REPORT ON THE PHYLLOCARIDA. 15 



The anterior lip (fig. 8) forms a rounded fleshy prominence issuing from the antennal 

 segment and projecting backwards so as to cover the masticatory parts of the mandibles. 

 It is slightly emarginate at the free terminal edge and finely ciliated on each side of the 

 emargination. 



The posterior lip I have not succeeded in isolating from the surrounding parts. In 

 Nebalia it constitutes a rather small bifid lobe, limiting the oral orifice posteriorly. 



The mandibles (fig. 1, M ; fig. 9) have the body comparatively small and tapering 

 above to a narrow point reaching rather far up the sides of the body (see fig. 1). The 

 masticatory part is strongly incurved so as to form a right angle with the body. It has 

 the cutting edge quite rudimentary, only forming a small, undivided dentiform projection 

 (see fig. 10), whereas the molar tubercle is well developed, cylindrical in form, and 

 terminating in a large fluted molar surface. No difference wdiatever can be detected in 

 the armature of the two mandibles. The palp (fig. 11) is very fully developed, being 

 twice as long as the mandible (see fig. 9) and generally pointing obliquely anteriorly so 

 as to reach the inferior edge of the carapace (fig. 1, Mp). It is rather slender and 

 composed of three well-defined joints, the first comparatively short and unarmed, the 

 second very elongate and somewhat curved, bearing at the posterior edge four slender 

 bristles, and at the opposite side near the end another recurved seta. The last joint is 

 nearly as long as the preceding and strongly compressed, forming an oblong vertical 

 lamella, slightly dilated at the middle and provided along the outer part of the posterior 

 edge with a double series of densely ciliated bristles arranged in a comb-like manner and 

 increasing in length towards the tip. As to structure, the mandibles in the present form 

 agree fairly well with those in Nebalia, excepting that the cutting edge is still more 

 rudimentary, and that the last joint of the palp is somewhat differently formed. 



The first pair of maxillae (fig. 1, m 1 ; fig. 12) exhibit two well-defined and rather 

 dissimilar masticatory lobes, and a slender recurved palp. The outer masticatory lobe is 

 rather narrow and strongly incurved, with the apex abruptly truncate and armed with a 

 double row of strong equal-sized spines, besides a few slender bristles, one of which, 

 affixed at a short distance from the apex anteriorly, is somewhat stronger than the others 

 and finely ciliated. The inner masticatory lobe is considerably shorter than the outer 

 and has the form of a rounded lamella, finely ciliated along the free edges and, besides, 

 provided with a row of about twelve strong ciliated setae, curved anteriorly and forming 

 together a broad fan. The palp, which is movably articulated to the end of the basal 

 part, at the base of the outer masticatory lobe, is very elongate and slender. It exhibits 

 at the base two imperfectly defined segments, forming together a more or less sharp bend 

 and followed by a very narrow setiform terminal part, projecting obliquely posteriorly 

 along the sides of the trunk (fig. 1, m 1 ). The latter part is provided along the lower 

 edge with about fifteen extremely slender unciliated bristles, the posterior of which are 

 rather regularly arranged, two issuing from the tip. In the structure of these maxillae, 



