23 



15 



23 



9 



9 



18 



14 



18—25 



8 



5-6 



H 



13 



23 



7—9 



8 



16 



12 



20 — 30 



7-8 



6-7 



13—14 



I I 



22 — 27 



9 — 10 



5—7 



T 3— 15 



IO 



25 



8-9 



7 



13 



9 



27 



7—9 



5 — 7 



9—14 



8 



23—30 



9 — 10 



5-6 



12 



It is probably a result of the strong contraction that this table is not quite so level as 

 in some species, certain specimens appearing under a shorter total length than they possessed 

 in life. But on taking the contracted specimens to a separate table, I still got no clue by which 

 to sort them into separate species. 



II. Genus Krohnia (Langerhans, 1880). 

 13. Krohnia hamata Moebius. 



K. Moebius. Zoologische Ergebnisse der ('Pommerania') Nordseefahrt : Vermes. Jahresb. 

 d. Comm. z. wissensch. Untersuch. d. deutschen Meere. Jahrgang I. and II., s. 105. 



The characters of this interesting species have been given at length in Biscayan Plankton 

 (p. 74) and need not to be repeated here. There exists a very slight ridge with sense bulbs 

 in the position of the vestibular ridge of Sagitta ; but it is extremely difficult to see, and I 

 had failed to observe it among the Biscayan and Faeroe Channel specimens. Some of the 

 younger specimens exhibited the sagination of the more ventral jaws already described by 

 Strodtmann and the present writer. Formulae : — 



26.0 



27 



1 1 



20 



24.0 



29—33 



1 1 — 1 2 



1 6 — 2 3 



20.0 



25—27 



10 — 1 1 



19 — 2 1 



19.0 



3i 



1 1 



15 



18.0 



27—33 



1 1 



20 



I 7.0 



29 



13 



1 2 — 14 



16.0 



28-34 



8—12 



13—21 



15.0 



25—30 



9— 11 



19 — 2 1 



14-5. 



3 1 



1 1 



18 



14.0 



28—32 



10 — 1 2 



1 7 — 20 



13.0 



26—30 



1 1 — i 2 



1 7 — 22 



12.0 



25—33 



10 



16 — 19 



1 1 .0 



22 — 27 



10 — 1 1 



11 — 13 



10.5 



28 



10 



16 — 1 7 



10. 



30 



10 — 1 1 



17 



8-5 



30 



10 



9 



8.0 



25—31 



9 



1 2 



