Cumacea: 11. Diastylidae, 1. Diastylis 



105 



the 1^* than both together; in non-ovigerous females the endopod 2-iointed 

 (Caiman). Colour whitish. L. o 10 mm, d 11 mm. 



N. Nonvay, Faro Channel, Shetland Isles, off Galway, Ireland; depths between 

 183 and 1006 m. 



28. D. tricinctus (Zinimer) 1903 Leptostylis (ricindn, Zimmer in: Zool. 

 Jahrb., Syst. v. 18 p. 691 tf. CC— EE | 1908 Diastylis t., Zimmer in: Ergeb. Tiefsee- 

 Exp., V. 8 p. 183. 



Pseudorostral lobes not strongly produced, liorizontal, antero-lateral 

 corners obsolete. Carapace narrow, encircled by 3 finely denticulate pleats, 

 the foremost curving round the frontal lobe to the rear, the second nearer 

 to the 3<i than the 1^^ Pedigerous segment 5 with postero-lateral angles 

 very acutely produced and each surmounted by a row of plumose setae. 

 Pleon segments 1—4 with circle of postero-ventral spines; telson rather longer 

 than 5**^ pleon segment, about 2/3*^^ of peduncle of uropods, with 8 pairs of 

 lateral spines and a longer apical pair. Antenna 2, flagellum moderately 

 long. Exopod of uropods slightly shorter than the telson, endopod about half 

 as long as the peduncle, with 7, 6, 13 spines on medial margin of its joints 

 respectively, those on the 3<^ joint small, P* joint rather longer than 3*^ 

 3*1 than 2"^. Colour clear brown. L. cf about 6 mm, 9 unknown. 



Shinagawa (Japan). 



Fig. 59. 

 D. tricinctus (cJ) (Zimmer). 



Fig. 60. 



D. nucella (?) Caiman, 



carapace and pedigerous 



segments. 



29. D. nucella Calm. 1912 D. «., Caiman in: P. U. S. 31us., vAl p. 605, 645 

 tf. 62—65. 



Pseudorostral lobes short, horizontal, antero-lateral corners almost obso- 

 lete. Carapace with height, width, and length subequal, eyelolie wanting, 

 surface granular, dorsally diversified with 3 longitudinal pairs of series of 

 minute square-cut teeth, lower margin in front similarly serrate. Pedigerous 

 segment 5 with postero-lateral corners obtuse. Telson scarcely longer than 

 the preceding segment, half as long as the peduncle of the uropods, with 

 lateral spinules variable, not exceeding 3 on either side, the apical pair longer. 

 Antenna J, 3^^ joint longer than 1*^ or 2"'^. Antenna 2, penultimate joint 



