582 " THETIS " SCIENTIFIC RESULTS. 



Hyperiidea are separated fi'oni the tribe Gammaridea and the 

 family Caprellidse. Normally, the so-called palp of the maxilli- 

 peds consists of the last four joints of the appendage in the 

 Amphipoda. These are reduced to two in Kroyer's genus 

 Lafystius of the Gammaridea. In the tribe Caprellidea the 

 family Cyamidfe includes species from which the palp of tlie 

 maxilliped disappears in the adult stage, though it may be, and in 

 one case certainly is, present in the young^. It would, in my 

 opinion, be very inexpedient to see in these rare exceptions any 

 ground for fusing the tribes together. 



OCHLESIS INNOCENS, sp. nov. 



(Plate xlviii.). 



Stations 35, 57. 



Head rostrate, rostrum bending over between the first antennae, 

 lateral corners triangularly produced between fiist and second 

 antenuEe. Peraeon and first three segments of pleon sharply 

 carinate, fourth segment of pleon rather elongate, fifth and sixth 

 apparently coalesced into one short segment. Body much com- 

 pressed, except (in female) at middle of peraeon, the specimeus 

 in general much resembling Lepidepecreum foraminiferwm of the 

 Challenger Expedition. First side-plate with bulging front 

 margin, second longer, nearly parallel-sided, third again longer, 

 similar in shape except for a widening both ways at the top, 

 fourth wider than the rest, the lower part of the hind margin 

 deeply excavate, the fifth at the upper part shallowly produced 

 forward. Postero-lateral angles of first two pleon segments 

 rounded, the third having a little straight tooth, which is not 

 produced from the lower margin but from a point just above it. 

 Eyes of moderate size, near the margin of the lateral process of 

 the head, pale in preserved specimens. First antennae having the 

 first joint deep, produced below into a long tooth, second joint 

 longer but less deep than the first, similarly produced, the tooth 

 reaching beyond the third small joint and more than half-way 

 along the small conical flagellum, which is tipped with several 

 filaments and setse attached to the conical joint and to two or 

 three microscopical following joints. Second antennae about as 

 long as first but otherwise much slighter, last joint of peduncle 

 the longest, flagellum conical, smaller than that of the first 

 antennae, with a minute second joint tipped with setae. Upper 

 lip membranaceous, broad, narrowing to a little bulb, followed 

 by an acute apex. Lower lip matching the upper, the principal 



' P. Mayer— Fauna Flora Neapel, xvii., 1890, p. 146, 



