NOTES ON JASSA FALCATA (Mont.). 69 
name is sanctioned by long usage, as in the case of many 
other doubtful species. In this question I have the 
support of Canon Norman’s high authority and can 
only express my regret that I cannot conform with that 
invaluable work, the Gammaridea of Das Tierreich. 
The presence in the gathering of a colony of Jassa 
falcata in every stage of development, and taken from 
so small an area that the co-existence of a nearly allied 
species of the same genus is scarcely possible, invites a 
somewhat ‘‘ intensive ’’ study of this species. It is true 
that this was done by O. Nebeski* in 1880 on specimens 
obtained in Trieste harbour, but as his drawings of the 
b) 
2nd gnathopods are only in outline, and as he does not 
appear to have met with the small forms of the ovigerous 
female and apparently sexually mature male, it seems 
worth while to carry on his investigations with the 
additional forms now available, and with the assistance 
of photographs of the 2nd gnathopods kindly executed 
under Professor Herdman’s directions. 
Taking the gnathopods in the order of development, 
we have (see Plate, figs. A to H):— 
A. Young. Very numerous, constituting the bulk 
of the gathering, and ranging in size from freshly 
hatched individuals to 7 mm. The 2nd gnathopod in 
one 2 mm. long had the palm less concave than the 
figure, taken from one 7 mm. long. There is 
considerable variation in the relative size, but very little 
in the shape of the hand. It will be noticed that those 
figured are larger than those of the small ovigerous 
female (B). This is Nebeski’s, Pl. IV, fig. 44, f. 1. 
B. Small females with ova. Six specimens, 6 to 
7mm. The specimen whose gnathopods are figured had 
many well-formed ova. These gnathopods have not yet 
* Arbeit. Inst. Wien, Vol. 3, p. 151, Pl. XIII (iv), fig. 44. 
