54 Cumacea: 5. Leptocumatidae, 1. Leptocuma, 6. Chalarostylidae, 1. Chalarostylis 



thirds as long, carrying 15 spines, of which the apical are large. The 18 spines 

 on lateral margin of exopod's 2^^ joint are blunt-ended. L. 9 14 — 22-5 mm. 

 d unknown. 



South Atlantic, off mouth of Rio Plata, depth 94 m; Straits of Magellan. 



2. L. minus Calm. 1912 L. minor. Caiman in: P. U. S. Mus., vAl p. 61 6 tf. 14—20. 



Pseudorostral lobes truncate, meeting a short space in front of the small 

 eyelobe; with a small sinus and slightly advanced antero-lateral angle. Carapace 

 short. Pedigerous segments 2, 3, with side-plates greatly expanded. Telsonic 

 segment considerably shorter than the one preceding it, about 2/4*^^ of peduncle 

 of uropod. Eye pigmented. Antenna 1, flagellum 2-jointed, accessory 1-jointed. 

 Antenna 2 of 9 3-jointed, last joint bluntly conical, twice as long as width 

 at base. Mandible with premolar part long, about 6 spines in spine-row. 

 Maxilliped 1 with about 8 branchial leaflets. Maxilliped 3 with 2"'^ joint 

 slightly produced. Peraeopod 1 with 2""^ joint slightly longer than rest of 

 limb, 7*^ little shorter than b^^ or 6*^. Peraeopod 2, 5*^ joint little longer 

 than 4*^, a little shorter than 6^^ and 7^^ combined, 7^^ not quite as long as 

 gth Peraeopod 4 of 9 with rudimentary exopod of 2 joints, the 2""^ minute. 

 Exopod of uropods a little shorter than the peduncle, a little longer than 

 the endopod; l®* joint of the latter more than twice as long as the 2"'^ 

 L. 9 7*5 mm, c? 6-4 mm. 



U.S.A., Wood's Hole; Gloucester Harbor, depth 15 m. 



6. Fam. Chalarostylidae uom. nov. T. Stebbing 



1912 Hemilampropidae, T. Stebbing in: Ann. S. Afr. Mus., v. 10 v p. 133, 143. 



Telson ample, with more than 2 apical spines. Antenna 1 with both 

 tiagella well developed. Palp of maxilla 1 with 2 tilaments. Peraeopods 1 — 4 

 with exopods in both sexes well developed except those on the 3*^ and 4*^ pairs 

 of the female which are rudimentary. Peraeopod 1 with 2"'^ joint much shorter 

 than the rest of the limb. Male with only 3 pairs of pleopods. Uropods 

 with the endopod 3-jointed. 



2 genera. 



Synopsis of genera: 



f Telson small in relation to the peduncle of the uropods 1. Gen. Chalarostylis 

 ( Telson large in relation to the peduncle of the uropods 2. Gen. Hemilamprops 



1. Gen. Chalarostylis A. M. Norman 



1879 Chalarostylis, A. M. Norman in: Ann. nat. Hist., ser. 5 v.3 p. 65 \ 1900 C, 

 G. 0. Sars, Crust. Norway, v.S p. 26 | 1912 C, T. Stebbing in: Ann. S. Afr. Mus., 

 V. lOv p. 144. 



Telson short, with three apical spines. Uropods remarkably long and 

 slender. Female unknoAvn. 



1 species. 



1. C. elegans Norm. 1879 C. e., A.M.Norman in: Ann. nat. Hist., ser. 5 v.3 

 p. 66 I 1912 C. e., T. Stebbing in: Ann. S. Afr. Mus., v. 10 v p. 144. 



Pseudorostral lobes forming no sinus. Carapace not deep but wide, 

 spinulose, anteriorly with medio-dorsal crest of about 10 small spines. Anterior 

 margin of pedigerous segments smooth, side-plates of fifth not produced 



