180 DR. G. S. BRADY ON NEW OR 



The secondary branch of the antenna (fig. 10) is long and slender, and bears a 

 strongly falcate terminal unguis, which towards its tapering extremity has a sigmoid 

 twist, and at its base a single stout seta : in some cases, though not always, its outer 

 margin is rather coarsely creuulated ; the penultimate joint (dactylon) is elongated 

 and bears three short setae on the distal portion of its inner margin ; the second joint 

 of tlic mandibular foot (fig. 11) bears a short digitiform process in addition to the 

 usual sette, but there is no toothed process on the basal joint. Claws of the post- 

 abdominal lamina3 (fig. 12) five to eight, varying in number with the age of the 

 specimen ; margins devoid of spines or pectinations. 



Female. Several of the terminal setae of the antennules (fig. 9) are divided apically 

 into lashes of fine filaments, and the concave margins of the postabdominal ungues 

 (fi<». 13) bear a few minute spines, the intervals between which are very finely 

 pectinated. Shell shorter and broader than that of the male (fig. 8), greatest height 

 situated behind the middle and equal to more than two-thirds of its length ; anterior 

 margin narrowly, posterior very broadly rounded ; dorsal margin forming a flattened 

 arch, ventral boldly arcuate. Eye-spot much smaller than in the mule and paler in 

 colour. Length 1 mm. 



Hab. Taken in the surface-net at Trincomalee, Ceylon, plentifully; also at Cruz Bay. 

 These gatherings consisted, with one or two exceptions, entirely of males. 



Among a considerable number of specimens one female only could be found, and 

 this occurred with only one or two males in the collection from Cruz Bay. I figure 

 here in outline an example of both sexes from this locality. I think there can be little 

 doubt as to its belonging to the female of this species, although there is a distinct 

 pectinated armature of the postabdominal ungues which is not visible in the male. 

 I have, however, already noticed ^ in a very closely allied species {A. quadrata) that the 

 ])ectmation of these ungues is more pronounced in the female than in the opposite sex. 

 The Trincomalee specimens show a considerable diversity in the number of ungues, 

 which, I think, may be accounted for by the diff'erences of age. 



AsTEROPE LiciiEXOiDES, sp. nov. (Plate XXIII. figs. 22-24.) 



Shell of the viale subquadrangular as seen from the side (fig. 22), about twice as 

 long as broad ; anterior extremity irregular, wide and obliquely truncated, the antennal 

 notch forming a laige and deep gap below the middle ; posterior extremity rectangularly 

 truncate, with a large rounded median prominence ; dorsal margin gently convex, with 

 a slight sinuation in front of the posterior angle, ventral very gently arcuate, with a 

 slight posterior sinus : seen from above the outline is elongated, quadrate, wider in front 

 than behind, all the angles very well marked, greatest width equal to half the length 



' " On new or imperfectlj' known Species of Osfcracoda, chiefly from Xew Zealand," Trans. Zool. Soc. 

 London, vol. xiv. pt. viii. p. 432 (December 189y). 



