BY MARGUERITE HENRY. 



49 



abdomen truncated at the tip, marginal denticles very small and hair-like; end- 

 claws each with a very minute basal spine. Lengtii .35 mm. 



This species is regarded by some authors as identical with Alonella .excisa 

 (Fischer), and Delachaus (1918) classed it as A. excisa var. clathraiula on the 

 grounds that the only difference was the presence or absence of the posterior ex- 

 cision. There are, however, other difterences, the carapace of clathraiula is longer 

 in proportion to its breadth, and the markings of the carapace differ in the two 

 species; in clathratula there is only one minute basal spine, while in excisa there 

 are two spines of unequal length. 



Distribution. — N.S.W. : Maroubra, Kendall, Lett River. South America, 

 South Africa. 



Alonella ddoodonta, n.sp. (Text-flgs. 1-4). 



Female. Carapace, seen laterally, truncated oval in outline; dorsal margin 

 evenly arched, ventral slightly curved, posterior edges straight. Infero-posteal 

 corner armed with two strong teeth. Head somewhat depressed, ending in an 

 obtuse rostrum. Eye of moderate size, ocellus slightly smaller, situated closer to 



Text-fig. 1. Alonella duoodonta. (x 111) 

 Text-fig. 3. Infero-posteal corner, (x 300) 



Lip-plate, (x 300). 

 Post-abdomen, (x 395). 



the eye than to the tip of the rostrum. Antennules not nearly reaching the tip 

 of the rostrum. Lip-plate large, its anterior and posterior edges almost parallel, 

 its ventral margin with one deep notch followed by irregular crenulations. Sur- 

 face of the carapace marked by a conspicuous reticulation; ventral edges fringed 

 with bristles. Fbst-abdomen strongly built, supra-anal angle distinct; anal den- 

 ticles arranged in an irregular manner, about six stout marginal denticles above 

 which are scattered 5-7 lateral denticles and also some fine spines ; end-claws long, 

 bearing a series of spinules and one basal spine. Colour pale yellow. Length 

 .35 mm. 



I>isfr*M«io«..~N.S.W. : Manly. 



