REPORT ON THE SCHIZOPODA. 191 



Habitat. — Of this form, whicli may be regarded a representative species of the genus 

 in the southern hemisphere, several specimens were collected off the Kerguelen Islands, 

 at a depth of 120 fathoms. A single and much larger, though rather mutilated specimen, 

 apparently of the same species, was taken in the Antarctic Ocean from a rather con- 

 siderable depth. The locality is : — • 



Station 153, February 14, 1874; lat. 65° 42' S., long. 79° 49' K; depth, 1675 

 fathoms ; blue mud. 



48. Pseudomma australe, G. 0. Sars (PI. XXXIII. figs. 17, 18). 



Amhlyops ausf rails, G. 0. Sars, Preliminary Notices on the Challenger Schizopoda, No. 4.5. 



Specific Characters.— OcxA-ax plates comparatively smaller than in the preceding 

 species, not occupying the whole breadth of the frontal margin, outer edge smooth, and 

 forming, along with anterior, a projecting corner, from which a longitudinal keel runs 

 across the plate, dividing it into an upper and a lateral area, the latter somewhat hoUowed. 

 Antennular pedtincle short and robust. Antenna! scale twice the length of the 

 antennular peduncle, rather narrow, lanceolate, setose on both edges, spine of outer 

 margin placed close to base of scale. 



Remarks. — Of this species only a fragment — the most anterior part of the body — was 

 found in the collection. This fragment shows, however, some very striking peculiarities, 

 fully warranting the establishment of a new species. I formerly referred it to the genus 

 Amhlyops, but now find it, on closer examination, more properly referable to the 

 genus Pseudomma, the structure of the ocular plates being more in accordance with that 

 in the latter genus. 



Description. — The fragment — comprising the anterior part of the carapace, together 

 with the ocular plates, the antennulfe and antennae — had evidently belonged to a full- 

 grown male specimen. The length of the animal may have probably been about 1 mm. 



The carapace is rather broad anteriorly, with the frontal margin forming an even 

 curve, and the antero-lateral corners almost right-ancrled. 



The ocular plates (see fig. 17) do not occupy the whole breadth of the frontal margin, 

 and exhibit, moreover, a form somewhat deviating from that in the preceding species. 

 They are, as in that species, truncate anterioi'ly, and partly separated in the middle by a 

 short and narrow sinus or cleft, but have the outer edge quite smooth, and forming, 

 along with the anterior edge, a somewhat projecting corner. From the latter a longi- 

 tudinal keel runs across the plate dividing it into an upper part, which is nearly 

 plane, and a lateral one, distinctly hollowed along the middle (see fig. 18). As in 

 the preceding species, no trace whatever of pigment or any visual elements can be 

 detected. 



The antennular peduncle has much the same appearance as in the last species, being 



