ATLANT. DEEP-SEA EXPED. 1910. VOL. III). 



PELAGIC NEMERTEANS. 



15 



Pkallonemertes Murrayi. 

 Catches made by the "Michael Sars" 1910. 



Calculated 



depth 



( 2 / 3 of the 



length of 



wire out). 



meter 



Length of 

 wire out. 



meter 



Station and duration of haul. (H = hours). 



Total- 

 number of 

 specimens 



53 



64 



81 



82 



84 



92 



6 H. 



During 

 whole day 



3 H. 



3.5 H. 



4 H. 



4 H. 











1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 







66 



100 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



o 



133 



200 



1 sn. 



1 sn. 



1 sn. 



1 sn. 1 sn. 



1 sn. 







200 



300 



y- 



y- 



y- 



y- y- 



y- 







400 



600 



y- 



3 A sn. 



3 A sn. 



3 A sn. 3 U sn. 



3 A sn. 







666 



1000 



-k sn. 

 (1100 m. wire) 



y- 



y- 



y- . i y- 



y- 







1000 



1500 



y- 



(1600 m. wire) 



X 



3 A sn. 



3 A sn. 



3 A sn. 



3 A sn. 







1333 



2000 



y-2 sn. 

 (2400 m. wire) 



y- 



y- 



y- 



y- 



y- 







1666 



2500 



3 In. 

 Ill 



(2600 m. wire) 



3 /t sn. 



3 A sn. 



3 h sn. 



3 A sn. 



X 



3 



2000 



3000 



X 



3 In. 

 II 



3 In. 

 VIII 



3 In. 



I 



y- 



I 



3 In. 

 II 



14 



For explanation of the al notation, see the table pag. 11. 



branch. Musculature of the wall of the proboscis 

 sheath composed of an inner layer of longitudinal 

 and outer of circular fibres. Testicles numerous, 

 arranged in two longitudinal rows in the head, 

 along the lateral nerves. 



Chuniella nov. gen. 

 Characters of the family. 



Chuniella lanceolata nov. sp. 



(Textfig. 1). 



This species presents a combination of characters 

 rendering it impossible to place it in any of the other 

 families; I have therefore, despite the fact that only one 



specimen exists, and this moreover, evidently a very young 

 individual, found it necessary to give it a separate family 

 and genus, to which, as far as can be seen from the 

 descriptions, Burger's (6) Drepanophorus pelagicus, and 

 Planktonemertes agassizi likewise belong. 



From the appearance of the specimen, I took it at 

 first for a young stage of Nectonemertes, and no special 

 habitus figure was therefore made, but only an outline 

 drawing, which I here reproduce (Textfig. 1, p. 16). A 

 series of sections afterwards made, however revealed quite 

 a different structure. 



The development of the testicles shows that we 

 have here to deal with a young specimen, and the dimen- 



