206 "TERRA NOVA" EXPEDITION. 



Remarks. — Compared with C. intermedia this species has larger eyes with black 

 pigment, relatively shorter antennae, measuring in these specimens 8 mm. as compared 

 with 1 1 mm. in C. intermedia of the same size, very short and blunt penial filaments, 

 and an appendix masculina on the second pleopods of the male, which is not very 

 much curved and has an obtuse or club-shaped apex. 



13. Cirolana jyellucida, n. sp. PI. II, figs. 4-10. 



Occurrence. — Stations 86, 129 and 130 (types), off Three Kings Islands, plankton, 

 from the surface and 3 metres, about two hundred specimens. 



Station 133, Spirits Bay, near North Cape, New Zealand, plankton, at 20 metres, 

 one specimen. 



Descrijjtion. — Body robust in general form and considerably vaulted ; integument 

 soft and only very slightly calcareous, semi-transparent and without pigment or 

 chromatophores. 



Eyes a beautiful golden brown colour in specimens preserved in formaline ; in 

 spirit the colour disappears and the eyes appear colourless ; seen from the side, slightly 

 longer than deep, with the upper margin practically straight. 



Frontal plate about four times as long as broad, its front end not visible from 

 above ; clypeus without anterior process ; the whole form and structure of the frontal 

 plate, clypeus and labrum is very similar to that of C. horealis and the other species 

 belonging to Hansen's " Sectio prima " of the genus. 



Antennules (pi. II, fig. 5) shorter than the peduncle of the antennae, robust; 

 flagellum composed of ten to twelve short joints furnished with numerous sensory hairs. 



Antennae (pi. II, fig. 6) reaching just beyond the posterior margin of the second 

 free thoracic somite ; second joint of the peduncle very short, third joint longer than 

 fourth, fifth one and three-quarters the length of the fourth ; flagellum composed of 

 22-24 joints. 



Coxal plates of the thoracic somites shaped and furrowed almost exactly as in 

 C. neglecta, Hansen ; seventh coxal plate shorter than the sixth, with its oblique furrow 

 extending to the posterior margin. 



Last thoracic legs (pi. II, fig. 8) with the second joint flattened and expanded, 

 about twice as long as broad, with a conspicuous ridge on its lower side ; the outer 

 lateral margin and the distal portion of the inner margin closely set with long plumose 

 setae ; the proximal portion of the inner margin with a few short simple setae ; the 

 longitudinal ridge on the lower side furnished with setae, which are shorter than on the 

 outer margin and not so closely set nor so numerous as in C. neglecta, to which this 

 species is most closely allied ; fourth joint shorter than the fifth and much shorter than 

 the sixth. 



Last abdominal somite (pi. II, fig. 9) triangular, wider than long, its apex very 

 obtuse and evenly rounded, not angular ; armed with six pairs of spinules on the distal 

 third of its margins. 



