CRUSTACEA FROM THE. CANARY ISLANDS. 131 
mere variety. In the figure of A. gibbosus in the ‘“ British 
Sessile-Eyed Crustacea” the position of the gnathopods 
is inverted. 
ISOPODA. 
The only representative of this order is a single small 
specimen of Eurydice pulchra (Leach), one of the com- 
monest crustacea throughout our own district. 
SCHIZOPODA. 
Of this order I find only two species (except the larval 
forms mentioned above), which are :— 
1. Siriella crassipes (Sars, Middelhavet’s Mysider Arch. 
for Math. and Naturvidensk, Christiania, 1877). 
Of this species there are a considerable number of 
specimens, ranging in size from 3 mm. to 7mm. in length. 
This last is less than half the length of Sars’s male 
specimens taken at Goletta, and I therefore suspect that 
none of them are full grown. I am confirmed in this view 
by the fact that the number of spines on the outer margin 
of the outer branch of the uropods ranges from two in 
the smaller to ten in the larger specimens, while Sars’s 
adult specimens had fifteen. The most obvious distinction 
between this and the allied S. clawsii (Sars) is in the tip of 
the telson. Between the two large apical spines with 
which this is furnished in both species there are three very 
small spines. In S. clausii these are of equal length, while 
in S. crassipes the central spine is at least twice as long as 
the side spines. In my specimen these lateral spines are 
so small that they can only be discerned with a 4-in. 
objective. S. crassipes has so far only been taken in the 
Mediterranean. 
