Cumacea: 24. Nannastacidae, 6. Curaella 179 



{Pseudorostrum long, the lobes meeting well in front of 

 the eyelobe 4. C. forficula 

 Pseudorostrum short, the lobes scarcely meeting in front 

 of the eyelobe 5. C. clavieauda 



, Peduncle of uropods more than twice as long as the 



I telsonic segment 6. C. leptopus 



j Peduncle of uropods less than twice as long as the 

 ' telsonic segment — 7. 



{Fifth peraeopod with 5th joint very much longer 

 than 6th — 8. 

 Fifth peraeopod with 5th joint not very much longer 

 than 6th _ 9. 

 I Telsonic segment longer than peduncle of uropods . . 7. C. hispida 

 \ Telsonic segment shorter than peduncle of uropods . . 8. C. serrata 

 f Uropods with endopod not longer than exopod .... 9. C. laevis 

 I Uropods with endopod longer than exopod — 10. 



/ Pseudorostrum short, obtuse, horizontal 10. C. pygmaea 



\ Pseudorostrum rather long, acute, somewhat upturned . 11. C. limicola 



1. C. australis Calm. 1907 C. a., Caiman in: Nat. antarct. Exp., u2 Crust. Cum. 

 p. 4 tf. 7— 13 I 1907 C. a., Zimmer in: Zool. Anz., u31 p. 369 | 1911 C. a., Caiman in: 

 Tr. zool. Soc. London, u 18iv p. 344. 



Pseudorostral lobes short, vertically truncate, raeetiug in front of the 

 snbglobular e3'elobe, the front margin forming a semicircular concavity, the 

 antero-lateral corners rounded, with strong serration continued a short 

 space along the lower margin. Carapace large, compressed, dorsal line arched, 

 serrate with about 20 large teeth and others, the foremost tooth overhanging 

 the eyelobe. Pedigerous segment 3 produced dorsally into a pair of conti- 

 guous teeth overhanging the following segment but with their concave side 

 forward. Pleon short, stout, cylindrical, with truncate end, 5*^ segment the 

 longest. Maxilliped 3, 2"^"^ joint with about 4 teeth on the medial margin, the 

 distal one very strong. Peraeopod 1 rather short and stout, 2^^ joint with 

 5 strong teeth on lateral margin distally. Peraeopod 3 with 2»<^ joint slender, 

 curved, longer than remaining joints combined, S^h nearly twice as long as 

 4*11 and once and a half the 6*^. Peduncle of uropods not quite twice as 

 long as the telsonic segment, last two-thirds of medial margin with dwindling 

 serration; endopod about two-thirds of peduncle, and exopod two-thirds of 

 endopod. L. 9 2-9 mm, d unknown. 



Antarctic Circle. 



2. C. graeillima Calm. 1905 C. g., Caiman in: Sci. Invest. Fish. Ireland, 

 1904 app.l p. 23 1. 1 f.5— 14 j 1911 C. g., Caiman in: Tr. zool. Soc. London, *;. ISiv p. 344. 



Q . Pseudorostral lobes separated almost completely or completely by 

 the narrow sightless eyelobe, bent almost straight upwards with spiniform 

 process at the apex, obliquely truncate with front margin descending almost 

 straight to the antero-lateral corner from which projects the largest of a 

 series of some 10 pellucid spines. Branchial siphons separate, very long, 

 spirally coiled. Carapace rather short, compressed, deep, with medio-dorsal 

 carina and about 4 long spiniform teeth. Pedigerous segments 1, 2 very 

 short, 4*^ with a forward curving dorsal spine (perhaps paired); side-plates 

 not extensive. Pleon long and slender, much longer than preceding part 

 of the body, 5*^ segment more than twice as long as the telsonic. Antenna 

 1 very long and slender, P* joint longer than 2"^^ and ^^ combined, flagellum 



