REPORT ON THE SCHIZOPODA. 201 



The carapace is rather large, completely covering the trunk, no segments of which 

 appear exposed. It is very slightly emarginate posteriorly and has rather a deep cer^'ical 

 sulcus, marking off its anterior part. The frontal margin is evenly arched at the sides, 

 and forms in the middle a slight angular projection. The antero-lateral corners are bnt 

 slightly produced and obtusely rounded. 



The caudal segments are somewhat depressed and of uniform breadth, being much 

 narrower than the anterior part of the carapace. The last segment is remarkably 

 elongate, almost as long as the three preceding ones taken together. 



The eyes are claviform, with the cornea somewhat expanded, and exhibiting a dark 

 coloured pigment. 



The antennular peduncle is comparatively very powerfully developed, about half as 

 long as the carapace, and has the last joint distinctly the largest. Of the flagella, the 

 outer one is remarkably elongate, almost equalling the whole body in length. 



The antennal scale (see fig. 20) would seem to be constructed upon the same type as 

 in the two preceding species, being rather short as compared with that in most other 

 Mysidans, though not quite so rudimentary as in the other species of the genus, reaching, 

 as it does, to about the middle of the antennular peduncle. The apex is somewhat 

 obliquely truncate, with the denticle of the outer corner well defined. The basal part of 

 the flagellum projects beyond the tip of the scale, as in the two j^receding species, and 

 has the middle joint by far the largest. 



The legs appear to be rather slender, but have the terminal part comparatively short, 

 and composed of only three articulations. 



The marsupial pouch w^as greatly developed in both specimens, forming a very large, 

 almost semiglobular prominence issuing from beneath the posterior part of the trunk. 



The caudal limbs would seem to be exceedingly small, well nigh obsolete. 



The telson is rather elongate and narrow, but its form could not be exactly made out 

 in the specimens examined. 



The uropoda have both plates about equal, and fringed with long set^. The auditory 

 apparatus within the base of the inner plate is distinctly developed. 



Habitat. — The two specimens in the collection were taken in the Celebes Sea, 

 October 22, 1874; lat. 5° 44' N., long. 123° 34' E.; at Station 199, most probably at 

 the surface of the sea. 



Genus 6. Mysidopsis, G. 0. Sars, 1864. 



Myddopsis, G. 0. Sars, Beretuing om en i Sommeren 18G3 foretagen zoologisk Eeise, Xyt Magazin 



f. NaturviJ., 1864. 



I 



Generic Characters. — Carapace comparatively small, not completely covering the 

 trunk ; frontal margin more or less produced in the middle. Eyes w^ell developed, 



(ZOOL. CHALL. EXP. — PART XXXVII. — 1885.) Oo 26 



