92 DE. G. S. BKADY ON MTODOCOPA OBTAINED 



are possibly to some extent incorrect owing to shrivelling of the specimen when taken 

 out of the spirit. The soft parts of the animal, so far as they can be made out, do not 

 differ materially from those generally belonging to the genus. 



The first three natatory setae of the female antenna are marginally spinous as in 

 Pleoschisma (see figs. 3, 4, PL XVII.); so also is the first seta of the male antenna. The 

 prehensile branch of the male antenna (fig. 19) is irregularly dentated on both margins. 

 Caudal laminae (fig. 20) armed with seven marginal setae, four of which are unguiform 

 and much stouter than the others ; of these ungues the first is very short, the second 

 about twice as long, the third twice as long as the second, and the fourth slightly 

 longer than the third ; three very short, slender, and nearly equal setae are placed in 

 front of the first unguis and in the spaces behind the first and second and second and 

 third ungues. 



Hal. One specimen (a male) of this species was found in a tow-net gathering from a 

 depth of 2-10 fathoms, ofi' Port Jackson, Australia; another (female) from a depth of 

 7 fathoms in Flinders Passage, Australia. 



Genus Pleoschisma, G. S, Brady. 



Pleoschisma moeoides, G. S. Brady. (Plate XVII. figs. 1-11.) 



1888. Pleoschisma moroides, G. S. Brady, "On Ostracoda collected by H. B. Brady, Esq., LL.D., 

 P.R.S., in the South Sea Islands," Trans. Roy. Soc. Edinb. vol. xxxv. p. 514, pi. i. figs. 23, 24. 



" Shell, seen from the side, subcircular, height equal to three-fourths of the length. 

 Anterior extremity wide, feebly rounded, almost flat, notch obsolete ; posterior narrower, 

 rounded, slightly sinuated above and below ; dorsal and ventral margins moderately 

 convex. Seen from above, broadly ovate, nearly equal in width throughout ; extre- 

 mities broad and rounded, the anterior rather the narrower of the two ; lateral margins 

 moderately arcuate ; width equal to four-sevenths of the length. Surface of the shell 

 minutely punctated, and in old specimens raised into circular bosses ; colour dark 

 brown. Length 1*2 mm." 



Antennules, in both sexes, very similar to those of Philomedes : the sensory setiferous 

 seta attached to the antepenultimate joint in the male is dilated at the base, and is 

 setiferous on the outer side only (fig. 1). The antenna of the male is larger than that 

 of the female, and the dilated basal joint is closely and delicately striated (fig. 2) ; the 

 first and third joints of the natatory branch are very long, the relative lengths of the 



nine joints being approximately as follows: 10*4 ij. 322'>'2'l ' *'^® secondary 

 branch is strongly prehensile, its terminal joint curved, its concave margin deeply and 

 irregularly indented, and its apex minutely crenulated (fig. 5); each of these two joints 

 bears a single seta; the much smaller basal joint has four or five small cilia. In the 

 female (fig. 3) the basal joint is not at all striated, and the relative lengths of joints of 



