432 PART II. SYSTEMATIC ACCOUNT 



Usually the dorsal ends turn somewhat forwards and run near to each other 

 (Fig. 167Д E). The toothed platelets of the girdles are very numerous and 

 crowded together into many rows (Fig. IblF). They are oblong, with a 

 narrower front end which forms a sort of head-piece bearing the anterior 

 group of teeth (Fig. 167G). This head-piece is not, however, sharply defined 

 as it is in L. zachsi. The platelets are yellowish, but those which lie on the 

 hind edge of the girdle may be blackish instead in some individuals. They 

 measure 16-22/x long. Immediately in front of the girdles may be observed 

 a cluster of adhesive papillae, lying in disorder on the ventral side (Fig. 

 167 D). Between the girdles lie one to five small papillae with plaques on them, 

 while there is always a solitary large mid-ventral papilla behind the girdles in 

 the front part of the postannular region. All the papillae are furnished with 

 somewhat bent, transverse rod-like plaques. The long postannular region of 

 the trunk differs little from that of L. zachsi. The papillae are arranged in 

 transverse metameric rows on the ventral side (Fig. 167 #), and in each row 

 there are, for the most part, seven small papillae, each of which has a thin, 

 slightly bent, transverse rod-like plaque, 30-45ju, long. In the hindmost rows 

 there may be up to nine papillae and on the hind end of the body the papillae 

 are not individually formed but run into one another (Fig. 167//). 



All known specimens of L. johanssoni are nearly equal in body size. 

 Therefore, though not one of them is complete, we may gain a good impres- 

 sion of the proportions of a normal adult. Thus, the overall length of the 

 body, including the tentacular crown, must be с 15-16 cm. The maximal 

 lengths of the parts of the body are as follows: the tentacular crown, 12 mm; 

 the fore-part of the body, 3 mm ; the preannular region of the trunk, 80 mm, 

 of which the metameric part accounts for 20-24 mm; the postannular region 

 60 mm. The breadth of the fore-part of the body and that of the front end of 

 the trunk are both about 1 mm. 



The living animals are whitish and through the body wall the red blood 

 may be seen in the blood vessels. 



The spermatophores are strongly flattened and leaf-like, rounded at the 

 filamentar end and pointed at the opposite end (Fig. 655). The filament of 

 the spermatophore is broad at first, then rapidly tapering into the base of the 

 very long, slender part. The sperm are thread-like and lie inside the sperma- 

 tophore parallel to each other, forming two main bundles between which lies 

 a narrow clear strip free of sperm. The spermatophores are 0-52 mm long by 

 0-24 mm broad. 



The straight thick-walled unbending tube is very rigid and varies in shade 

 from light to dark brown or almost black. It has a smooth surface and consists 



