1504 THE VOYAGE OF H.M.S. CHALLENGEK. 



Schizoscdus ornatus, Claus. 



1879. Schizoseelus ornatus, Claus, Die Gattungen und Arten der Platysceliden, p. 21. 



1887. „ ,, Bovallius, Systematical List of Amph. Hyper., Bihang till K. 



Svensk. Vetensk.-Akad. Handl., Bd. 11, No. 16, p. 44. 

 1887. „ „ Clans, Die Platysceliden, p. 44, Taf. x. figs. 1-11. 



A small compact species, not easily distinguishable at first sight from Parascelus 

 zebu, from the same locality. Head short, broad, flattened in front, the rostrum having 

 the tip slightly upturned ; the second segment of the perseon not shorter than the first. 



Eyes not covering the whole sides of the head, the ocelli of each eye apparently 

 forming a single continuous group, which is long and rather narrow. 



Upper Antennse.- — First joint of the peduncle not longer than broad, the two following- 

 joints very short, incompletely developed ; the first joint of the flagellum very thick at 

 the base so as to be nearly as broad as the length, one margin very convex, the other 

 almost straight, the narrowed apex having on one side a series of filaments, on the other 

 side the slender second joint which carries a filament and one or two setules ; the third 

 joint is thinner and rather longer than the second, and has a minute setule at the apex. 

 To judge by Claus' account, when these antennas are fully developed the filament-bearing 

 apex of the first joint of the flagellum forms a separate second joint. 



Lower Antennse. — Gland-cone distinct ; third joint of peduncle curved, two-thirds the 

 length of the next, which is slightly sinuous, widest distally ; the fifth joint about as 

 long as the fourth ; the first joint of the flagellum half the length of the last of the 

 peduncle, sinuous ; the second joint straight, longer than the first, sharply bent upon it 

 but scarcely jointed. In the fully developed antennas the proportions of the joints are 

 (bfferent. 



First Gnathopods. — The first joint about as long as the remainder of the limb, the 

 hind margin sinuous ; the second joint scarcely longer than broad, having a spinule on 

 the hind margin above the apex ; the third joint scarcely longer than the second, having 

 a subapical spinule on the hind margin ; the wrist a little longer and stouter than the 

 third joint, with two spinules on the hind margin, and one at the apex of the front ; the 

 hand a little longer than the wrist, and at the base rather narrower, thence tapering, 

 slightly curved, like the three preceding joints having a straight distal margin ; the 

 finger small, thick at the base, then rather abruptly narrowed, the terminal part bent, 

 acute, the inner margin having a small tooth-process not far from the base. 



Second Gnathop>ods. — The branchial vesicles oval, as long as the first joint and con- 

 siderably broader. The first joint longer than in the preceding pair ; the second and third 

 joints rather larger than in that pair, the third joint having three spinules on the hind 

 margin ; the wrist with two spinules on the upper part of the hind margin, its process 

 laminar, as long as the hand and nearly as wide, the apical part triangular, having on 





