SOLENOCERA AGASSIZII. 183 
The branchial formula is as follows : — 
Somites Vitis VWaune ioe Se Sa Segue Xabhiy Sane 
Pleurobranchie 0 1 1 1 1 1 i io 7 
Arthrobranchie 0 1 2 2 2 2 1 0= 10 
Podobranchiz 0 i 0 0 0 0 0 Oo= 1 
Epipods 1 1 1 1 il il 0 0— (6) 
18 + (6) 
The gill on the eighth somite entered as a pleurobranchia in the above 
table has been considered an arthrobranchia by some recent authors, but 
from its relative position it would seem to be the equivalent of the pleuro- 
branchix of the following somites. The epipods consist of a horizontal stem 
directed backward from the basal segment of the limb, and a vertical forked 
blade which lies between the gills. 
Length, 93 mm.; carapace, exclusive of the rostrum, 29.5 mm. 
Station 3371. 770 fathoms. 1 male. 
SOLENOCERA Lucas. 
Ann. de la Soc. Entomol. de France, 2d Sér., VIII. 219, 1850. 
Solenocera agassizii Fax. 
Plate XL VII, Fig. 2-2. 
Bull. Mus. Comp. Zodl., XXIV. 211, 18938. 
Closely related to S. siphonocera (Philippi), but differing from the latter 
in having the antennular flagella much shorter and subequal, and more 
teeth on the upper margin of the rostrum and gastric region. Comparison of 
a specimen with one of S. siphonocera of equal size (57 mm. long) from the 
Bay of Naples shows that in S. agassizi the antennular flagella are only 
four fifths the length of the carapace, and that there are eight teeth on the 
rostrum and gastric region, while in S. stphonocera the antennular flagella 
are as long as the distance from the tip of the rostrum to the middle of 
the third abdominal segment, — or once and two fifths the length of the 
carapace, — and there are but six teeth on the rostrum and gastric region. 
Moreover, not only is the upper flagellum broader (1 mm.) and blunter in 
S. agassizii than it it is in 8. siphonocera (where it is only } mm. in breadth), 
but also subequal in breadth to the lower flagellum, whereas in the Mediter- 
ranean species the upper flagellum is conspicuously narrower than the lower 
one. 
