Cumacea: 11. Diastylidae, 3. Diastylopsis 



113 



than the telson, to which are attached 2 pairs of lateral spines, the upper 

 very small, and a large apical pair. Antenna 1 Q with each flagellum 3- jointed, 

 in the d the principal is 5-jointed. Antenna 2 o showing i large joint 

 followed by a minute one. The peduncle of the uropods in the 9 is as long 

 as the 6^^ pleon segment and as the exopod, rather longer than the endopod, 

 which carries 6, 2, 2 spines respectively on the 3 joints; in the d the 

 peduncle is rather longer, and the endopod has 12, 4, 3 spines on the medial 

 margin, the apical spine being continuous with its 3*^ joint. Colour yellowish 

 white. L. about 8 mm. 



Magellan Strait, Punta Arenas, depth 4 m. 



7. D. thileniusi (Zimmer) 1902 Leptostylis t., Zimmer in: Zool. Jahrb., Syst. 

 4;. 17iii p. 449 tf. ti— W I 1908 L.t., Caiman in: Ann. nat. Hist., ser. 8 v.l p. 239 | 1908 

 Diastylopsis t., Zimmer in: Ergeb. Tiefsee-Exp., v.8 p. 183, 190. 



Pseudorostral lobes bluntly produced in front of the eyelobe, sinus 

 defined by an acute antero-lateral tooth. Carapace little longer than pedigerous 



Fig. 68. 

 D. thileniusi (5) (Zimmer). 



Fig. fi9. 

 D. thileniusi (Zimmer), maxiUiped 3. 



segments combined, fi'ontal lobe with 2 transverse lines, a pair of lateral 

 lines from the middle of its sutures not quite reaching the lower margin of 

 the carapace, and a shorter pair crossing the ends of the sutures. Pedigerous 

 segments 1 — 3 dorsally short, with denticulate front margin, sides of 3*^ 

 almost encircling the very long 4*^, with which it is nearly fused, 4^'^ nearly 

 surrounding the small 5**^, of which the hind corners are little and obtusely 

 extended. Pleon segments with postero-ventral spines and some dorsal setae; 

 telson rather longer than the preceding segment, with 2 pairs of setae on 

 the wide basal section and 6 of lateral spines on the narrowed end. Antenna 1, 

 accessory flagellum very small. Antenna 2, 3- (text) or 4- jointed (fig.). Maxilli- 

 ped 3. 2^^ joint greatly widened distally and on lateral apex strongly pro- 

 duced to an acute point, while the whole distal margin is produced to 

 form a rounded plate covering (from below) nearly all the remaining joints. 

 Peraeopod 2 with 4*^ joint longer than 5*, 3^ and 4*^ pairs with rudi- 

 mentary exopods, 4*^^^ pair with 2""^ joint not especially short. Peduncle of 

 uropods nearly as long as the telson, longer than the endopod, which is 



Das Tierreich. 39. Lief.: T. R. R. Stabbing, Cumacea. 8 



