IMPEKFECTLT-KNOWN SPECIES OF OSTRACODA. 431 



Norman^ A. M. (i). — Last Eeport on Dredgiug among the Shetland Isles. (British Association 



Reports.) 1868. 

 Philippi, a. (i). — Zoologische Bemerkungen in Arch. Naturg. 6 Jahrg. 1840. 

 Saks, G. O. (i). — Nye Bidrag til Kundskaben om Middelhavets Invertebratfauna. (Archiv for 



Mathematik og Naturvidenskab.) 1887. 

 „ (2). — On some Freshwater Ostracoda and Copepoda raised from dried Australian Mud. 



(Christiania Videnskabs-Selskabs Forhandlinger, no. 8.) 1889. 

 Thomson, G. M. (i). — On the New Zealand Entomostraca. (Transactions of the New Zealand 



Institute, vol. xi.) 1878. 



Genus Asterope Philippi. 



Asterope Philippi (i), 1840; G. O. Sars (i), p. 1 1 ; Brady & Norman d), p. 629. 

 Cylindroleberis Brady (i), p. 465; G. W. Miiller (i);,p. 216. 

 Cypridina Auctorum. 



AsTEKOPE AUSTRALis Biady. (Plate XLIII. figs. 1-8.) 

 Asterope austmlis Brady (4), p. 515, pi. iv. figs. 1, 2. 



Shell of the male, seen from the side (fig. 1), ovate, height equal to more than half 

 the length, anterior extremity evenly rounded, with a short, wide beak and a rather 

 wide but shallow antennal notch ; posterior extremity evenly rounded ; dorsal margin 

 very slightly but evenly arcuate, ventral almost straight. Seen from above (fig. 2), the 

 outline is elongate-ovate, widest in the middle, much more than twice as long as 

 broad ; extremities broadly rounded, lateral margins gently and evenly curved. Surface 

 of the shell smooth, destitute of hairs or sculpture, excepting at the posterior extremity, 

 which bears two tufts of very fine hairs. Secondary branch of the antenna (fig. 5) with 

 a large and very crooked terminal unguis, which bears near its base a very long and 

 stout seta, the last joint (dactylon) having- two much shorter setae. Post-abdomen 

 (fig. 8) armed, on each lamina, Avith a series of seven ungues, which progressively 

 increase in size and amount of curvature from the first to the last, the larger of the 

 series very finely ciliated on the concave margin. Length of the shell 1'6 mm. Colour 

 (of spirit-specimens) yellowish white ; the black eye-spot very conspicuous. 



The shell of the female (figs. 3, 4) is somewhat smaller than that of the male, and 

 seen laterally is higher behind than in front ; seen from above it is subacuminate in 

 front and narrowly rounded behind ; the posterior extremity has no setose tufts. The 

 secondary branch of the antenna consists of a simple cylindrical one-jointed stem, 

 which ends in a single long seta (fig. 6). Length 1-4 mm. 



Hab. Males, taken abundantly in the surface-net, Otago Harbour; a single female 

 specimen in a dredging from Akaroa Harbour, depth 6 fathoms, and Lyttelton Harbour, 

 1-5 fathoms. The Otago gathering consisted almost entirely of males, the lesser 

 swimming-power of the females doubtless keeping most of them at or near the bottom. 

 The shell in most specimens is flexible and submembranaceous, but occasionally hard 



3l2 



