REPORT ON THE AMPHIPODA. 203 



not meution the ventral median spine on tlie second perseon-segment of the male. Kr0yer 

 caUs attention to the great difference between the adult males and females, especially 

 shown in this, but existing also in other, species of Caprdla. 



''Cercops HolhuUi Kr. (Tab. VI. fig. 1-13)," from South Greenland, is described in detail. It 

 is still the only known species of the genus. In regard to the quinque-articulate pleon, in 

 a note Kmyer says, " it is possible, as in itself not improbable, that the pleon consists of 

 six rings, in that the ring which I have treated as the fifth, is perhaps composed of two 

 pretty closely united." 



" JEffina longicorniti Kr. (Tab. VII. Fig. 1-12)," also from Greenland, is next described. 



At page 585 begins the description of " Caprella iHlaiala Kr. (Tab. VIII. fig. 1-9)," from Rio 

 Janeiro. TMayer identifies it with the earlier CcqircUa acuHfroris, Latreille. " Caprella 

 septentrionalits Kr. (Tab. VIII. fig. 10-19)," already alluded to in previous papers, is here 

 fuUy described, without the reference to " Squilla lohata Fabr. Fn. Gr. n. 225," given in 

 Gronl. Amph. It is said to be the commonest of the Cajirellina in Greenland. 



For " Caprella luhata Miill. (Tab. VII. fig. 24-28) " Krtiyer gives the references 



"Miiller, Zool. dan. Prodr., n. 2359 : Squilla lobata. 



" — Zoologia dauica, fasc. 11"', pag. 21 : Squilla quadrilobata. 



" — — — fasc. 111"^ pag. 58 : Gammarus quadrilobatus. 



" Linne, Systema nature, edit. XII"°, pag. 1056 : Cancer linearis? 



" Pallas, Spicil. zool. IX. 78 : Onisous scolopendroides t 



" Zool. danica tab. 56 fig. 4-5 i og tab. 114 fig. 11-12 ? ." 



These are followed by a full description, winding up witli the discrimination of three varieties 

 as follows : " var. a. superficies dorsalis annuU thoracici qvinti, sexti, septimiqve aculeis 

 destituta. var. /3. superficies dorsalis annuli thoracici qvinti, sesti septimiqve aculeis 

 destituta ; lamina brauchiales suborbiculares. var. y. caput annulusque thoracis secundus, 

 tertius qvartusqve aculeis nodisve minutissimis prredita." Mayer assigns the species, with 

 varieties a and y, to the name Capi-ella linearis (Linn.) Bate. var. /3., he thinks may 

 belong to Kroyer's Caprella septentrionalis, though that itself, he supposes, may be but a 

 variety of Caprella linearis. 



" Caprella Hystrix Kr. (Tab. VIII. fig. 20-26)," of which the largest specimen was only 

 about 3'" long, is regarded by Mayer as, with little doubt, a young form of Capi-ella 

 aeaiithifera. Leach, and quite distinct from the Caprella hi/stri.r of Bate and Westwood. 



" Lepitomera pedata Abildg. (Tab. VII. fig. 13-23)," receives a full description, preceded by 

 the following references and synonyms : — 



" Miiller's Prod ramus, n. 23G0 : Squilla ventricosa (.§imncn). 



■' — Zool. dan. Fasc. II"', pag. 20 : Sq. ventricosa (^unncii). 



" Abildgaard, Zool dan. Fasc. Ill"', pag. 33 : Gammarus pedatus (J^aimcil). 



" Desmarest, Consid. s. les Crustaces pag. 276 : Leptomera ventricosa ( p ). 



« — — — — — — Proton pedatum {S & P )• 



"Latreille i Ciiviers Regno an. IP"" ed. IV, pag. 128 : Naupredia ■? 



" ZooL dan. tab. 56 fig. 1-3 ( P ) og tab. 101 fig. 1-2 ( $ )." 



Kr0yer notices the incorrectness of the view propounded by Eschscboltz, 1830, that Lepfnmera 

 rubra. Lam., might be regarded as a synonym of Cajjrella scolopendroides, Lam. He recognises 

 the priority of the name ventricosa, but rejects it for the insufficient reason that its meaning 

 is only suitable to the female. Mayer reinstates it, in the title Proto ventricosa, O. F. 

 Miiller. 



