminal limbs are recurved and appressed to the 

 last abdominal segment, forming a fulcrum or prop. The animals of tliis genus are aquatic, 

 and swim much as the common Gaminari. The absence of eyes is another example of the 

 adajjtation to darkness." 



The type species he describes thus : — " Stygohromus vifreus, Cope. ' Gammaroid Crustacean ' 

 Cope, Ann. Mag. Nat. Hist., Nov., 1871. Two last pairs of Umbs appressed to last 



