Vol. os And 6.] Crustacea Decapoda of the L. of Tiberias, 243 
LW.S.] 
1905. Atyaephyra desmarestii, Brézek, Sitz-ber. Bohm. Ges. 
iss., Prag, No. i, p. 1. 
1905. Atyaephyra desmarestii, Chaignon, Bull. Soc. Autun, 
XVII, p. 80. 
This little prawn is represented in the collection before us 
by numerous specimens, which do not, so far as one is able to 
judge from published descriptions, differ in any constant 
. Mo 
in length; the largest ovigerous female is only 19 mm. long and 
some are considerably smaller. The formula of the rostral 
teeth varies considerably, the extremes being represented by 
the following figures us. To some extent, however, varia- 
tion in this respect is due to size and therefore, probably, to 
age, for very small individuals always have a small number of 
teeth both above and below. Of the dorsal teeth, from 1 to 4 
are situated on the carapace behind the orbital notch; asa rule, 
only 2 or 3 occur in this position, the number being rather 
lower than that usually found. . 
The size of the eggs is another variable character. In one 
female eyed eggs were 627 » long by 443 ;. in greatest trans- 
verse diameter; in another in which they were in a somewhat 
mo vanced stage of development, the corresponding 
measurements were 596 » and 394 »; in all cases they had a 
very regular oval contour. : 
iving individuals were sometimes hyaline and practically 
colourless, having only a few scattered pigment-cells on the 
ody and appendages; others were so deeply pigmented as to 
be almost black, while yet others had their pigment distributed 
in regular transverse stripes of a blackish colour on the thorax, 
abdomen and limbs. A few were noticed in which the muscles of 
the body had a distinct yellow tinge and were much 
transparent than usual. Although no very small individuals 
were seen which were deeply pigmented, some ovigerous 
a t 
rm Barrois’s statement as to the sexual differences that 
exist in the third and fourth legs of this species. His figures 
agree well with our own observations. : sith - 
Egg-bearing females were not common in October soically 
rendered probable that the breeding season was then praciica®’ 4 
over by the fact that most of the eggs observed were in @ 
