G. HEEBERT FOWLER. 



II.— THE COLLECTION OF H.M.S. ' CHALLENGER ' IN ANTARCTIC 

 AND SUBANTARCTIC WATERS. 



Some six years ago Sir John Murray, K.C.B., kindly sent to me" the 

 Chaetognatha collected by H.M.S. ' Challenger ' in 1873-1876. Captured at a date 

 when methods of preservation (especially of plankton) had not been so carefully 

 studied as of later years, and having lain for thirty years in alcohol, the specimens 

 are, naturally enough, by no means in a condition to allow of a general report on the 

 collection. So far, however, as could safely be done, I have attempted to identify 

 the more characteristic species taken in nine hauls at the surface, which lay either 

 in the cruise to the Antarctic or towards the subantarctic Patagonian region. These 

 nine were the only hauls available in what may be termed the critical latitudes. They 

 were studied mainly with the idea of finding approximately the northern limit of 

 K. hamata at the surface, and the southern limit of S. serratodentata, the former 

 being bipolar in the strictest sense, the latter being believed to be tropical, temperate, 

 and subpolar only. They appropriately supplement the collection of the ' Discovery.' 



A considerable number of the specimens were in a hopeless condition ; only those 

 are listed here of the identification of which the writer felt reasonably certain. As to 

 the records of K. hamata and S. serratodentata, there can be practically no doubt, but 

 S. hexaptera is less certain, and S. Zetesios (?) least certain of all. 



The species noticed in these hauls of the ' Challenger ' were the same as those 

 taken by the ' Discovery,' with one addition. 



Sagitta hexaptera, d'Orbigny. 

 Formulae, based on thirteen specimens: — 



