plaque each. The broad dorsal ciliated 

 band begins at the front edge of the 

 trunk (Fig. Е144Я). 



The very long cylindrical nonmeta- 

 meric part of the preannular region 

 has numerous scattered papillae bear- 

 ing oval cuticular plaques. At the front 

 end of the nonmetameric region the 

 papillae are sparse, then they increase 

 considerably in number, especially on 

 the sides of the trunk where they be- 

 come numerous (Fig. E144C). Finally, 

 in front of the zone of thickening the 

 number of papillae falls again. In many 

 places in this part of the trunk the dor- 

 sal and ventral blood vessel and the 

 pyriform glands lying in the coelom 

 are visible through the integument. 

 The zone of thickening, lying a con- 

 siderable distance in front of the 

 girdles, consists of ten large conical 

 papillae crowded together higgledy- 

 piggledy on the ventral side (Fig. 

 F144D). Behind them the preannular 

 region of the trunk continues with 

 small scattered papillae. 



The cuticular plaques of the meta- 

 meric papillae are oval with a dark 



Fig. E144. Heptabrachia ctenophora. A - fore- 

 part of the body from the ventral and, B, from the 

 dorsal side ; С - part of the non-metameric region 

 of the trunk from the ventral side. 

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

 bridle; ms - mesosoma; tnts - metasoma; p - 

 cuticular plaques; pa - papillae; ps - protosoma; 

 s l - groove between the protosoma and mesosoma ; 

 s 2 - groove between the mesosoma and metasoma; 

 s 3 , s* - secondary mesosomal grooves; sv - ven- 

 tral sulcus ; t - tentacles ; w - ventral blood vessel 

 seen by transparency. (After Ivanov, 1962b.) 



