CRUSTACEA CASl'IA. 203 



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te 



The 2 anterior pairs of uropoda strongly s])iuous; last pair with the outer 

 ramus somewhat longer than the basal ])art, its proximal joint liaviug on 

 either side a singlf fascicle of spines. Telson nearly semicircular in outline, 

 cleft very narrow, eacli half armed with a lateral and an apical spine, the 

 hatter accompanied by a number of delicate bristles. Length of adult female 

 13 mm., of male 15 mm. 



Bcmaiks. — The present species, established by Dr. Grimm, may be 

 regai-ded as the type of the genus AmailiiUina. It is chiefly distinguished 

 by the number of tlie dorsal projections, and particularly by the peculiar, 

 gibbous form of the last one, moreover by the shape of the basal joint of 

 the last 2 pairs of pereiopoda. 



DescripHon of (he female. 



(PI. V). 



The length of fully adult ovigerous specimens amounts to about 1 3 mm. 



The body (see figs. 1 and 2) is on the whole of a rather stout and com- 

 pact form, being generally strongly curved. Its integuments are, however, 

 not nearly so strongly incrusted as in the species of the 2 preceding genera, 

 and do not exhibit any conspicuous sculpturing. In a dorsal view of the 

 animal (fig. 2), the body appears much less comi)ressed than in the species 

 of the genus Gmelina, exliibiting a somewhat subfusiform sha])e, the greatest 

 breadth (across the 4th segment of mesosome) equalling about % of the length. 

 The back is keeled throughout tlie whole mesosome and metasome; but the 

 keel is in the anterior part rather low, becoming gradually more conspicuous 

 posteriorly, where it is elevated in each segment to a lamellar, posteriorly 

 pointing projecti(m. 1'he exact number of these dorsal projections is not 

 easy to indicate, as they only little b}-. little grow out from the segments. 

 But in tlie 2 anterior segments of the mesosome there is never found any 

 trace of such ])rqjections, and in the 3rd segment only in some specimens a 

 slight attempt to a projection is observed. Not rarely even the dorsal projec- 

 tions are not at all distinctly formed in front of the 5th segment, that of the 

 latter segment being in such cases rather small. In the last 2 segments of 

 mesosome and those of metasome they, however, always appear well formed. 

 The projection of the last segment of the metasome in all specimens dis- 

 tinguislies itself very markedly by its peculiar form, it being not. as in 

 the preceding segments, triangular, but broadly rounded at the tip, giving 

 that segment, in a lateral view of the animal, a somewhat gibbous appear- 

 ance. The urosome is comparatively short and massive, without any dorsal 

 keel or projections, but each of the segments carries dorsally a few simple 



$n3.-MaT. cTp. 203. 25 



