Cumacea: 11. Diastylidae, 5. Makrokylindrus 



119 



3. M. eingulatus (Calm.) 1905 Diasti/lis c, Caiman in: Siboga-Exp., nr. 36 

 p. 2, 19 t. 2 f. 2«— 29 I 1908 D. cingulata, Zimmer in: Ergeb. Tiefsee-Exp., D. 8 p. 183 | 

 1912 Makrokylindrus eingulatus, T. Stebbing in: Ann. S. Afr, Mas., v. 10 v p. 150. 



Pseudorostral lobes well produced, horizontal, 

 subacute, with 2 apical spines. Carapace subglobose, 

 encircled about at the middle by a stout sinuous 

 ridge closely set with stout spines, in front of 

 ridge many spines, mostly uncinate and distally 

 tuberculate, and on each side a single smooth straight 

 spine longer than the rest; behind the ridge spines 

 larger, less crowded, short, stout, conical; lower 

 margin fringed with spines at the rear short and 

 thick, towards the front long and slender. Eyelobe 

 and eye wanting. Pedigerous segment 2 at the 

 sides covering the 1 ^S 'M and 4^^' fused, their side- 

 plates not expanded, those of the 5*'! not extended 

 backwards. Pleon segments 1—6 beset with spi- 

 nules. Telson longer than peduncle of uropods, V4*^^ 

 of length cylindric, with sides denticulate near the 

 base, the tapering post-anal fourth slightly decurved, 

 with subapical pair of setules and apical pair of 

 spinules. Antenna 1, first 2 joints of peduncle rather 

 long, accessory flagellum small. Peraeopod 5 arti- 

 culated near the dorsal surface of the segment. 

 Peduncle of uropod about Vg*^^ as long as telson, 

 with 8 spinules on distal half of the medial margin; 

 •endopod not quite half as long as the peduncle, 

 with long slender spines on the medial margin, P* 

 joint longer than 2°^ and 3'^ combined, 2"<i longer 

 than 3*^. exopod only reaching end of the 2'^'^. L. 

 d juv. 15 mm. 



Malayan Archipelago: Lat. 5« 40' 7' S., long. 120" 

 45' 5 E., depth 1158 m; lat. 6o 24' S., long. 124" 39' E., 

 depth 2798 m. 



4. M. dubius (Bonnier) 1896 Diastylopsis (?) diibia, Fig- ^4. 



J. Bonnier in: Ann. Univ. Lyon, v. 26 p. 539 t. 30 f. 3, ^- '^^"^'ilatu^s^^d juv.) (Cal- 

 3a— m I 1900 D. (?) tumida (laps, for dubia), (y. 0. Sars, ^ 



•Crust. Norway, v. '6 p. 64 | 1905 D (?) dubia, Caiman in: 



Siboga-Exp., nr.36 p. 23 | 1908 D. (?) d., Zimmer in: Ergeb. Tiefsee-Exp., v.8 p. 182 | 

 1912 D. (?) d., T. Scott in: Sci. Invest. Fish. Scotl., 1911 nr. 1 p. 4 t. 1 f . 5 | 1912 

 Makrokylindrus dubius, T. Stebbing in: Ann. S. Afr. Mus., v. lOv p. 150. 



Pseudorostral lobes horizontal, acute, with apical pair of spines. Cara- 

 pace and other parts of body beset with spinules and spines. Pedigerous 

 segments 3 and 4 dorsally coalesced, the postero-lateral corners not extended 

 backwards. Telson longer than peduncle of uropods, full Vs*^^ of length 

 cylindric, with lateral series of spinules (or serration Scott), last third tapering, 

 armed only with apical pair of spinules. No eye. Antenna 1 with long 

 spinose P* joint, 2^^ intermediate in length between 1^* and 3'^, flagellum 

 4-jointed, the small accessory 3-jointed. Mandible with 17 spines in spine-row. 

 Maxilliped 1 with about 10 small branchial leaflets. Maxilliped 3, 2''^ joint 

 distallv widened, moderately produced. Rudimentary exopods on peraeopods 



