Cumacea: 11. Diastylidae, 7. Leptostylis 125 



Oth longer than 5tii whicli is more than twice the 7*''. Peraeopod 2, 1^'^ joint 

 nearly as long as 5^K not twice the (S^^. Rudimentary exopods of 3^1 and 

 4*^ pairs very small, 2-jointed. Peduncle of uropods about twice as long 

 as the telson^ not much longer than the endopod, which has P^ joint nearly 

 as long as the subequal 2"^ and 3^ combined, spines on the medial margin 

 respectively 3, 1, 1; exopod about s/gds as long as endopod. Colour dark 

 yellowish grey or fuscous. L. adult Q (i mm. 



Whole coast of Norway, depth 38— 188 m; Rodbeig, 457— 549 m; Sweden and 

 Denmark, 15 — 30 m; Gulf of Maine, 95—165 m. 



4. L. villosus 0. Sars 1869 L. villosa, G. 0. Sars in: Nyt Mag. Naturv., u 16 

 p. 344 I 1872 L. v., G. 0. Sars in: Forh. Selsk. Christian., 1871 p. i!70 | 1900 L. v., G. O 

 Sars, Crust. Norway, v.'6 p. 71, 108 t. 50 f . 2 | 1900 L. v., Zimmer in: Fauna arctica, v. 1 

 p. 427.435 I 1901 L. v., T. Scott in: Rep. Fish. Board Scotl., u 19 p. 275 t. 18 f. 41 | 

 1908 L.V., Zimmer in: Ergeb. Tiefsee-Exp., v.S p. 182 | 1912 L. villosus, T. Stebbing 

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



Densely hirsute. Pseudorostral lobes shortly and bluntly produced, the steep 

 sides and rounded lower border not acutely serrate but cut into square- 

 topped divisions, machicolated. Carapace large and deep, eyelobe minute. 

 Pedigerous segments produced forwards in a submedian pair of tooth-like 

 processes. Pleon very slender. Telson shorter than the 6*^ pleon segment, 

 with 1 pair of lateral spinules. Antenna 1, 3^ joint as long as l^\ longer 

 than 2"'^. Peraeopod 1 elongate, 2"'^ joint about 2/5*^^ of the total length of 

 the limb, ()^^ joint much longer than 5*^1 which is fully twice the 7*''. 

 Peraeopod 2, 7*^ joint longer than 5"'. Rudimentary exopod of 'i^ and i^^ 

 pairs extremely small. 2-jointed. Peduncle of uropods more than twice as 

 long as the telson. but little longer than the endopod, of which the P* joint is 

 not nearly equal to the 2"^^ and 3^ combined, 3^ rather longer than 2"^ spines 

 of medial margin respectively 2, 1, 1, exopod a little longer than first 2 joints 

 of endopod. Colour light fuscous. L. 4 mm. d unknown. 



Norwegian coast, depth 113— 188m; Clyde, 73 m; S. of Shetland Isles, 110—120 m. 



5. L. crassicauda Zimmer 1907 L. c, Zimmer in: Zool. Anz., v.'6l p. 223. 



Sparsely hairy. Carapace inflated, about thrice as long as the steeply 

 sloping group of pedigerous segments, antero-lateral margin denticulate. 

 Telson about as long as 6*^ pleon segment, with 1 pair of lateral spines. 

 Peraeopod 1 long, 5^^ and 6*^ joints subequal, 7*^ shorter than either. 

 Peduncle of uropods nearly twice as long as the telson, with <> spines on 

 the medial margin; endopod longer than the exopod, a little shorter than 

 the peduncle, P* joint longer than 2""^, subequal to 3^, spines on medial 

 margin respectively 2, 1, 1. Colour white. L. d juv. about 3-5 mm. 



Winter Station, German South Pole Exp. (lat. 66° 2' S. long 89 » 38' E.) 



6. L. borealis Steppers 1908 L. b., Stappers in: Arch. Zool. exper., ser. 4 v.S 

 notes p. 102 tf . 4, 5 | 1911 L. h., Stappers in: Camp. arct. Orleans, Crust. Malac. p. 120 

 t. 7 I 1912 L. h.. T. Stebbing in: Ann. S. Afr. Mus., v. lOv p. 153. 



Somewhat hirsute. Pseudorostral lobes shortly and obtusely produced, 

 slightly upturned. Carapace much less than thrice as long as the group of 

 pedigerous segments. Pleon slender, telson shorter than (3*^ segment, with 

 1 pair of lateral spines. Antenna 1, 3^ joint shoiter than l^S longer than 2"^ 

 flagella very unequal, both 3-jointed. Peraeopod 1 elongate, 2°*^ joint much 

 shorter than rest of limb, 5«i about 3/4*!'^ of 6**1 and nearly twice 1^\ Peraeo- 

 pod 2. 7*1^ joint nearly equal to 5^^ and ^^^^ combined. Exopods of 3'^ and 



