120 =S&. I, Smith on new Crustacea from N. America. 
tion which is covered to the lateral margin with low squamiform 
tubercles ; depression between the median and lateral crests 
broad and deep, smooth or slightly punctate, with a median 
line of four depressed tubercles ; lateral margin broken by a 
deep fissure at the cervical suture, and by a slight one a little 
more posteriorly, Antipenultimate segment of the antennex 
as broad as long; anterior angle not prominent ; outer margin 
arcuate, bidentate ; anterior margin armed with several denti- 
cles ; median carina prominent but smooth and even ; terminal 
segment short, the extremity almost truncate and rather deeply 
five-lobed, the lobes rounded; the inner margin bidentate. 
Exposed portions of the abdominal segments sculptured as if 
covered with rows of scales ; fourth segment with a prominent 
median elevation above. Feet nearly naked; the merus seg- 
Several specimens from Egmont Key, west coast of Florida, 
collected by Col. E. Jewett and William T. Coons. It is spe- 
cially interesting as the representative of a genus hitherto 
known only from the old world. 
Aitthra scutata, sp. nov. 
Carapax transversely and regularly elliptical ; margins thin, 
slightly dentate, the denticles separated by broad and very 
shallow sinuses ; posterior margin nearly straight in the mid- 
into dentate crests ; outer and inferior surface of the qd 
oarsely granulous. Ambulatory legs short; the angles pro- 
coars 
jecting into thin, dentate crests. Sternum and abdomen deeply 
Mage: ence Length of carapax, 1:39 in. ; breadth, 2-23. 
carapax. 
The genus 4thra should evidently be placed near Crypto 
