State of Washington, in February and March 1920. Ill 



broad band of dark-brown pigment extends across the peristomium and is continued 

 anteriorly into a patch of the same color on either side (fig. 22). It is stated by some 

 writers that the nuchal cirri in Onuphis are carried on the peristomium. This I am 

 convinced is a mistake and I regard the apparent first somite as a fusion of somites 

 1 and 2. The apparently second somite is thus really somite 3. A very faint pigment 

 line crosses the posterior fourth of this somite, while behind this two bands occur in 

 each somite — one at the parapodial level and the other near the constriction between 

 the somites, the latter being the smaller. This continues to about somite 20 and from 

 here posteriorly the pigment gradually becomes less distinct, the patch near the inter- 

 segmental constriction disappears, while remnants of the other persist as patches lying 

 along the sides of the somites. They eventually disappear at about the region of the 

 thirtieth somite. In the hving animal the red dorsal blood-vessel and the bright-red 

 gills are noticeable features in the coloration. While these latter colors are lost in 

 the preserved material, the course of the dorsal blood-vessel is marked by a row of 

 spots due to coagulated blood. The pigmentation of the anterior region is retained, 

 but the posterior end of the body is colorless in the preserved material. 



There are two pairs of anal cirri (fig. 23); one pair (the dorsalmost), very long and 

 slender, the others very short. 



The prostomium (fig. 22) is rounded on its anterior margin with the frontal ten- 

 tentacles rather widely separated, the latter elliptical in outline with a narrowed base. 

 The cirrophores of the tentacles have not more than 3 basal rings, not very sharply 

 marked off, and a terminal portion longer than the basal. These cirrophores extend 

 nearly to the apices of the frontal tentacles. The outer paired tentacles have terminal 

 portions about twice as long as the cirrophores, the other tentacles with the terminal 

 portions as much as six times the length of the cirrophores. The terminal portions 

 are slender, rounded at the apex, the unpaired a very little shorter than the inner 

 paired. A very small and inconspicuous eye lies on either side postero-laterally from 

 the base of the inner paired tentacle. The mouth is at the bottom of a broad pit, 

 which is bounded dorsally by the two very prominent rounded palps, and ventrally by 

 a 2-lobed prolongation of the first somite. In form and size these lobes are very 

 similar to the palps, but unlike them, are not fused in the midline. 



The nuchal cirri arise on the anterior border of the (morphologically) second somite. 

 They are conical in form and extend to as far as the terminal third of the cirrophores of 

 the inner paired tentacles. Dorsally somites 1 and 2 are considerably shorter than 

 the prostomium and are together about one-third as long as somite 3. Somite 3 is 

 continued laterally into the first parapodium, of which only the dorsal cirrus is shown 

 in the figure. This parapodium extends to a short distance in front of the anterior 

 margin of somites 1 and 2. The parapodium of somite 4 also shows a forward extension, 

 but this is not so apparent in later somites. Anteriorly the dorsal surface of the body 

 is rounded and the parapodia have in consequence a ventral shifting, but behind somite 

 12 this rounding disappears and the parapodia assume a lateral position, while at the 

 same time the dorsal median line shows a shallow groove. 



There is a large, dorsally directed^ anal opening. A ventral view of the pygidiura 

 (fig. 23) shows the anal cirri, but the preservation was too poor to make it possible to 

 draw the terminal somites and their relation to the pygidium. 



The first parapodium (fig. 24) has a very long cirrus-like postsetal lobe, with rounded 

 presetal lobe. In the specimen figured the dorsal cirrus was bifid at the end, a quite 

 exceptional condition, the usual cirrus being rounded at the apex, with a swollen base, 

 and only a Httle longer than the postsetal lobe. The ventral cirrus is large, lanceolate, 

 arising from a constricted base. There are 2 not very large aciculse, which taper 

 slightly toward the apex until they reach the surface, when they suddenly narrow into 

 very acute tips. A small tuft of needle aciculse extends into the base of the dorsal 

 cirrus. There is a tuft of 5 or 6 very long "semi-compound" setae. 



The tenth parapodium (fig. 25) shows the ventral cirrus changed to the form of a 

 vertically arranged, rather prominent pad, the postsetal lobe and the dorsal cirrus 



