c 



REPORT ON THE AMPHIPODA. 1125 



The Eyes small, irregularly round, situate on the lateral lobes of the head. 



Upper Antennse. — The first joint about as long as the head, with a short stiff spine 

 at the lower apex, and slender spines there and elsewhere ; the second joint longer and 

 much thinner, with several groups of slender spines and spinules ; the third joint about 

 one-third the length of the second, similarly curved ; the flagellum much longer than the 

 peduncle, having (on one of the specimens) forty-six joints, very slender towards the 

 distal end of the flagellum. There is on the distal end of the third joint of the peduncle 

 a little setuliferous (seemingly jointed) tubercle, that may be regarded as a remnant of a 

 secondary flagellum. This, however, is not so long as what Czerniavski figures, in 1868, 

 for the secondary flagellum of (jhwbia taurica and describes as minutissimo. In 

 Amphithoides longicornis, Kossmann, 1880, the secondary flagellum though not as long 

 as the first joint of the primary, consists of a long and a short joint. 



Lower Antennse. — The first two joints very short, closely coalesced, the gland-cone 

 decurrent ; the third joint short, but longer than the coalesced first and second, carrying 

 some slender spines of various lengths ; the fourth joint much thinner and longer than 

 the third, rather longer than the second of the upper antennas, carrying several slender 

 spines ; the fifth joint thinner and a little shorter, similarly furnished ; the flagellum of 

 about five and twenty joints, together longer than the fourth and fifth of the peduncle 

 united, the terminal joints long and slender. 



Upper Lip rather broad, the distal margin not quite evenly convex, since the broad 

 central part projects slightly, this part being strongly furred all round. 



Mandibles. — The cutting edge divided into seven or eight teeth ; the secondary plate 

 with four teeth on the right mandible, and five on the left ; the spine-row consisting of 

 nine very slender spines, curved and denticulate ; the molar tubercle strong, with sharp 

 slender teeth round part of the crown, broad teeth or transverse plates on the side, and 

 at one corner a slender spine ; the first joint of the palp not quite twice as long as broad, 

 the second about twice the length of the first, widening a little distally, with some spines 

 at the apex in front ; the third joint rather longer and broader than the second, widening 

 a little distally, and on the convex sloping apical border carrying about twenty long 

 denticulate spines, the longest on the apex of the hind margin ; there are also one or two 

 spines on the surface very near the apex of the front margin, which is shorter than the 

 hinder one. 



Lower Lip. — The principal lobes dehiscent, strongly cfliated on the inner margin, at 

 the top of which there is a wide and deep emargination, by which a narrow distal lobe is 

 formed, directed inwards, the outer or distal border smooth, but the sinuous inner border 

 cdiated ; the inner lobes are long, much wider at the oval distal part, which is very 

 strongly ciliated, than at the squared base ; the mandibular processes large, divergent 

 with the outer margin very convex. 



First Maxillse. — The inner plate small, widening from a narrow base, the inner 



