126 



Cumacea: 11. Diastylidae, 7. Leptostylis 



4*^^ pairs minute. 2-jointed. Peduncle of uropods rather more than twice 

 as long as the telson and a little longer than the endopod, with 7 or 

 8 spines on the medial margin; endopod wdth P*^ joint longer than 2^^, equal 

 to 3^ spines on medial margin respectively 2, 1, 1; exopod shorter than 

 endopod, but reaching beyond its 2"^^ joint. L. 9 4-5 mm. 



Off S. coast of Nova Zembla, depth 90 m. 



7. L. maerurus O. Sars 1869 L. viacrura, G. 0. Sars in : Nyt Mag. Naturv., 

 V. 16 p. 344 I 1870 L. m., G. 0. Sars in: Forh. Selsk. Christian., 1869 p. 156 | 1886 L. m., 

 Gr. 0. Sars in: Norske Nordhavs-Exp., t;. 6 nr. 15 p. 24 | 1900 L. m., Ct. 0. Sars, Crust. 

 Norway, u3 p. 69 t. 49 | 1900 L. m., Zimmer in: Fauna arctica, v.l p. 427, 435 | 1908 

 L. m., Zimmer in: Ergeb. Tiefsee-Exp., v.8 p. 182 \ 1912 L. maerurus, T. Stebbing in: 

 Ann. S. Afr. Mus., v. lOv p. 153, 154. 



Pseudorostral lobes short, a little upturned. Carapace large, hirsute, 

 more than twice as long as the group of pedigerous segments, in the c? 

 having a pair of very conspicuous, coarsely serrated, infero-lateral carinae. 

 Pleon long and slender, 5*^' segment very long, twice as long as the 6*^ 

 telson shorter than the 6**", with 1 pair of lateral spinules, the apical spines 

 long. Antenna 1 9, P* joint longer than 3*^, 3<^ than 2'"'^, flagella 3-jointed, 

 principal flagellum in d 4-jointed, surrounded by brush of setae. Antenna 

 2 6, 5*^ joint scarcely twice as long as 2"*^. Peraeopod 1, 2"*^ joint scarcely 

 as long as C-,^^ and 7**' joints combined, 5*'* rather more than twdce the 7*^, 

 C)^^ thrice. Peraeopod 2, b^^ joint a little longer than the 7*^. Exopods of 

 3'i and 4^^ pairs in 9 minute, 2-jointed. Pleopod 1 wdth peduncle distally 

 narrow^ed. Peduncle of uropods as long as 5*^ pleon segment, with 9 spines 

 on medial margin; endopod about Vs*^*" of peduncle, 

 1**^ joint longer than 2"*^, shorter than 3^ spines 

 respectively in 9 2, 1, 2, in d 4, 2, 3; exopod reaching 

 middle of 3*^ joint of endopod. Colour greyish white. 

 L. about 5 mm. 



Coast] of Norway, depth 75— 470 m; 

 Atlantic 989 m. 



cold area of N. 



8. L. maeruroides Stebb. 1912 L. m., T. Stebbing 

 in: Ann. S. Afr. Mus., v. lOv p. 153 t. 56. 



Near to 7>. macrums, but with the lower margin 

 and the infero-lateral carinae of the carapace in the 

 6 machicolated in the anterior half after the fashion 

 of /.. vlllo.ms (nr. 4); hind margin a little upturned, 

 some of the pedigerous segments and first 2 of the 

 pleon with latero-ventral spines, 5*^^ pleon segment not 

 quite twice as long as the 6*^ to which the telson 

 is equal, with its distal section more narrowed, but 

 similarly armed as in L. macrnru/^. Antenna 1, principal 

 flagellum 5-jointed, accessory 4-jointed, in each the ter- 

 minal joint minute. Antenna 2, 5*'^ joint nearly thrice as 

 long as 2"'^. Peraeopod 1, 2°^ joint long, strongly bent. Peraeopod 2. b^^ joint 

 decidedly longer than 1^^. Pleopods with peduncle parallel-sided. Peduncle of 

 the uropods about tAvice and a half as long as the telson, but much less, than 

 twice the endopod, with 11 spines on the medial margin; endopod's P* 

 joint longer than 2^^^, shorter than 3*^ spines on medial margin respectively 4, 

 3, 2. L. adult (5 about 5 mm, o unknown. 



S. Africa, Cape Natal N. by E. 24 miles, depih 805 m. 



Fig. 77. 



L. maeruroides (cJ) Steb- 

 bing, antenna i. 



