^^-•^i 



Microcotyle sebastis Goto--Parasitizes the gills of Sebastodes 

 schlegelii (Hilgend, ). Just as among M. pomatomi Goto, the adult worms 

 of this species (Fig. 244), are distinguished by the powerful development 



of the disc, but in contrast to the 

 latter species, bear only 25 to 30 

 clamps. Similarly the sex atrium 

 of M. sebastis is equipped with 

 nunnerous little thorns but of differ- 

 ent shape and greater number than 

 among M. pomatomi. We obtained 

 free -swimming larvae of this 

 species in July 1949 in Vladivostok. 

 They emerge fromi the eggs on the 

 10th to the 11th day after deposition 

 of the latter. They have an elongated, 

 cigar-shaped body (Fig. 245) with a 

 well-developed attaching disc. The 

 iMH X^-::m^Wi length of the larva is 0.0 18 to 0.022 mm, 



with a width of about 0, 05 mm. The 

 ciliary covering of the larva is 

 ;7j;;i;; strongly developed so that during 



the observations of live subjects 

 its seems that it covers all the edges 

 of the body. Actually, however, the 

 ciliary epithelium is distributed into 

 three zones just as it is among M. 

 pomatomi. The interior organization 

 of the larva has not been studied by 

 us. There is a well-developed pig- 

 mented eye lying at the end of the 

 first third of the body. The attach- 

 ing armature of the larva consists 

 of 2 pairs of middle and 5 pairs of 

 edge hooks (Fig. 246). The edge 

 hooks and the 2nd pair of middle 

 hooks have absolutely the same structure as in M. pomatomi. The 1st 





Fig. 244. Microcotyle sebastis 

 Goto, adult worms from the gills 

 of Sebastodes shlegeli (Hilgend. ) 

 from the region of Yablichnoii 

 (southern Sakhalin, Sea of Japan). 



pair of middle hooks resembles that of M 



thinner and straighter. The length of edge hooks is 0.013 



pomatomi but is considerably 



016 mm; p. 210 



0. Ulb mm; 



of the 1st pair of middle hooks is 0. 042 - 0. 045 and 2nd pair 

 0. 026 - 0. 029 mm. We did not succeed in observing the subsequent 

 stages of the developnnent of this species. 



Microcotyle gotoi Yamaguti--is encountered very often on the 

 gills of Terpugs--Hexagrammos octogrammus (Pal.). In contrast to all 

 preceding ones, this species has a disc which extends considerably for- 

 ward along the sides of the body so that the ovary and the testes lie behind 

 the upper edge of the disc and of the clannps located on it (Fig. 247). 



228 



