Cumacea: 24. Nannastacidae, 1. Schizotrema 165 



Pearl Fish., 1.2 p. 176 | 1905 N. (part.), Caiman in: Sci. Invest. Fish. Ireland, 1904 

 app. 1 p. 22 I 1905 N. (part.). Caiman in: Sibop:a-Exp., nr. 36 p. 10 | 1906 N. (part.), 

 Caiman in: Mt. Stat. Neapel, i'. 17 p. 417 | 1907 N. (part.), Zimmer in: Zool. Anz., «. 31 

 p. 369 I 1911 N. (part.), Caiman in: Tr. zool. See. London, w. 18iv p. 341 | 1912 N., 

 T. Stabbing in: Ann. S. Afr. Mus., v. lOv p. 133, 164. 



Pseudorostral lobes with antero-lateral corners well expressed. Telson 

 wanting. Eyes sometimes developed as a distinctly separated pair. Accessory 

 flagellum of first antenna very small. Second antenna of female one-, 

 two-, or sometimes three-joiuted. Mandibles normal. First maxilla with 

 two filaments to the palp or only a single filament. First four pairs of 

 peraeopods in male with exopods. in the female only the first two pairs or 

 none. No pleopods in either sex. Uropods with the endopod simple. 



6 genera accepted, 1 doubtful. 



Synopsis of accepted genera: 



I Eyes, when present, paired — 2. 



\ Eyes, when present, not paired — 4. 



( Exhalant respiratory orifices paired 1. Gen. Schizotrema 



\ Exhalant respiratory orifice single — 3. 



1 First and second peraeopods of the female without 

 exopods 2. Gen. Paranannastacus 

 First and second peraeopods of the female with 

 exo])ods 3. Gen. Nannastacus 



(Alimentary canal spirally coiled; Ist maxilla with 

 single filament 4. Gen. Platycuma 

 Alimentary canal not coiled, 1st maxilla with 2 

 filaments — 5. 

 / Carapace more or less overhanging anterior pedi- 



) gerous segments 5. Gen. Cvunellopsis 



i Carapace not overhanging the anterior pedigerous 



y segments 6. Gen. Cumella 



1. Gen. Schizotrema Caiman 



1911 Schizotrema, Caiman in: Tr. zool. Soc. London, r. 18iv p. 341. 360 i 1912 

 ,S., T. Stebbing in: Ann. S. Afr. Mus., v. lOv p. 164. 165. 



Respiratory orifices paired, wide apart. Pseudorostral lobes not meeting 

 in front. Carapace somewhat depressed, not or little overhanging pedigerous 

 segments. Third maxillipeds and first and second peraeopods with exopods 

 in female. Other characters as in Nannastacus (p. 168). 



4 species. 



Synopsis of species: 



( Uropods with peduncle longer than the endopod 1. S. calmani 



\ Uropods with peduncle not longer than the endopod — 2. 



/ Uropods with endopod little longer than the peduncle . . 2. S. depressura 

 \ Uropods with endopod very much longer than the peduncle — 3. 



/ Telsonic segment longer than preceding segment, apically 



I acute 3. S. blfrons 



i Telsonic segment shorter than preceding segment, apically 



' rounded . • 4. S. sordidum 



