TANAIDACEA AND ISOPODA— TATTERSALL. 219 



type. In the young male the uropods just reach the apex of the telson. The scythe - 

 like curved outer uropods are characteristic of all stages of growth of this species, and 

 essentially of the same type throughout, though larger and more emphasised in the 

 adult male. 



The figures (pi. V, figs. 12-15) of the antennules and antennae, the second and 

 eighth thoracic limbs and epistome will convey a sufficient idea of the character of these 

 appendages in this species. The stylet in the second pleopods of the male (pi. V, fig. 16) 

 is long and sharply pointed, nearly twice as long as the inner ramus. The epistome 

 (pi. V, fig. 17) is constricted somewhat at, the centre, and has the anterior margin 

 convex. It projects slightly beyond the head, and is visible in dorsal view. The 

 upper lip is triangular, with the distal margin convex. Length of an adult male, 8 mm. ; 

 of an adult female, 7 mm. ; and of a young male, 6 • 5 mm. 



Three species of Isocladus are known : /. tristensis, Leach, /. integer, Heller, and the 

 present species. /. armatus may be distinguished from the other two by the shape of 

 the outer ramus of the uropods, and by the form of the upper lip and epistome. 



Genus OYMODOCE, Leach. 

 27. Cymodoce hodgsoni, n. sp. PL VI, figs. 1-8. 



Occurrence. — Station 96, 7 miles East of North Cape, New Zealand, 70 fathoms, 

 bottom fauna, one male, 9 mm. 



Description. — Body (pi. VI, fig. 1) about twice as long as broad and capable of 

 being partially rolled up into a ball, more or less covered, but not closely, with short 

 fine setae. On the thoracic segments these setae occupy a band running across the 

 posterior half of each segment, and though nearly all worn ofl", the pits from which 

 they arise are clearly to be seen. The hairs are much more numerous on the abdomen, 

 and more evenly and regularly distributed. They are rubbed off" dorsally but still 

 remain laterally. 



Head somewhat highly vaulted, anterior margin produced between the bases of the 

 first antennae into a short spatulate rostral process, in front of which projects the blunt 

 epistome. The latter is a conspicuous object in dorsal view even when the animal is 

 not fully straightened out, as in the figure here given (pi. VI, fig. 1). On each side of 

 the head, slightly in front of and below the eye, there is a broad groove, the margins of 

 which are strengthened by a ridge, into which the anterior forwardly directed part of 

 the coxal plate of the first free thoracic somite slides when the creature rolls itself up 

 into a ball. 



Thorax with the first free somite much the largest, and the remainder more or less 

 sub-equal. The form of the coxal plates is shown in pi. VI, fig. 2. The last four 

 somites of the thorax have four obscure tubercles each, those nearest the median line 

 being more clearly defined. 



Abdomen (pi. VI, fig. 1) with a proximal segmented portion and a terminal 



