76 THE ANNELIDA POLYCHAETA. 



median ceratophore, and about three fifths as thick distally. The ceratophore 

 and filament are blackish with the light subterminal and terminal portions as 

 in the median tentacle. The lateral tentacles are decidedly more slender than 

 the median and ai'e about two thirds as long. (Plate 4, fig. 1). 



The palpi are stout structures projecting laterally beyond the prostomium; 

 they are much thickened or swollen a little above the proximal end, where they 

 narrow evenly and conspicuously to an acute point, but present no abruptly 

 thinner apical filament. In length they about equal the median tentacle. They 

 are pale throughout. 



The parapodia of the peristomium are long, reaching much beyond the tip 

 of the tentacular ceratophore, the portion distad of this level being fully three 

 fourths the length of the ceratophore. The cirri agree in form and color with 

 the tentacles; the -dorsal cirrus is rather longer than the lateral tentacle and 

 ventral one clearly and considerably shorter than the dorsal. (Plate 4, fig. 1). 



The body, as usual, has twenty-five setigerous somites following the peri- 

 stomium. The nephridial tubercles begin on the sixth somite. On this somite 

 the tubercle is short and inconspicuous but on the others the tubercles are promi- 

 nent- each projects ectocaudad and ventrad and at the distal end is clavately 

 swollen and may curve more strongly ventrad. 



A pair of low dorsal tubercles occur on somite I and also less prominently 

 on II and III, but on succeeding somites none are evident in the type. 



There are the usual twelve pairs of elytra occurring on somites II, IV, V, 

 VII and succeeding odd numbered somites to XXIII. The elytrophores are 

 prominent, cyhndrical or subcylindrical trunks with broadly elliptic cross-section, 

 or these somewhat flattened or indented on one side; similar but more rounded 

 prominences occur on the somites not bearing elytra. The elytra are broadly 

 subelliptic membranous scales of moderate size with their long axes in situ in 

 most obUque. They may meet at the middle of the dorsum but do not overlap 

 and may have a narrowed naked stripe between them; the elytra in the series 

 on each side overlap a little but the imbrication is not particularly strong. On 

 the first elytra there is a series of rounded bosses or tubercles along the caudal 

 border and continuing along the ectal but not the mesal end; those over the 

 middle of the series are large and the others decrease in size from there both 

 ways; these tubercles are separated by a distance mostly two or three times 

 their own diameter; in front of this submarginal series, over the dark areas of 

 the surface and also over the area of attachment, are scattered other similar 

 rounded or hemispherical tubercles of large size with among them similarly 



