State of Washington, in February and March 1920. 179 



Family CIRRATULIDiE. 



Cirratulus robustus Johnson. 



Cirratulm robustus Johnson, 1901, Polychieta of the Puget Sound Region, Proc. Boston 



Soc. Nat. History, 29, p. 423, pi. 14, figs. 149, 150. 

 Cirratulus cingulatus Johnson, loc. cit., p. 422, pi. 14, figs. 145 to 148. 



Living specimens are usually dark olive-green in color, but in some cases they may 

 be almost black. The region in front of the tentacles is yellowish brown in most 

 cases, but one specimen was nearly colorless. On the tentacles are bright scarlet spots 

 looking like the eyes of a sabellid, arranged in an irregular row. The prostomium 

 (fig. 36) has on either side a row of dark eye-like spots. The first somite has a curved 

 anterior margin following the outline of the corresponding margin of the prostomium. 

 Laterally and ventrally this somite is shorter than on the dorsal surface. A prolonga- 

 tion of the second somite extends dorsally into the first. Later somites are much 

 shorter than either of these. 



A comparison of Johnson's descriptions of his two species shows that in the general 

 form of the body, the distribution of the cirri, the form of the setae, the general form 

 of the head region, and the arrangement of the eye-spots the two are alike, the only 

 differences being that in C. cingulatus the somites are ringed and the large cirri are on 

 somite 8, while in robustus the somites are smooth and the large cirri are on somite 4. 

 In this genus the first three somites are long and there is a tendency toward surface 

 wrinkling. It seems to me that the difference Johnson described in tentacle position 

 was an error, due to mistaking surface wrinkles for somite boundaries, and I ha\'e 

 therefore combined the two species. 



Collected at Jurn Island and Minnesota Reef near Friday Harbor. 



Family OPHELIID.ffi, 



Ammotrypane brevis Moore. 

 Ammotrypane brevis Moore, 1906. Proc. Acad. Nat. Sci. Phil. 58, p. 354, with 1 figure. 



Specimens of this genus collected at Friday Harbor, while one-third longer than the 

 single specimen from Alaska on which Moore founded this species, agree with his 

 description in every detail except two. The first is that the prostomium is not as 

 definitely dorso-ventrally flattened as in Moore's description, a difference which might 

 be due to the preservation, and the second is the structure of the pygidium. Moore 

 notes: "If perfect, as it appears to be, the pygidium presents striking characters. 

 The large, median spoon-shaped lobe of A. aulogasier is absent and represented only 

 by a minute slender process. The lateral lobes are much larger, obliquely truncated 

 above, and slightly indented at the end." In the Friday Harbor specimens the 

 pygidium has a short hood, overhanging dorsally the anal opening, and continuing 

 so far toward the ventral surface that the ventral margins are almost in contact. 

 The margin of this lobe is drawn-out into cirrus-like processes. In all of the three 

 individuals at my disposal the ventralmost of the processes are thick, elongate- 

 elUptical in outline with constricted bases (fig. 37). Dorsal to these the margin of the 

 hood bears a series of slender processes. In the three specimens there were, respect- 

 ively, 4, 5, and 7 of these processes, varying in size, but always slender. A single 

 slender cirrus arises from the ventral mid-line of the body, and may extend beyond 

 the other processes as in the one figured, though in another it was shorter. In the 

 third specimen it had evidently been lost. 



Collected at Friday Harbor. 



