15 



Anterior fins short, rounded, about midway betvveen the tail septum and the ganglion. 

 Posterior fins longer and rather broader than the anterior, somewhat triangular, about equally 

 on trunk and tail; their widest point at or behind the septum; they do not reach to the 

 vesiculae seminales. Tail fin truncate. 



Jaws broad, strongly curved ; the concave edge of the younger jaws exhibits a crest 

 foliowed by a bay, just below the tip (compare Krumbach, op. cit.). Teeth long and slender, 

 springing from a broad base. 



Vestibular ridge (?) not terminating in an external process; carrying a few strong papillae, 

 of which in older specimens a doublé row may be present. Corona ciliata extending from in 

 front of the eyes to a short distance on the trunk, sometimes slightly sinuous. 



Two specimens from deep hauls with the \'ertical net showed the same swelling up of 

 the epidermis as was figured iox furcata in Biscayan Plankton (op. cit., fig. lo). I have noticed 

 it in one or two other species. It is not unlikel)- that Conant's Spadel/a inaxiina was founded 

 on specimens of this kind. which occurred also in the Biscayan and Faeroe Channel collections. 



5. Sagitta uiacroccphala P'owler. 



G. H. FüWLER. Biscayan Plankton. Part III, the Chaetognatha. Transactions of the Linnean 

 Society of Londen, 2nd Series, Zoology, Vol. X, p. 65. 



This very unmistakeable species was represented by five specimens only. lts characters 

 have been described in the Biscayan Report, and need not be repeated here. The specimens 

 were all in poor condition. 



6. Sagitta ncglecia Aida. 



T. Aida. Op. cit., p. 16. 

 ? Sagitta bipunctata Béraneck. 

 Ed. Béraneck. Op. cit., p. 153. 



Characters. Head small. Body slender, resembling bipunctata-^ firm, not fiaccid; the 

 middle third nearl)- of the same thickness throughout, tapering slightly towards head and tail. 

 There is no marked neck, owing to a long narrow thickening of the epidermis to form a 

 coUarette. Longitudinal muscles broad and stout. Tail 26 to 40 per cent. of the total length. 



Anterior fins commencing at the posterior end of the ventral ganglion, broadest towards 

 their posterior end. Posterior fins rather longer, separated only by a small interval from the 

 anterior; rather more on the tail than on the trunk, widest behind the septum, reaching to the 

 vesiculae seminales. Tail fin truncate, reaching to the vesiculae seminales when tumid. 



