490 THE VOYAGE OF H.M.S. CHALLENGER. 



Observations. —The type specimen was obtained at Station 133, associated with 

 specimens of Willemcesia leptodactyla, and Hemipenseus spinidorsalis. The smaller 

 specimens, taken off the eastern coast of New Zealand, at Station 168, in 1100 fathoms, 

 bear a very close resemblance to it, and I am not able to determine any distinction, 

 excepting that the anterior tooth on the gastric region is almost rudimentary. 



One specimen only was taken with ova, and that was trawled at Station 168. The 

 ova are larger than those of Crangon, oval in form and less numerous, and they are not 

 attached like them to the pleopoda, but connected together by a very slender filament ; 

 they lie against the ventral surface of the pleon, protected especially by the inner 

 branches of the pleopoda. 



PontopMlus profundus, n. sp. (PI. LXXXVIII. fig. 1). 



Rostrum reaching beyond the ophthalmopoda. Carapace armed with two strong teeth 

 in the median line, one on the gastric region, the other just anterior to the cardiac region, 

 and two on each side on the branchial region. The third somite of the pleon is dorsally 

 produced to an obtuse point ; fourth somite short and partially covered by the third. 



The second pair of gnathopoda is long and slender, as is also the posterior pair of 

 pereiopoda. 



Length, entire (male), 

 ,, of carajiace, 

 ,, of pleon, 

 ,, of sixth somite, 

 ,, of telson, 



15 mm. (0 - 6 in.). 



3-5 „ 

 11-5 „ 



3-5 „ 



3 „ 



Habitat.— Station 165, June 17, 1874; lat. 34° 50' S., long. 155° 28' E. ; off Sydney; 

 depth, 2600 fathoms ; bottom, red clay ; bottom temperature, 34° - 5. One specimen, 

 male. Dredged. 



*&^ 



Body slender, rostrum sharp, extending to a little beyond the extremity of the 

 ophthalmopoda, and flanked on each side at the base by two small teeth, just above the 

 posterior margin of the orbit. Two strong, anteriorly directed teeth, ecpiidistant from 

 each other and from the apex of the rostrum and the posterior margin of the carapace, 

 are situated one before the other in the median line ; on each side, just on the margin 

 of the branchial region, there is also a sharp tooth, and anterior to it, separating the 

 branchial from the gastric regions, is another simflar tooth. The frontal margin is 

 armed with two short, sharp teeth, one defining the outer angle of the orbit, the other 

 situated just above the infero-anterior angle of the carapace. The ophthalmi are ovate 

 and tolerably large and prominent. The facets (fig. la) are squares. 



The first pair of antennae has the first joint of the peduncle rather long, and excavate 



