LAMELLISABELLA JOHANSSONI 



429 



2. Lamellisabella johanssoni Ivanov (Figs. 34Л, В, C, 655, 166-8) 



Ivanov, 1957a: 475-83, 485, 492, 496-8, Figs. 46-52, 59; Dajoz, 1958: 236; Ivanov, 

 1960a: 1531, 1534, 1538, 1545, 1607, 1613, Figs. 1415, 1446, 1465, 1468; Ivanov, 1960c: 

 6, 12, 24, 30, 92, 94, 97, 242, 244, 246, 247-51, 252, 266, Figs. 34, 65, 84, 87, 166-8. 



The comparatively short fore-part of the body, which is slightly flattened 

 dorso-ventrally, has a length to breadth 

 ratio of 2i-3i : 1 (Figs. 166, 167Л, B, 

 C). On its ventral side runs a shallow 

 median furrow, interrupted in the 

 middle by the keels of the bridle and 

 running into the ventral sulcus of the 

 trunk at its hind end. The cephalic 

 lobe is small and triangular. The 

 powerful coal-black keels of the bridle 

 run forward and quickly taper on the 

 dorsal side. The very thick ventral ends 

 are fused in the mid-line and rise sharp- 

 ly into a crest. Their greatest width 

 reaches 0-135 mm. The dorsal ends 

 of the keels are thin and do not meet in 

 the mid-line. The groove dividing the 

 fore-part of the body from the trunk is 

 pronounced on the dorsal side but im- 

 perceptible ventrally. The tentacular 

 crown, in the four specimens in which 

 it is intact, consists of 18 tentacles 

 fused together into a hollow cylinder 

 (Fig. 166). The distal ends of the ten- 

 tacles are, however, free for a short 

 length, where dense masses of very thin 

 pinnules about 0-13 mm long may be 



Fig. 166. Lamellisabella johanssoni: Front part of 

 the body of a female. 



с - cephalic lobe ; со - dorsal ciliated band ; / - 

 keels of the bridle; pa - papillae; pi - pinnules; 

 s 2 - groove between the mesosoma and the meta- 

 soma; sv - ventral sulcus; ic - tentacular crown. 

 (After Ivanov, 1957л.) 



