854 MRS. E. W. SEXTOX OX AMPHIPODA [Nov. 23, 



apex of the triangle at the insertion of the palp ; the stiong 

 ridge which runs down from this point to the posterior end of 

 the spine-row carries the molar on its inner surface at the base. 

 When the mandible is in position, this ridge hides the molar from 

 view ; in the figures both mandibles are turned to show the 

 molar. The molar is oval, the crown indented in the middle, 

 with faintly marked but distinct transverse lidges. Cutting -plate 

 on the right mandible (fig. 3) strong and curv^ed, divided into 

 8 teeth, the terminal tooth broad and truncate, the 2 above large 

 and pointed, and the 5 upper ones small and rounded ; no 

 accessory plate. On the inner surface the cutting-plate is so 

 ridged as to give the appearance of the teeth being coalesced for 

 nearly the whole length of the plate ; the apices of the teeth are 

 considerably bevelled also, presenting a broad, ridged edge. Buch- 

 holz considered the formation to be due to the accessory plate 

 having become coalesced with the cutting-plate in both mandibles. 

 The left mandible (fig. 4) possesses a well-developed accessory 

 plate, the margin of which is divided into 9 teeth, the lowest 

 tooth being the largest. The cutting-plate is strongly curved, 

 the upper half arching over almost at light angles to the lower 

 portion ; the upper portion has 5 or 6 very small rounded teeth, 

 the lower being divided into 3 large, rounded teeth, bevelled and 

 ridged as in the right mandible. The 'two plates are set very 

 closely together ; Buchholz in his figure confused them, and 

 represented them as one plate, with 2 rows of teeth on the 

 mai'gin. There are 4 spines in the left sjnne-roio ; 6 in the 

 right. The spines are short, stout, and have a downy appear- 

 ance, being covered with microscopic spinules ; behind each spine 

 a few fine hairs are inset. The palp is exceedingly large ; the 

 2nd joint lightly curved, with 2 strong spines ; the terminal joint 

 the longest, falciform, and covered on the outer surface with 

 minute spinules. It carries on the inner margin 5 feathered 

 spines in the right mandible, 4 in the left. 



Maxilla 1 (fig. 5). — Outer plate broad, with 2 rows of strong 

 spines at the apex ; 5 in one row, graduated in size, curved and 

 bifurcate ; 4 in the other row, longer, more slender, and finely 

 serrated. The inner plate is small and rounded, widening at the 

 apex, and provided with 1 plumose seta, in place of 5 setfe 

 figured by Buchholz. Palp long and slender ; the apex of the 

 terminal joint carries 7 simple spines, 4 on the margin and 3 inset 

 submarginally. 



Maxilla 2 (fig. 6). — Buchholz's description is incorrect. Both 

 plates are broad and rounded ; the outer is longer and only 

 slightly narrower than the inner, and carries 1 short and 5 long 

 stiff setse apically ; the inner plate has shorter curved setse on the 

 inner margin and a few fine hairs. 



Maxillipeds (fig. 7). — Plates small and nairow. The inner 

 plate has the inner margin straight, with 1 strong tooth inset, 

 the outer margin convex, and the apex trunca,te and beset with 

 2 small teeth and 2 small setiform spines. The outer plate only 



