18 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 69 



color features in the body, but colored spots are scattered irregu- 

 larly over the entire surface, with a tendency to collect in greater 

 numbers near the anterior end. The faecal groove is relatively prom- 

 inent throughout the entire length of the abdomen, and in the usual 

 fashion, it crosses the ventral face of the anterior abdominal somites 

 to pass to the dorsal surface. The collar is small, straight sided, 

 with a deep notch on either side on the dorsal surface. Toward 

 the median line from these is on either side a rounded lobe, the two 

 not being in contact, and the ventral ends of the collar are prolonged 

 into overlapping lobes. (Fig. 28.) The tentacles are large and be- 

 tween them and the collar, near the mouth, is a pair of prominent 

 rounded lobes. 



The gills are carried on prominent bases, which are united for a 

 short distance by a membrane. This membrane, in a line correspond- 

 ing to a continuation of the free portion of the gill, is colored a deep 

 purple, while between these it is colorless. Throughout their entire 

 extent the gills are marked with alternating bands of purple and 

 white, this coloration extending over the pinnules. A short portion 

 of the apex of each gill is free from pinnules. 



The thoracic setae are all essentially alike in form but differ in 

 length and the larger ones are less broadened toward the end than 

 are the shorter. Both (fig. 29) broaden toward the apex, this 

 broadened portion being striated and they terminate in very fine 

 tips. The uncinus (fig. 30) has a bluntly truncated base, a single 

 prominent tooth, and a denticulated apex. Abdominal setae and 

 uncini are similar to the thoracic in form. 



Collected at Pango Pango, Samoa. The type is Cat. No. 19146 

 of the U.S.N.M. 



Family TEREBELLIDAE 



LOIMIA Malmgren 



LOIMIA MONTAGUI Grube 



Terel)ella montagui Grube, 1878, pp. 224 and 225, pi. 12, fig. 3. 

 Loimia montagui v. Makenzelleb, 1884, pp. 9 to 11, pi. 2, fig. 1. 



As was noted by v. Marenzeller, Grube's description of this species 

 is not very satisfactory and I have based my identification mostly on 

 the description given by the former writer, the important details 

 being the structure of the lobes on the second and third somites, 

 the gills, and the form and arrangement of the setae. Black inter- 

 segmental bands mentioned by Grube do not appear in my material. 

 The tubes have a basal structure of tough material thickly covered 

 on the outside by small pebbles and bits of shell. 



Grube's specimen is recorded as collected at " Canal Lapaing, 

 Philippinen." v. Marenzeller states that his were collected by Dr. 



