NEREILINUM MURMANICUM 



167 



its ventral side it bears, one behind the other, a series of large conical 

 papillae, spaced at equal intervals (Fig. C92G). On the dorsal side, opposite 

 each papilla a glandular shield, shaped like a figure-of-eight, projects 

 slightly. 

 The range of sizes (in mm) amongst the specimens available is as follows : 



Length of tentacles 8-23 



Length of the fore-part of the body 1 -4-3-4 



Breadth of the mesosoma 0-15-0-32 



Length of the metameric region 3-5-1 1 -0 



Length ofthepreannular region 14-52 



Length of the postannular region up to 45 



Total length of the body without tentacles up to 80 mm 



Total length of the body including tentacles up to 103 mm 



In one male I have found a large number of cigar-shaped spermatophores 

 about 0-1 mm long (Fig. C92H). The filament is very long and fine. 



The yellowish brown ringed 

 tube is unsegmented. The front 

 part is limp, transparent and 

 yellowish, and contains circular 

 fibres in its walls (Fig. D92A). / 

 Then, little by little, grey-brown 

 rings appear, about as long as 

 the tube is wide. They are rather 

 regular and have a matt surface. 

 The interspaces between the 

 rings are colourless and trans- 

 versely wrinkled (Fig. D92B). 

 The longest tube reached 236 

 mm ; the diameter near the front 

 end varied between 0-24 and 

 0-275 mm. 



At first glance, from the de- 

 velopment of two tentacles, one 

 might place this species in the 

 genus Diplobrachia. Several im- 

 portant features, however, ar- 

 gue against placing it in this 



, . , , , . Fig. D92. Nereilinum murmanicum. Tube, 



genus Which belongs to the Л -front end; Я -middle part. (Ivanov, 1961a.) 



