GLYPHOCRANGON ALATA. 137 
Famity GLYPHOCRANGONID&. 
GLYPHOCRANGON A. M. Epw. 
Ann. Sci. Nat., Zool., 6¢™¢ Sér., Vol. XI., No. 4, p. 3, 1881. 
Glyphocrangon alata Fax. 
Plate XX XVII. 
Bull. Mus. Comp. Zool., XXIV. 201, 1893. 
The rostrum is armed with a pair of lateral spines on a level with the 
+ anterior end of the eye ; posterior to this pair of spines follows a variable 
number of smaller marginal spines (three to five on each side). The anterior 
half of the rostrum is unarmed, although the margins are ciliated. A light 
spinulose carina runs along the median line of the rostrum from the base to 
the anterior third (in some specimens this carina is obsolete). On each side 
of the median line there are, on the basal portion of the rostrum, four or 
five small spinules. 
The carapace and abdomen are thickly tuberculated. On the antero- 
lateral regions of the carapace and on the abdominal pleure the tubercles 
assume a spiny character. For the rest, the tubercles are for the most 
part laterally compressed, their tops truncated and more or less eroded. It 
is further to be observed of these tubercles that they are arranged in longi- 
tudinal rows, and six of these rows on each side of the carapace by their 
greater prominence form imperfect carine corresponding in position to those 
commonly found in species of this genus. The external orbital spine is 
directed upward at an angle of 45°, is curved (with the concavity inward), 
but hardly deflected outward. The spe at the antero-lateral angle of the 
carapace is turned somewhat downward and outward. Between these two 
spines and just behind them is a strong spinous tooth, acute at the end, and 
vertically compressed, its base broadening out in such a fashion that the whole 
tooth forms an acute-tipped wing-like expansion. This is, in fact, the greatly 
developed anterior portion of the fourth carina (counting from the median 
line). Behind it the carina continues on, as a low toothed ridge, to the 
cervical groove. The broad triangular area between this carinal tooth and 
the gastric region is thickly beset with laterally compressed spinous tuber- 
cles like those which adorn the other parts of the carapace. 
An interrupted median dorsal carina runs along the abdomen, Upon the 
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