120 Cumacea: 11. Diastylidae, 5. Makrokylindrus 



3 and 4 of $ juv. supposed to be inconstant, l)ut possibly the young specimen 

 showing these appendages may have been a d juv. Endopod of uropods 

 rather more than half as long as the peduncle, slightly longer than exopod^ 

 1^* joint longer than 2""^ and 3*^ combined, spines on medial margin respect- 

 ively 4, 2, 2, with a longer apical spine. L. Q juv. 9 mm, d juv. 

 slightly larger. 



Bay of Biscay, depth 650 — 950 ni. 



5. M. erinaeeus (0. Sars) 1887 Diastylis c, G. 0. Sars in : Rep. Voy. Challenger^ 

 V. 19 pars 55 p. 9, 44, 68 t. 9 f. 9 — 14 | 1905 D. e., Caiman in: Sci. Invest. Fish. Ireland, 

 1904 app. 1 p. 47 I 1912 Makrokylindrus e., T. Stebbing in: Ann. S. Afr. Mus., v. 10 v p. 150. 



Pseudorostral lobes horizontal, acute, well produced in front of the 

 small eyeless eyelobe. Carapace large, tumid, without carinae, beset with 

 numerous forward pointing spines of generally uniform size, continued along 

 sides of pseudorostrum; anterior part of lower margin finely denticulate. 

 Pedigerous segments smooth with side-plates evenly rounded. Pleon seg- 

 ment 1 with serrate ventral keel, this and the next 2 segments each with 

 paired dorsal spines and postero-dorsal setae. Antenna 1 with spinose P* 

 joint. 2"*^ nearly as long, S*^ much shorter, accessory flagellum very smulL 

 Antenna 2 of Q 5-jointed, twisted. Peraeopod 1 very long, P* joint very 

 setose, 5*^ and 6^^ subequal, very long and slender, each much longer than 

 th6 7**^. Peraeopod 2 with 5*^ joint nearly twice the combined length of <)**^ 

 and 7th, Telson about as long as the 2 preceding segments together, two- 

 thirds smoothly cylindric, the post-anal third tapering to truncate apex which 

 carries a pair of small spines. Peduncle of uropods decidedly shorter than, 

 telson, probably longer than the rami (which are broken). L. 9 13 mm. 



Atlantic: Lat. 360 21' N., long. 230 31' W., depth 3700 m. 



6. M. josephinae (O. Sars) 1871 Diastylis j., G. 0. Sars in: Ofv. Ak. Forh., 

 r. 28 nr. 1 p. 77 | 1871 D.j., G. 0. Sars in: Svenska Ak. Handl., n. ser. ». 9 nr. 13 p. 36- 

 t. 15 f. 72—74 I 1879 D.j., A. M. Norman in: Ann. nat. Hist., ser. 5 u 3 p. 56 | 1900 D.j., 

 Zimmer in: Fauna arctica, v.l p. 422 | 1905 D.j. (?part.), Caiman in: Sci. Invest. Fish. 

 Ireland, 1904 app. 1 p. 10,44 | 1912 Makrokylitidrus j., T. Stebbing in: Ann. S. Afr. JiJus.,. 

 vAO\ p. 150. 



Pseudorostral lobes well produced in front of the small eyeless eyelobe, 

 horizontal, acute, with apical pair of spines. Carapace large and deep, armed 

 on surface with crowded spinules interspersed with spines; especially con- 

 spicuous are series formed by 5 pairs of spines commencing on the pseudo- 

 rostral lobes, and between these rows 4 submedian pairs. Pedigerous seg- 

 ments with transverse dorsal rows of spinules, sides of last segment bluntly 

 extended; pleon segments spinulose all over; telson longer than peduncle of 

 uropods, basal two-thirds cylindric, having in the type specimen about 14 pairs 

 of lateral and 5 ventral spines but none on the tapering end except the 

 apical pair, whereas in an ovigerous Q Caiman found basal part with no 

 lateral serrations but on each side of post- anal part 10 or 11 small teeth 

 C^M.serricmida Scott, p. 117). Antenna 1 slender, 2"'^ joint the longest. Peraeo- 

 pod 1 very long. Peraeopod 2, 5*^^ joint considerably longer than 6*'^ and 

 7*'^ combined. Endopod of uropods appears to be only 2-jointed in young 

 specimens and subequal to the exopod, which with advancing age it exceed* 

 in length, at the same time becoming 3-jointed. L. over 11 mm. 



Off Portugal, lat. 380 10' 30" N., long. 90 25' W., depth 1412 m; N. of Faro 

 Islands, lat. 48o 50'— 67" 7' N., long. 3° 6'— ll" 9' W., 629— 1326m; off W. of 

 Ireland, depth 364—699 m. 



