166 



Cumacea: 24. Naunastacidae, 1. Schizotrema 



1. S. calmani Stebb. 1912 S. c, T. Stebbing in : Ann. S. Afr. Mus., v. 10 v p. 165 t. 6 1 . 



Pseudorostral lobes upturned, widely divergent. Carapace with small 

 median eyeless eyelobe, median line finely denticulate and setulose, lateral 

 margins fringed with denticles conspicuous anteriorly, soon 

 dwindling away. Pedigerous segments 2 — 5 with laterally 

 flattened edges cut into denticles. Pleon segments 1 — 5 

 with dorsal and ventral lines of denticulation and lateral 

 ridges, 5*^ segment long, distally naiTowed, telsonic seg- 

 ment short. Antenna 1, 3"^ joint shorter than 2'"^. 

 Maxilliped 1 with last joint slender; branchial leaflets 

 about seven. Maxilliped .3 with ()*•' joint curved, apically 

 a little widened. Peraeopods 3, 4, Avith 2^^*^ joint piri- 

 form, the rest very slender. Peduncle of uropods denti- 

 culate along 3 edges, twice as long as the endopod; exopod 

 about Ys*''^* of endopod. L. d about 2-5 mm. o unknown. 



S. Africa, Cape Natal distant N. by E. 24 miles, 805 m. 



Fig. 11.'-,. 

 S. calmani ((5) Steb- 

 bing, antenna i, cara- 

 pace, pedigerous seg- 

 ments. 



2. S. depressum Calm. 1911 S. d., Caiman in: Tr. zool. 

 Soc. London, ». 18iv p. 341,361 t. 34 f. 14— 17. 



Pseudorostral lobes short, truncate, obliquely up- 

 turned, each surrounding the branchial orifice from which 

 a long branchial siphon is protrusible; front margin nearly 

 vertical, antero-lateral corner rounded, ending in curved 

 spine, from Avhich a dwindling series runs back, with 2 or 3 large ones at the 

 end. Carapace very broad and depressed, minutely granular, with long setae on 

 various parts of this section and the body in general. Pedigerous segments 

 broad and depressed, with large spines on the side-plates. Pleon short, all 

 segments but the l^^ with stout lateral spines, the telsonic segment a little 

 shorter than the 5*^ rotuudo-quadrate. Eyes dark, set just behind the 

 branchial orifices. Antenna 1, 3'^ joint longer than 2"*, flagellum 2-jointed. 

 Antenna 2 of Q with 2 teeth on anterior margin of the basal part, the apex 

 conically produced. Maxilliped 3 with 5**^ and 6*^ joints somewhat widened. 

 Peraeopods 3 — 5 short and stout, in the 3*^ pair the 5*^ joint hardly longer 

 than the 4*^^ and shorter than the 6^^, in the 5*^ pair the 5^^ joint about 

 one half longer than the 4*'^ and subequal to the 6*'\ Peduncle of uropods 

 a little longer than the telsoiuc segment, with 3 conspicuous teeth on the 

 medial margin; endopod a little longer than the peduncle, a little shorter 

 than the spine at its apex; the exopod more than three-fourths as long as 

 the endopod, with a long apical spine. L. 9 TS mm. 



Gulf of Siam, depth 2 m. 



3. S. bifrons Calm. 1911 S.b., Caiman in: Tr. zool. Soc. London, v. 18iv p.341, 

 362 t. 34 f. 18—21. 



Pseudorostral lobes short, obtuse, with irregular denticles on the lower 

 edge, the front margin thence receding to the base of a stout cylindrical 

 process which supplies the antero-lateral angle, being itself tipped with a 

 curved spine and fringed with denticles on its surface. The respiratory 

 orifices and liranchial siphons as in the preceding species. Carapace broad, 

 with scattered spinules or tubercles and short hairs. First pedigerous seg- 

 ment almost concealed, the rest broad, depressed, tuberculate. Pleon short, 

 the telsonic segment longer than the 5*^^ apically acute. Eyes dark, each 



