Canon A. M. Norman on Biitlnh AmphipoJa. 121) 



wood are different stages of development of the male of this 

 .species. Bovallius regards Ilyperin Ldtreilfei, ^^.-Ivl\v., as 

 a distinct species ; but I agree with Sars in considering that 

 the differences indicated are insufficient for specific distinc- 

 tion, and are in a great measure depenflent on the ages of the 

 indiviihial.s examined. Yet, f"urther, I am unaljjo to hold the 

 ihjperia sjiiitii/eru^ Bovallius, as entitled to specific rank. 

 The chief characters assigned are the spination of the two 

 pairs of gnathopods and the form of the uropods. With 

 respect to the gnathopods, T find that in young specimens of 

 H.galha the spines are sparingly developed, in middle-sized 

 individuals they become more numerous ; in large examples I 

 find them, as in Il.spinigera (Bovallius, l.c.\)\. x. figs. 34-36), 

 encircling the extremities of the carpus of tlie gnathopods 

 and well developed at the dorsal corners. The other points 

 Bovallius especially emphasizes are the short branches of the 

 last uropods. Now in the male sex the branches of the last 

 uropods are always shorter than arc those of the female (com- 

 pare Sars, pi. ii. fig. ua and |»1. ii. fig. 1 us) ; and it is a male 

 which is the subject of Bovallius's figures. Should other 

 authors disagree with my views in this matter, the female 

 specimens of II. galba taken by me at Birturbuy Bay and the 

 one taken off Valentia by the * Porcupine ' are, from the 

 character of their gnathojiods, to be referred to //. spiniqera. 

 Tlie Cancer niedtisaruin of Miiller's ' Prodromus ' was 

 applied by O. Fabricius, in his ' Fauna Groenlandica,' under 

 the nameOni'scus medusarum, to //. galba, and he has been 

 followed by many authors. The Metoecus medasarum (Fabr.), 

 Kroyer and other authors, is Hyperoche tauriformis (Bate & 

 Westwood*). Lastly, Bovallius, Hansen, and S.irs now 

 consider the specific name medusarum {Cancer medusaruntj 

 AlUller) to belong to Ilyperli spim'pes of Jioeek. Miiller 

 applied the specific name to the animal described by Strom, 

 and they doubtless think that weight must be attached to 

 Strom's description of the first two pairs of legs as " hirsute 

 and fluffy, truncated at the apex." Hyperia medusarum 

 (Miiller) thus considered, of which the H. spinipes, Boeck, 

 becomes a synonym, has not yet been found in our seas. 

 TtditruH cyaueiPj Sabine, is indeed regarded as a synonym of 

 U. medusarum [=^spijiipes)j but what the Hyperia cyaneoi 

 of Bate and We^twood (vol. ii. p. ,521) may be it seems 



* I first found this species in Shetlmd, and soon afterwards T. Edward 

 procured it at Banff, and sent a specimen to lue and another to Bate. I 

 recorded the 9j)eciinen3 I had seen in uiy Shetland report as Metovcua 

 tnedusaruw, Kruyer ; Bate and Westwood did n it recognize Edward's 

 specimen as a known form, and df.scribf'd it as Ilijperia tanriformis, a 

 name which now stands. 



Ann. rf; Mmj. N. Hist. Ser. 7. Vol. v. 9 



