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STALK-EYED CRUSTACEA. 



pair of legy. A flat, rather stiff, rounded plate projects outward from the 



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similar but narrower process is found on the proximal segment of the second 

 pair of legs, closely applied to the outer and hinder part of the basal segment 

 of the first pair of legs. This process is also found in S.ferox, altho 

 not mentioned nor figured byG. 0. Sars, It is present, too, in S. 

 and S. procax. 



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(igassimi 



Of the five hithertx) known species of Sderocrangon^ viz. horeas (Fab.), sale- 



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species. The peculiarities of the genus Sderocrangon are so fully described 

 and figured by Sars in his account of S. ferox (Norske Nordhavs-Exped., 

 Crustacea, I. 15-26, Plate IL, 1885), that it would be superfluous to give a 

 detailed description of S. atrox. Let it suffice to point out the specific dif- 

 ferences between these two species : in S. ferox the upturned rostrum is 

 simple, while in S, atrox a long acute tooth, given off from its ventral side, 

 reaches as far forward as the tip of the rostrum ; in other words the ros- 

 trum is bifid in the vertical plane. In the former species the dorsal carina) 

 of the sixth abdominal segment bear two pairs of well developed spines, 

 while in the latter we find but one pair of very small spines at the posterior 

 end of the carina?. The j)leural spines of the abdomen are much longer in 

 the former species than in the latter, and on the fifth somite there are four 

 to five spines on each pleura, against two in 8, atrox. The eyes are much 

 smaller in S. ferox, and are destitute of the spine above the cornea which 

 is seen in S, atrox. Finally, in Sars's species the antenna! scale is much 



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* Cheraphilm ferox G. 0. Sars, Arch, for Mathcmatik og Naturvidcnskab, IL 339, 1877 ; Bvlerocrangon 

 salebrosusQ. 0. Sars, T3cji Norske Nordhavs-Expcd., Crustacea, I. 15, 1885 {nee Owen); Selerocranrjon 

 ferox Hansen, Dijmphna-Togtets Zoolog.-Bot. Udbytto, p. 230, 1887. G. 0. Sars says iJiat llie Mediter- 

 ranean species. Cancer caiaphradm Olivi {Egeon loricatm Risso), perhaps belongs to tlie genus Meroeran- 

 gon. If tills were so, the name HcUroeramjOri would liare to give way to Egeon Eisso. But examination, 

 of Olivi's species shows that Sars's surmise is incorrect. The rostrum in this species is short and bifid, the 

 antennal scale short and broad, the inner branch of the abdominal appendages is large (subequal to the outer 

 branch), and furnished with a stylamblys on every pair; there are six well developed gills on eaefi side of tlic 

 body, a small podobranchia at the base of the second maxlllipcd, and tiie basal segment of the first pair of legs 

 bears a uniartlculate exopod. Risso's genus Eyeon [M/rr-on] (Hist. Nat. des Crustaces dcs Environs de Nice, 

 p. 99, 1816), established to receive this species, is based on valid structural characters and should be restored 

 {v. Ortmann, Zoolog. Jahrb., Abth. f. Syst., V. 530, 535, 1890). S})ence P>;d,e's Poniocaris (Rep. Chal- 

 lenger Macrury, p. 495), appears to be the same as Egeon. Miers (Ann. Mag. Nat. Illsfc. 5th Series, VIII. 

 365, 1881) assigns CaMcer cataphraclm Olivi to the genus CherapUlm, altliough this species was made the 

 type of the genus Egeon by Risso forty-six years before the name CherajiUlus was proposed by Kinahan ! 



Pontophilus jacqueli A. M. Edw., Comptes Rcndus, XCIII. 935, 1881 ; Rccueil de Eigures dc Crus- 

 taces nouv. ou pen connns, 18S3. Closely allied to, if not the same as, S. agcmizii Smith (Bull Mus. Comp 



Zooh, X. 32, 1882), 



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