Cumacea: 15. Ekdiastylidae, 1. Ekdiastylis, 16. Holostylidae, 1. Holostylis 139 



pair much to the rear. Pedigerous segments with few denticles in trans- 

 verse rows, side-plates of 2"*^ and 3*^ coarsely crenulate, 5*^ segment with 

 4 denticles of some size, the hind angles shortly but acutely extended. Pleou 

 segments somewhat nodose and denticulate. Telson longer than peduncle 

 of uropods, its narrowed hinder half carrying 5 pairs of lateral spines. An- 

 tenna 1 with 2°*^ and 3'^ joints of peduncle subequal. Peraeopod 2 with 7*^'^ 

 joint little longer than 6*^^. Peduncle of uropods nearly twice as long as 

 the exopod, which is considerably longer than the endopod; l^*' joint of the 

 latter rather longer than the 2"**, each with 2 spines on the medial margin, 

 the apical spine as long as the 2°^ joint. L. 9 juv. scarcely 6 mm. 



N. America, lat. 39» 54' N., long. 73" 15' W., depth 56—66 m, Cape Ann, 66 m, 

 Casco Bay, 31 m. 



9. E. flmbriatus (0. Sars) 1873 Diastylis finihriata, G. 0. Sars in: Svenska 

 Ak. Haudl., n. ser. v. 11 nr. 5 p. 7 t. 2 f . 4— 9 | 1912 Ekdiastylis fifnbriaf us, T. Stebbing 

 in: Ann. S. Afr. Mus., v. lOv p. 155. 



Pseudorostral lobes apically ' bent downwards, carapace with only the 

 anterior part of the lower margin serrate, while somewhat above the lower 

 margin each side (in d only) is carinate with a remarkable fringe of teeth 

 encreasing in size to the rear. Pedigerous segments 2 — 4 have the side- 

 plates pectinately fringed and expanded beyond the 1^*^ and 5^'' segments. 

 The last has its sides sharply extended backwards and equipped with spinules 

 and plumose setae; the 3*^ and 4*^^ pedigerous and (in the d) the first pleon 

 segments have 2 longitudinal rows of medio-dorsal l)ackward-directed spinules, 

 and the first 4 pleon segments extend the postero-lateral corners into a 

 sharp tooth, which in the 2"^^ to the 4t'i follows a denticulate ridge. Pleon 

 segments in 9 not dentate. Telson subequal to peduncle of uropods, the 

 narrowed distal half carrying in the d 7 pairs, in the 9 3 pairs, of unusually 

 long spines and a rather shorter apical pair. Eyelobe flat, without eye. 

 Antenna 1 in d short, stout, with brush of sensory filaments at base of 

 4- (or 0-) jointed principal flagellum, accessory 2-jointed; in 9, 3<^ joint of 

 peduncle linear, longer than 2'^*^, the flagella 3- and 2-jointed. Antenna 2 

 of cJ extending beyond the uropods. Peduncle of uropods with 12 spines 

 on medial margin in (5, 4 in 9; exopod about %*^^ as long as the peduncle, 

 endopod shorter, with 8 and 7 spines on medial margin respectively of l'"^ 

 and 2"<i joints in d, 2 and 3 in 9 . L. d scarcely 6 mm. 



S. Atlantic, lat. 23° 41' S., long. 41" 47' W. 



16. Fam. Holostylidae 



1912 Holostylidae, T. Stebbing in: Ann. S. Afr. Mus., v. lOv p. 133, 146. 



Telson large with only 2 apical spines. Antenna 1 with accessory 

 fiagellum small. Maxilliped 1 with branchial leaflets numerous. Maxilli- 

 ped 3 with 2^^ joint very elongate and distally produced. Peraeopods 1 — 4 

 with exopods in the male, only the first two pairs having them in the female. 

 Only two pairs of pleopods in the male. Endopod of uropods 1-jointed. 



1 genus. 



1. Gen. Holostylis T. Stebbing 

 1912 Holostylis, T. Stebbing in: Ann. S. Afr. Mus., v. 10 v p. 133, 146. 

 With the characters of the family. 



2 species. 



