1342 THE VOYAGE OF H.M.S. CHALLENGER. 



during the voyage. This specimen was taken towards the close of the voyage, and 

 appears to agree closely with that last mentioned. 



Remarks. — The specific name — meaning tvhose you please — refers to the difficulty of 

 deciding whether the various specimens belong to a distinct species or to one of the 

 five or six specific names with which Claus and Bovallius have endowed the genus 

 Paraphronima. None of the species bearing those names have been at all fully 

 described, and there seems some probability that a single name may suffice for them 

 all. 



Family Phronimid^e, Dana, 1852. 



For Dana's account of the family, see Notes on Dana, 1852 (pp. 259, 261). For the 

 definition by Claus, see Note on Claus, 1879 (p. 487). Bovallius in 1887 gives the 

 following diagnosis : — 



" Head large, tumid, more or less conical, much deeper than the body. Eyes large, 

 occupying parts of the sides and the top of the head. First pair of antennae fixed at the 

 anterior side of the head ; with a multiarticulate flagellum (in the male) ; second pair 

 fixed at the anterior side of the head, multiarticulate (in the male) or rudimentary (in 

 the female). Mandibles without palp. Seventh pair of pereiopoda not transformed 

 [_Fifth Perseopods normal]. Peduncles normal." 



From this family Bovallius excludes the Phrosininse and also two of the genera of 

 Claus' Phroniminae, namely Paraphronima and Phronimopsis. He adds a new genus, 

 Dairella. In the expression " peduncles normal " there is evidently some omission or 

 other error of the press. If, as is probable, the expression intended was — uropods normal 

 — the liability of the second pair to become rudimentary should not be left unnoticed. 



Genus Dairella, Bovallius, 1887. 



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

 Akad. Handl., Bd. 11, No. 16, p. 24. 



For the definition of this genus, together with that of the subfamily Dairellinse, in 

 which Bovallius places it, see Note on that author, 1887 (p. 589). It will be remembered 

 that the expression — " first and second pairs of pereiopoda simple " — refers to the first 

 and second pairs of gnathopods, and that the expression — " all the pereiopoda are simple 

 walking legs " — includes the two pairs of gnathopods, as well as the five pairs of perasopods. 

 That the differences between this branch of the Phronimidas and the family Paraphro- 

 nimidse are not at the first glance very striking may be inferred from the circumstance 

 that Dairella californica was originally named Paraphronima californica, before it was 

 made the type of the new genus, but, besides the distinct character of the antennae, to 



