POLYCrLETA. 273 



with Nereis unifasciata (q. v.). Antennae shorter than proboscis, eyes in a wide 

 trapezium or subrectangle ; third tentacular cirrus reaches back to seventh segment. 

 Posterior segments with brown glandular tracts on the dorsal sides of the segments 

 and on the bases of the parapodia (Plate IV., fig. 91). Feet equal, dorsal cirrus 

 longer than dorsal ligule ; in the anterior feet there are prominent labia pharetrarum 

 (Plate IV., fig. 90). 



Dorsal setae homogomph spinigerous ; superior ventral setae homogomph spinigerous 

 and heterogomph falcigerous ; inferior ventral setae homogomph spinigerous and 

 heterogomph falcigerous. The paragnaths do not quite agree with Grtjbe's formula, 

 but I think nearly enough to determine the species : I., 0, II., a double oblique row, 

 3 or 4 larger in the hinder row, 4 or 5 smaller in the front row; III., 1 ; IV, an 

 acervus of 8, two very small in front, three rather larger in the middle and three still 

 larger behind. The actual length of the third tentacular cirrus is about 2 millims. 



The Ceylon specimen seems to agree with Grube's C. pectinifera in all characters 

 except the mouth-parts and with C. lapinigensis in respect of the mouth-parts. The 

 maxillae show 5 blunt teeth. Perhaps the two forms are co-specific. The arrangement 

 of the setae in the foot is not described by Grube in either of his species. The 

 peculiarity here is the occurrence of homogomph spinigerous setae as well as hetero- 

 gomph falcigers in the inferior ventral group. In Ceratonereis costce, according to 

 Ehlers (' Borstenwiirmer,' p. 525), there are only falcigerous setae in the inferior 

 ventral group. It is uncommon to find homogomph spinigers in the inferior ventral 

 fascicle. 



Platynereis bengalensis, Kinberg Plate IV, figs. 92 to 94. 



Muttuvaratu Paar, March 29. One specimen, incomplete behind, 45 setigerous 

 segments, width over setae 4 millims. 



Description of a foot from anterior region (9th foot of right side) : Dorsal cirrus 

 normal, 2|- times the length of the dorsal ligule, which is short, rounded, and bulky ; 

 inferior dorsal ligule like the superior; ventral ligule like the dorsal ligules; ventral 

 cirrus not reaching the end of the ventral ligule. Dorsal setae homogomph spinigerous ; 

 superior ventral setae homogomph spinigerous and heterogomph falcigerous (appen- 

 dices simple, fringed, short) ; inferior ventral setae heterogomph, spinigerous and 

 falcigerous. 



Description of the 44th foot of right side : A large brown glandular tract divided 

 into two portions at base of dorsal cirrus ; ligules obtusely pointed, more than half the 

 length of the dorsal cirrus (ventral ligule rather shorter than the two dorsal ligules 

 and narrower at its base). Dorsal setae homogomph spinigerous and falcigerous ; 

 superior ventral homogomph spinigerous and heterogomph falcigerous ; inferior ventral 

 heterogomph spinigerous and falcigerous. The appendix of a dorsal falciger is guarded 

 and unfringed ; its extremity is boldly hooked, and at the vertex of the hook there is 

 a small tooth in front of which the guard makes another slight projection (Plate IV., 



