i 4 EXPEDITION ANTARCTIQUE BELGE 



behind the eye. The antennal squama is shaped nearly as in Michtheimysis mixta, lanceolate, long 

 and very narrow, seven times or more longer than broad, closely set with setœ along both 

 margins ; a distal short part is marked off by a transverse suture. 



Left mandible (fig. 3 c) has the molar process short with its end eut off obliquely and even 

 a little concave behind (fig. 3 e) ; the second joint of the palp is more than twice as long as broad 

 (fig. 3d). The maxillulse (fig. 3/) do not présent any aberration worth mentioning from those in 

 Macromvsis ftexiiosa ; my figure shows the constituting éléments, but it may be pointed out that 

 the basai joint itself and the major part of the second joint as situated on the upper surface are 

 hidden when the maxillula is seen from below, and they are therefore indicated by dotted Unes. 



The maxillae (fig. 3 g) differ from those of M. flexuosa especially in the shape of the 

 terminal joint; this joint is so much expanded inwards that it is considerably broader than 

 long, more than half of its distal margin is nearly straight, and most of this margin is beautifully 

 adorned with a close row of ver)' characteristic setse. The figure shows the constituting éléments, 

 viz. the chitinous plates and two membranous areas — the latter are marked by uniformly 

 greyish shading — but a description is omitted, because the lettering and the explanation 

 of the plates may be sufficient for the morphological understanding. 



The maxillipeds (fig. 3 h) agrée closely with those pf M. flexuosa, differing from those 

 of M. mixta in various minor particulars, especially in having the lobe from the fourth joint 

 short, while it is long in M. mixta. The first pair of legs (fig. 3 i) are very similar to those 

 of M. flexuosa. 



The telson is in large spécimens (fig. 3 /) a little more than three times as long as 

 broad, decreasing somewhat but not gradually in breadth from near the base to a little in 

 front of the end, where it gradually becomes slightly broader; the incision, which occupies 

 one-fourth of the total length, is narrow in the proximal half, narrowing strongly in its distal, 

 feebly in the proximal half. The outer margin of the telson is armed with a very large 

 number of small spines, the end of each distal lobe terminâtes in a rather small but strong 

 spine (fig. 3 m), and the margins of the incision are furnished with a nearly innumerable 

 multitude of closely set spines which are longest not far from the terminal spine and from 

 hère decrease slightly in length behind and considerably towards the bottom of the incision. 

 In the small spécimen the telson (fig. 3 k) has its distal fourth somewhat différent : the outer 

 margins of this part converge conspicuously behind, and the incision is consequently less 

 broad at its distal end. 



Length of a female with marsupium from the end of rostrum to the tip of telson 47 mm. 



Colour. — The large spécimens were « blanc translucide avec taches ruber pâle sur 

 tout le corps ; yeux noirs ». The small spécimen, which measures 18 mm., was « transparent 

 avec taches ruber ». 



Localities. — Lat. 7i°oo/ S., long. 8g°i5' W., May 11, 1898, dredge ; two large spéci- 

 mens. — Lat. 7o°48' S., long. gi°54' W., April 27, 1898, swab; one small spécimen. 



Distribution. — Holt & Tattersall mention two spécimens from lat. 78 25' 45" S., 

 long. i65° 3g' 6" E. — Coutière enumerates many stations from the area explored by the 

 French Expédition. 



