Of this species, founded by Yerrill in 1873, figured by the same author under the 

 name of gracilis in 1885, the following characters have been extracted from his description 

 and figure, and Conant's description : — Head small, not much broader than the body at its 

 broadest; neck not sharply marked. Body slender, thickest in the middle, tapering slightly 

 towards both ends. Tail segment 20 per cent of the total length. 



Anterior fins short, narrow, elliptical, rather far forward. Posterior fins separated from 

 the anterior by a long gap rather less than their length; about equal in length to the anterior 

 [but drawn much longer], elliptical, not reaching to the vesiculae seminales when the latter 

 project only slightly, about equally distributed on trunk and tail [in the figure; but the oviducal 

 papillae at the tail septum are stated in the text to be at about the posterior third of the 

 fins, which would leave two thirds on the trunk]; widest at the plane of the septum. Tail fin 

 broadly rounded. 



Jaws considerably curved, with acute tips. Corona ciliata elongated, sinuous, oval. Formula 

 25—30 20 8—12 5—7 12—15. 



The possibility that this may perhaps = arctica Aurivillius, and its practical identity 

 with what little we know of falcidens Leidy, have been already mentioned. At any rate the 

 latter has not been so fully described as to merit a place among valid species. 



Sagitta hispida Conant (non Aida). 



F. S. CONANT. Description of two new Chaetognaths. Johns Hopkins University Circulars. 

 Vol. XIV, p. jj. 



The following characters have been deduced from Conant's text and figure. Length 

 j — ji mm. Head small, with no perceptible neck in contraction. [From the outline of the 

 animal we may fairly presume the presence of a collarette]. Trunk of nearly the same thickness 

 throughout its length, but tapering slightly forwards. 



Anterior fins rounded, not reaching the abdominal ganglion ; widest a little before their 

 posterior end, narrowing rapidly forwards. Posterior fins long, rounded, much more on the tail 

 than on the trunk, widest well behind the septum; much longer and rather broader than the 

 anterior fins. Tail fin rounded. 



Formula 7— 11 : 33 : 8 — 9 : 4—5 = 8—15. 



Corona ciliata long and sinuous, extending from in front of the eyes to near [? how near] 

 the abdominal ganglion. 



Unfortunately Conant's figure cannot be trusted implicitly: he described the corona as 

 reaching "almost to the level of the abdominal ganglion", and the anterior fins as extending 

 "from near the level of the abdominal ganglion"; but in the drawing he leaves no less than 

 14 per cent of the total length between corona and fins, which shows an error somewhere. 



So far as the description goes, it is indistinguishable from Mediterranean specimens of 

 bipunctata, but the entire absence of a neck in the figure, removes this possibility. So far as 

 description and figure go, there is nothing to separate it from neglecta except the extension 



