270 CEYLON PEARL OYSTER REPORT. 



about 1 milliin. without feet, 2 millims. inclusive. Anterior setae compound, falcigerous, 

 bidentate, in about 30 segments ; thereafter simple furciform setae ; in the posterior 

 segments some of the furciform setae become quasi-compound. Dorsal cirri of about 

 40 anterior segments long, with a tendency to alternate longer and shorter ; afterwards 

 they become shorter, subfusiforni, still alternating. Tentaculum impar with 27 joints ; 

 paired antennae, about 10 joints; dorsal tentacular cirrus, 18-20 joints; first dorsal 

 cirrus, 34 joints ; posterior dorsal cirri, 8-12 joints. Pharynx black in segments 3-20 ; 

 proventriculus in segments 20-28. 



2. Length 15 millims., 83 segments followed by about a dozen regenerating 

 segments showing small compound setae of the usual type. Compound setae in anterior 

 28 segments. 



3. Length 22 millims. ; segments 118 ; compound setae in 28 anterior segments; in 

 segments 29-90 simple furciform setae ; in segments 91-118 the falcigerous bidentate 

 setae re-appear. Pharynx brown in segments 1-13 ; proventriculus 14-20. Tentaculum 

 impar moniliform, 18 joints; dorsal cirrus of first setiger longest, with 20 joints. 



Autolytus orientalis, n. sp. Plate IV., figs. 81 to 84. 



Locality: Found in plankton, 2nd and 3rd March, 1903, North-east Cheval. 

 Several stoloniferous specimens; total length 10 to 20 millims. 



In the example figured (Plate IV., fig. 81) there are 29 setigerous segments in the 

 anterior or parent individual. The parapodia contain two aciculae and numerous, 

 upwards of 20, compound falcigerous setae ; the head of the shaft is laciniate and the 

 appendix is minutely bidentate and minutely fringed (Plate IV., tig. 84). The dorsal 

 cirri are rather short, lanceolate, petaloid, with strong basal articulation. The second 

 dorsal cirrus, i.e., the cirrus of the first setiger, is the longest. The rounded reduced 

 palps, joined together in the middle line along their own length, are only visible from 

 below (Plate IV., fig. 83). The pharynx is long and has a sigmoid flexure ; it is 

 armed in front with a circle of 44 denticles, larger and smaller irregularly alternating 

 (Plate IV., fig. 82). The proventriculus shows 28 glandular rows. 



Family: NEREID^E. 

 Nereis indica, Kinbekg. 



KlNBEKG, ' Ainmlata nova Nereidum dispositio nova,' ' Ofv. Akad. Forh.,' 1865, p. 169. 



Locality : Galle, from buoy ; one female containing ova. 



Length 50 millims., inclusive width 4"5 millims. Tentacular cirri not long, reaching 

 to third segment ; antennae f length of prostomium ; palps long with narrow terminal 

 appendix ; eyes large, equal, the posterior rather closer together. Body incomplete 

 behind, 77 setigerous segments. 



Feet subequal ; dorsal cirri of anterior segments about twice as long as the blunt 

 dorsal ligule ; ventral cirrus not reaching the trp of the ventral ligule ; in the middle 

 segments the neuropodia and the bases of the cirri become membranous, the dorsal 



