Cumacea: 12. Colurostylidae, 2. Auchicolurus, Genus incertae sedis 



131 



a suture, 5*^ with serrate front margin and dorso-lateral carinae extended 

 into acute postero-lateral teeth. Pleon segments 1 and 2 in d with mid- 

 venti'al backward pointing tooth and segments 3 — 5 each with a pair of 

 ventral articulated spines. Telson caiTying distal 

 setae and slightly longer than broad in d, but 

 not longer and unarmed in Q . Eye without 

 pigment in either sex, larger in the c5". with 

 3 lenses in the 9 . Antenna 1 with 2°*^ joint 

 of peduncle the shortest, flagellum 4-jointed in 

 9, 5-jointed in d, accessory 3-jointed, much 

 smaller in 9 than in d. Antenna 2 of 9 4-jointed, 

 Z^ joint large, ovate, serrated, 4*^ minute, flagel- 

 lum in d elongate. Maxilliped 3 with apex of 2'^'^ 

 joint expanded, not produced, carrying plumose 



setae, 3*^ joint with comb-like 



row of spinules. Peraeopod 1 



with long 2^1*^ joint, distally 



narrow; peraeopod 2 with d^^ 



joint longer than seventh, very 



unusual in this pair; 3*^ and 



4**^ pairs with 2-jointed exo- 



pod in 9 conspicuous though ^ oecidentauf(cLau). telson 

 small. Peduncle 01 Uropods and uropod, 6 = tip of endopod of 

 not quite twice as long as the uropod (more magnified). 



exopod; endopod about y^^^^ 

 as long as the exopod, 3-jointed, 1^* joint nearly 4 times as long as the 

 other 2 combined, exclusive of the long spiniform process produced far 

 backward from the lower surface of the 3"^. L. 9 12 mm or more, d 

 11-8 mm. 



0£f Oregon, lat. 430 01' 00" K, long. 124o 30' 30" W., depth 64 m; Pacific 

 Grove, California; Monterey-Bay, California, depth 16 m. 



Fig. 86. 



A. occidentalis ( 5 ) (Cal 



man), antenna 2. 



Genus incertae sedis, near Colurostylidae 



Gen. Pachystylis H. J. Hansen 



1895 Pachystylis, H. J. Hansen in: Ergeb. Plankton-Exp., v.2 G. c. p. 58 | 1908 

 P., Zimmer in: Ergeb. Tiefsee-Exp., v. 8 p. 169, 181. 



General form as in Diastylis (p. 89) but telson short, cylindiical with- 

 out apical spines. Eye wanting. Antenna 1 with accessory flagellum short. 

 Mandible with strong molar, few spines in the spine-row on the short distal 

 section. Maxilliped 3 with second joint much dilated distally, third joint 

 short but broader than the fourth. First four peraeopods in the male, only 

 the first two pairs in the female, carrying exopods. Endopod of uropods three- 

 jointed. (Pleopods of male unkown). 



1 species. 



P. rotundatus H. J. Hansen 1895 P. rotundata. H.J. Hansen in: Ergeb. Plank- 

 ton-Exp., v.2 G. c. p. 58 t.'y f. 2— 2e. 



Pseudorostral lobes moderately produced in front of the eyeless eye- 

 lobe; antero-lateral corners acute in 9, rounded in 6. Antenna 1, principal 



9* 



