134 STALK-EYED CRUSTACEA. 
pair of legs. A flat, rather stiff, rounded plate projects outward from the 
second segment of the third maxilliped, as in S. ferox, agassizii, and procax. A 
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, although it is 
not mentioned nor figured by G. O. Sars. It is present, too, in S. agassizii 
and S. procaz. 
Of the five hitherto known species of Sederocrangon, viz. boreas (Fab.), sale- 
brosa (Owen), angusticauda (De Haan), ferox (G. O. Sars),* jacqueti (A. M. Edw.),t 
and agassizii Smith, S. ferox bears the closest resemblance to the present 
species. The peculiarities of the genus Sclerocrangon are so fully described 
and figured by Sars in his account of S. ferox (Norske Nordhavs-Exped., 
Crustacea, I. 15-26, Plate I., 1885), that it would be superfluous to give a 
detailed description of S. afror. Let it suffice to point out the specific dif- 
ferences between these two species: in S. feror the upturned rostrum is 
simple, while in S. afrox 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 carinz 
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 carine. The pleural 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 S. atrov, The eyes are much 
smaller in S. ferox, and are destitute of the spine above the cornea which 
is seen in S. a/ror. Finally, in Sars’s species the antennal scale is much 
* Cheraphilus feror G. O. Sars, Arch. for Mathematik og Naturvidenskab, IT. 339, 1877 ; Sclerocrangon 
salebrosus G. O. Sars, Den Norske Nordhavs-Exped., Crustacea, I. 15, 1885 (wee Owen) ; Selerocrangon 
ferox Hansen, Dijmphna-Togtets Zoolog-Bot. Udbytte, p. 236, 1887. G.O. Sars says that the Mediter- 
ranean species, Cancer cataphractus Olivi (Leon loricatus Risso), perhaps belongs to the genus Sclerocran- 
gon. If this were so, the name Selerocrangon would have to give way to Hyeon Risso. 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 
branck), and furnished with a stylamblys on every pair; there are six well developed gills on each side of the 
body, a sinall podobranchia at the base of the second maxilliped, and the basal segment of the first pair of legs 
bears a uniarticulate exopod. Risso’s genus Hyeon [ Ay@on| (Hist. Nat. des Crustacés des 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). Spence Bate’s Pontocaris (Rep. Chal- 
lenger Macrura, p. 495), appears to be the same as Hyeon. Miers (Ann. Mag. Nat. Hist. 5th Series, VIII. 
365, 1881) assigns Cancer cutaphractus Olivi to the genus Cheraphilus, although this species was made the 
type of the genus Hyeon by Risso forty-six years before the name Cheraphilus was proposed by Kinahan ! 
+ Pontophilus jacqueti A. M. Kdw., Comptes Rendus, XCIII. 935, 1881; Recueil de Figures de Crus- 
tacés nouy. ou peu connus, 1883. Closely allied to, if not the same as, S. agassizit Smith (Bull. Mus. Comp 
Zool., X. 32, 1882) 
