NOTES ON SPECIES OP SAGITTA GRAY. 173 



off the coast of West Africa, in latitude 15° N. ; and between 

 Plymonth and Morocco. Already recorded from the 

 Indian, Atlantic, and Pacific Oceans. 



Sagitta regularis Aida. 

 Synonymy. — *S'. hedfordii Doncaster 1902. 



Captured during the voyage from Plymouth to 

 ^lorocco in August, 1919. Alread}' recorded from the 

 Indian and Pacific Oceans. 



Sagitta setosa Langerhans. 



Synonymy. — S. germanica Leuchart 1847; S, 

 hipunctata Busk 1856; S. enflata var. Hallez 1909. 



Individuals of this species were taken during August. 

 1919, off the coast of West Africa, in latitude 15° N. 

 Already recorded from the North Sea. 



Sagitta serratodentata Krohn. 



This species was obtained in August, 1919, off the coast 

 of West Africa, in latitude 15° N. Already recorded 

 from the Atlantic, Indian, Pacific, and Antarctic Oceans. 



Sagitta sp. 



A small unidentifiable Sagitta was obtained during the 

 run from Adelaide to Bass Straits during August, 1919. 



Sagitta atlantica sp. nov. 



(Fig. 1.) 



A transparent but fairly firm form, somewhat 

 resembling S. pulclira, but immediately distinguishable 

 from the latter by the possession of a rayless anterior fin 

 which is shorter than the posterior fin, and by the tip of 

 the seizing jaw. which in S. pulclira has a pronounced 

 swelling. 



Length 7 mm ; width 4-3 per cent, of the total length ; 

 tail length 25 per cent, of the total length. 



Tail to ventral ganglion 70 per cent, of the total 

 length. 



Anterior fins 19 per cent, of total length, without rays, 

 and reaching ventral ganglion. 



Posterior fins 25 per cent, of total length; with rays 



