486 Chas. W. Hargitt 



J. V. Carus^ records the following species: — P. repens^ seas 

 of Great Britaia, giving Pieper's records as to its occurreiice in the 

 Adriatic. P. linearis^ Distribution similar to o-epetis. Habitat, Bay of 

 Naples, Du Plessis. P. serpens^ shores of Great Britain. Habitat, 

 »Sea of Tuscanycf, Richiardi. 



An examination of the extensive and painstaking reports on 

 the » Hydromedusae of Australia« by K. von Lendenfeld 2, while 

 showing a comparatively rieh Hydroid fauna, affords no record of 

 the occurrence of Perigonimus. 



In a report on a North-polar Expedition, by E. von Marenzeller^ 

 there occur but few records of Hydroid life. Only 4 genera vt^ith 

 5 species v\rere collected, and Perigonimus does not appear among 

 them. 



F. E. Schulze* reported P. repens as found in Firth of Forth 

 at a depth of 25 fathoms, and in Terschelling at 20 fathoms. Dis- 

 tribution »Vor der Ostküste von Schottland und England«. 



It will be Seen from these records that the larger proportion of 

 species have been reported from the environs of the British Isles 

 and North sea. This may be due in part to the greater attention 

 which has been given to this aspect of zoology by English natura- 

 lists, but it can not be wholly due to this. It would seem that 

 these regions afford a more congenial habitat than some others. 



In some cases it would seem that the ränge of a given species 

 is considerable. For example, P. linearis has been reported from the 

 coast of Northumberland and from the Gulf of Naples. I have iutimated 

 above, however, that there seems to be some doubt as to the distinct- 

 ness of the Naples species, With this exception it would seem that the 

 ränge of a given species is usually limited. But at the same time it 

 appears that the ränge of the genus is rather wide, being found 

 on both shores of the Atlantic and in the Mediterranean, yet less so 

 than many others of the family. 



Another fact is worthy of attention and that is that no reports 

 of the genus occur from distinctively pelagic regions. I find no 

 account of it in the Challenger Reports upon the Hydroidea, nor in 

 the Reports of the Hydroidea of the Gulf Stream, nor in Agassiz' 



1 Prodromus Faunae Medit. 1885 Vol. 1 pag. 4. 



2 Proc. Linn. Soc. New South Wales Vol. 9 pag. 206, 345, 401, 467, 581. 



3 Denkschr. Akad. Wien Math. Nat. CI. 35. Bd. 1877. 



" Ber. CoQim. Wiss. Unters. D. Meere Kiel 2./3. Jahrg. 1875 pag. 127, 



