DISCOVERY REPORTS 



Description. Side-plate 3 minutely beaded on lower margin. Postero-inferior 

 angle of pleon segment 3 quadrate. 



Gnathopod 1 , 6th joint not quite as long as 5th, ovate, no distinct palm, lower margin 

 with marginal spines and numerous setae. Gnathopod 2, 2nd and 3rd joints channelled 

 in front, with rounded lobes distally, 5th bluntly lobed below, the lobe not produced, 

 no brush of fine setae, but with a few long setae, and a graduated row of spines on distal 

 margin, 6th ovate, palm longer than hind margin, in S with a flat tooth near hinge 

 followed by a small notch, another notch in front of the shortly produced defining 

 angle, in $ minutely crenulate, with a small median notch. 



Fig. 61. Proboloides porcellanus, n.sp. a. Gnathopod i. b. Gnathopod 2 of $. c. Gnathopod 2 

 of ?. d, Peraeopod 5, with portion of hind margin of 2nd joint further enlarged. 



Peraeopod 3, 2nd joint narrow linear, but hind distal angle produced in a short 

 rounded lobe. Peraeopods 4 and 5, 2nd joint expanded at base, then rapidly narrowing, 

 somewhat like that of Metopella neglecta (Sars, pi. xcvii, fig. 2), but the proximal ex- 

 pansion not extending half-way down the joint, 4th joint moderately expanded. 



Telson and uropod 3 unarmed. 



Remarks. This species is at once distinguished by the excavate hind margins of 2nd 

 joints of peraeopods 4 and 5. The beading on side-plate 3 is much finer and more close- 

 set than in the other species. The colour (as preserved) is an opaque creamy white like 

 porcelain. 



Genus Thaumatelson, Wlkr. 

 Walker, 1907, p. 21. 

 Chilton, 1912, p. 481. 

 Chevreux, 1913, p. 109. 



Thaumatelson nasutum, Chevr. 



Chevreux, 1912, p. 5; 1913, p. 109, figs. 16-18. 

 Chilton, 1912, p. 483, pi. i, figs. 16, 17 (inermis). 



