CRYPTOLITHODES ALTA-FISSURA. 273 
This species may readily be detected from the 
two previously known by the smoothness of the 
carapace, propodi, and: pleon, and more distinctly 
by the deep orbital notch on each side of the 
rostrum. 
The carapace is nearly as broad again as long, 
and produced considerably, posteriorly to the 
cardiac elevation, a feature that appears to belong 
to the female. 
The rostrum is broad, flat, and rectangular. 
The antero-lateral margins are produced so far 
anteriorly as to be nearly in a line with the 
extremity of the rostrum ; a deep notch, in which 
the eyes are situated, exists on each side of the 
rostrum. The anterior margin is slightly marked 
with distant small points; the posterior margin 
is quite smooth and even. The dorsal surface is 
quite smooth, and pencilled in light red upon a 
yellowish ground, the red pencilling being fine 
and delicate, following the contour of the margin 
and surface of the carapace. 
The pleon is subsymmetrical and very smooth, 
and planted considerably within the posterior 
margin of the carapace. The second segment 
(first visible) has the marginal plates fused with 
the central. The sixth segment is without 
lateral plates; and the telson is situated beneath 
VOL. IL. T 
