ON CRUSTACEA BROUGHT BY DR WILLEY FROM THE SOUTH SEAS. 679 



projections, the upper, which is the shorter, but the more promineut, being cut into 

 five denticles, the lower into ten. Between the upper tooth and the upper process 

 there is a close-set row of short, unequal, delicate spines, and there is similar but 

 less conspicuous armature at other points of the cutting edge. In one mandible the 

 lower tooth has a subsidiary denticle to the rear. 



The first maxillae have a broad fi'ont edge, narrowing backward to a kind of 

 neck. The front edge has three strong spines at the upper corner, which is separated 

 by a notch from the rest of the margin, the spines of which are slighter, but 

 numerous and broken up into slightly separated groups. The cavity formed by the 

 neck is occupied by a thin, smooth plate. As to this the suggestion may be hazarded 

 that it represents the missing lower lip of the cirripedes. 



Second maxillae. These appendages are represented by a pair of oblong plates 

 completely coalescent at the base, their outer ends rounded and fringed with spinules, 

 both surfaces scabrous, but the inner protruding and spinose. 



Cii'ri. The first pair is the longest, and set at some distance from the rest. It is 

 sinuous in shape, the fii-st joint of the peduncle narrow, much longer than the second. 

 The rami are a little shorter than the peduncle, of five or six joints respectively, of 

 which the basal and the penultimate are the longest, the articulations not very distinct 

 and much obscured in the crowd of slender setae. The other five pairs are nearly 

 alike, except that the sixth appears to be rather the longest and to have a narrower 

 peduncle, this having in the others a very broad basal joint. The rami have seven 

 or occasionally eight joints, and are shorter than the peduncle. The upper ramus is 

 the narrower, armed only with a scanty supply of seta-like spines. The lower ramus 

 has here and there a slender spine, but is chiefly remarkable for the short spines on 

 the upper or hind margin of the last four joints, one on the short rounded 

 terminal joint and on the others from three to five, which are short and stout. Dr 

 Willey mentions that the cirri had a white spot on each. 



The pleon is minute. 



An immense number of small fusiform eggs were present iu the specimen. 



It was taken in a fish-basket, at Sandal Bay, Lifu, Loyalty Islands. 



The disk measured 1.5 mm. in length by 11 mm. in breadth. The portion of the 

 animal outside of the disk was about 15 mm. long, of which the capitulum occupied 

 <S mm., with a breadth at the crest of 5 mm. But from Dr Willey's drawing it 

 may be assumed that the animal can extend itself beyond the sheath to about twice the 

 length of the disk. 



It is only fair that Dr Willey's own name should be associated with this highly 

 interesting discovery. 



