LAMELLISABELLA ZACHSI 423 



row of cuticular bodies on the ventral side. The keels are 60/n wide at 

 the widest part. The transverse horseshoe-shaped plaques are 34/t 

 across. The golden-brown tube is segmented at the front ends. 



4. L. minuta sp. nov. (p. 436). 



4 (3) There are 22-31 tentacles. The diameter of the mesosoma is at least 



1 mm. 



5 (6) There are 22 tentacles. The keels of the bridle consist of clear bars 



with small dark cuticular bodies attached to them behind. The keels 

 are с. 11 0/x broad. The transverse horseshoe-shaped plaques are 

 с 75/x across. The tube is segmented. 



3. L. ivanovi Kirkegaard (p. 434). 



6 (5) There are 28-31 tentacles. The dark-brown or black, homogeneous 



keels of the bridle are 60-70/x broad. The transverse horseshoe- 

 shaped plaques are 60/x across. The tube is unsegmented. 



1. L. zachsi Ushakov (p. 423). 



/. Lamellisabella zachsi Ushakov (Figs. \B, 2, 17£, 19Д 163-5) 



Ushakov, 1933: 205-8, Figs. 1, 2; Johansson, 1937: 23-6, Figs. 1-4; Reisinger, 1938: 49; 

 Johansson, 1939: 253-68, Figs. 1-7, PI. 1; Ushakov, 1940: 76, 77, Fig. 1; Hempelmann, 

 1943: 78; Beklemishev, 1944: 257-9; Ivanov, 1949: 79-83; Ulrich, 1950: 3-25, Figs. 1; 

 Beklemishev, 1951: 267, 268, Figs. 9, 10; Ivanov, 1951: 740-2, Fig. 1; Hartman, 1951: 

 379; Beklemishev, 1952: 297, Fig. 142; Ivanov, 1952: 372-4, Fig. 1; Ushakov, 1953: 

 179; Zenkevitch, 1954: 75, 77, 78, Figs. 3, 9; Zenkevitch, Birstein and Belyaev, 1954: 66, 

 Fig. 10; Hartman, 1954: 183-5; Ivanov, 1954b: 69-71, Fig. 1; Abrikosov et al., 1955: 

 472, Fig. 467; Ivanov, 1955b: 381-3, Figs. 1, 2; Ivanov, 1955d: 176, 177, Figs. 2, 3; 

 Ivanov, 1955e: 224, PI. LXV, Fig. 1; Ivanov, 1956b: 1865; Ivanov, 1956c: 166; Kirke- 

 gaard, 1956a: 79; Kirkegaard, 1956b: 185, Fig. 4; Abrikosov, 1957: 232, 233, 235, Fig. 2; 

 Alvarado, 1957a: 556; Bruun, 1957: 666; Ivanov, 1957a: 431, 476, 478, 480, 481, 483, 492, 

 495-7, Fig. 59; Ivanov, 1957b: 1127, 1139; Beklemishev, 1958: 88; Vinogradova, 1958: 

 112; Dajoz, 1958: 225, 226, 230, 233, 236-8, Figs. 1, 5, 6; Ivanov, 1958a, 1363-70, 

 Figs. 2-8; Ivanov, 1958b: 1682, 1687-9, Fig. 8; Ivanov, 1960a: 1524, 1530, 1531, 1538, 

 1541, 1559, 1560, 1565, 1570, 1576, 1586, 1590, 1593, 1607, 1608, 1611, 1612, 1613, Figs. 

 1384, 1399, 1401, 1402, 1404, 1406-7, 1409, 1412, 1416, 1426, 1427, 1428, 1430, 1433-5, 

 1438, 1440-4, 1468, PI. 8; Ivanov, 1960c: 6, 7, 8, 10, 14, 24, 25, 27, 44, 49, 51, 56, 57, 

 76, 78, 92, 94, 96, 235, 241, 242-7, 248, 250, 251, 252, 266, Figs. 1, 2, 17, 19, 21, 23, 25-6, 

 28, 31, 35, 45-8, 50, 53-5, 58, 60-4, 87, 163-5, PI. Ill; Ivanov, 1960c: 1378. 



L. zachsi was first described by Ushakov (1933) from incomplete specimens 

 collected in the Sea of Okhotsk. Considering Lamellisabella to be a poly- 

 chaete of the family Sabellidae, Ushakov regarded the crown of tentacles as 

 branchiate filamentar palps, the fore-part of the body as the sabellid collar, 

 and the cuticular plaques of the metasoma he homologized with the chaetal 



