1348 THE VOYAGE OF H.M.S. CHALLENGER. 



1879. Phronima, Claus, Der Organismus der Plironirniden, p. 4. 

 1879. Phronima, Grenadier, Untersuch. iiber das Sehorgan der Artliropoden. 

 1881. „ Delage, Appareil circul. des Crust, edriophth. marins, Arch, de Zool. Exp. et 



Gen., vol. ix. (p. 90, sep. copy). 



1881. „ Gordon, The Scottish Naturalist, vol. vi. p. 56. 



1882. „ Streets, Study of Phroniniidaa N. Pacific, Proc. U.S. Nat. Mus., vol. v. p. 4. 



1884. ,, Claus, Elementary Text-Book of Zoology (translation by Sedgwick, pp. 452, 455). 



1885. „ Carus, Prodromus Faunae Mediterranean, pars ii. p. 423. 



188G. „ Gerstaecker, Bronu's Klassen und Ordmmgen, Bd. v. Abth. ii. p. 488. 



1886. ,, Thomson and Chilton, Trans. New Zealand Inst., vol. xviii. p. 150. 



1887. „ Bovallius, Systematical List of Amph. Hyper., Bihang till K. Svensk. Vetensk.- 



Akad. Handl., Bd. 11, No. 16, p. 25. 

 1887. „ Giles, On six new Amphipods from the Bay of Bengal, Journ. Asiat. Soc. 



Bengal, vol. lvi. pt. ii. No. 2, p. 212. 



For the original definition of the genus, see Note on Latreille, 1802 (p. 72), but this 

 definition is less to the purpose than the original description of the type-species, Cancer 

 sedentarius, for which see Note on Forskal, 1775 (p. 38). Forskal speaks of ten feet on 

 each side, explaining that of these twenty feet seven pairs belonged to the thorax. 

 Latreille, thinking apparently only of thoracic feet, changed twenty into ten, and the 

 fifth pair of feet into the third, ignoring the two pairs of gnathopods. What Latreille 

 intended by the "salient setaceous palps" is not quite clear. The mandibles in this 

 genus are without palps in both sexes ; the lower antennas are multiarticulate only in the 

 male. For the definition of the genus by Claus, see Note on Claus, 1879 (p. 487). 



Claus, in his Text-Book of Zoology, translation by Sedgwick, 1884, says (p. 455) that 

 the female of Phronima " lives with its offspring in Pyrosoma and Diphyidse, Mediter- 

 ranean." This may throw some light on the mysterious genus Diphyicola, Costa, 1862. 



Phronima pacifica, Streets (PL CLIX.). 



1877. Phronima pacifica, Streets, Bulletin of the U.S. Nat. Mus., No. 7, p. 128. 

 1882. „ „ Streets, Proc. U.S. Nat. Mus., vol. v. p. 6, pi. i. figs. 3, 3a. 



Postero-lateral angles of the first three pleon-segments scarcely produced or acute, the 

 third segment not so deep as the second. 



The Eyes, Antennae, and Mouth-Organs agree very nearly with the corresponding- 

 parts as figured and described by Claus for Phronima sedentaria (Forskal), the differences 

 being of a minute character and in some instances possibly depending only on the 

 particular view obtained of the organs ; for example, in our specimen no marginal teeth 

 could be perceived on the finely furred edges of the outer plates of the Maxillipeds, but 

 these plates had two little setules at the apex, and two on the outer and one on the 

 inner margin. 



First Gnathopods. — First joint nearly as long as the following four, second longer 

 than broad, third scarcely longer than the second, the projecting distal margin straight, 



