Cumacea: 11. Diastylidae, 5. Makrokylindrus 



117 



5. Gen. Makrokylindrus T. Stebbing 



1912 Makrokylindrus, T. Stebbing in: Ann. S. Afr. Mus., v. 10 v p. 129, 146, 150. 



Carapace denticulate; no distinct eye; telson elongate, basal portion 

 cylindric, much longer than the post-anal portion, which carries only the two 

 apical spines. Peraeopods of the female, so far as known, without rudimentary 

 exopods on the third and fourth pairs. 



6 species. 



Synopsis of species: 



I Telson distally serrate 1. M. serricauda 



) Telson not distally serrate — 2. 



( Carapace wiih transverse raised girdle — 3. 

 " ) Carapace without transverse raised girdle — 4. 



) Eyelobe distinct 2. M. fragilis 



) Eyelobe wanting 3. M. cingulatus 



I I'edigerous segments .3 and 4 dorsally fused 4. M. dubius 



i Pedigerous segments 3 and 4 not dorsally fused — 5. 



_ j Pedigerous segments smooth .'i. M. erinaceus 



^ \ Pedigerous segments spinose . 6. M. josephinae 



1. M. serricauda (T. Scott) 1912 Diasfyiis s., T. Scott in: Sci. Invest. Fish. 

 Scotl., 1911 nr. 1 p.3 t. I f. 1— 4 | 1912 Makrokylindrus s., T. Stebbing in: Ann. S. Afr. 

 Mus., vAOv p. 150. 



Near to M. josephinae (nr. 6) 

 but distinguished by the telson. 

 Pseudorostral lobes well produced to 

 a blunt apex. Carapace dorsally 

 strongly spinose and spinulose, lower 

 margin pectinate for more than half 

 its extent from the front. Pedigerous 

 segment 5 the longest, its postero- 

 lateral angles rounded. Pedigerous 

 segments and pleon all dorsally 

 rough with spicules, the pleon seg- 

 ments also ventrally. Telson rather 

 longer than peduncle of uropods, 

 only slightly narrowing in the distal 

 third, the sides of which are coarsely 

 serrate, with intervening setules; "^/j if 

 the apical spines stout, somewhat // /• 

 divergent. Endopod of uropods 

 slightly longer than the exopod, p. ^^ 



half as long as the peduncle, its M. serricauda (^) (T. Scott), telson and uropod. 



P* joint twice as long as the 2 



subequal following joints combined; spines on the medial margin of the 3 



joints respectively 7, 1, 1. L. Q about 12 mm. 



Lat. 59'^ 36« N., long. 7 o 00' W., depth 140 m. 



2. M. fragilis Stebb. 1912 M. /'., T. Stebbing in: Ann. S. Afr. Mus., r. lOv 

 p. 150 t. 54, 55. 



Pseudorostral lobes well produced subacutely in front of the prominent 

 rounded eyeless eyelobe, with dorsal denticles near to the meeting line. 



