Cumacea: 24. Nannastacidae, 1. Schizotrema, 2. Paranannastacus 167 



with 3 lenses, placed just behind the branchial orifices. Antenna 1, with 

 2 spines at the end of P* joint. Hinder peraeopods rather long and slender; 

 in the oth pair the 5*'^ joint nearly thrice as long as the 4*^^ and a little 

 longer than the 6*''. Peduncle of uropods about half as long as the telsonic 

 segment, irregularly denticulate on both edges; endopod about two and a 

 half times as long as the peduncle, with stout apical spine about half its 

 length: exopod a little less than half as long as endopod, but with apical 

 spine reaching beyond it. L. Q r65 mm. 



Paumben, India, depth 2 — 9 ni. 



4. S. sordidum Calm. 1911 S. s., Caiman in: Tr. zool. Soc. London, «;. 18iv 

 p. 341,363 t. 34 f. 22— 24. 



Pseudorosti-al lobes short, truncate, obliquely upturned, the front margin 

 with concave recession to the sharply produced antero-lateral angle which 

 bears a transparent apical spine. Orifices and siphons as in the other species. 

 Carapace rather broad and depressed, with scattered long hairs. Pedigerous 

 segments broad, depressed, with scattered and a few pellucid spines. Telsonic 

 segment a little shorter than the 5*^'^, round-ended. Eyes dark, in the usual 

 position. Antenna 1, 3*^ joint slightly longer than 2^^, flagellum 3-jointed, 

 the last joint minute. Peraeopods 3 — 5 very long and slender; in the 5'^^^ 

 pair the 5*^ joint nearly 4 times as long as the 4*^ and one-third longer 

 than the 6*''. Peduncle of uropods not more than half as long as the telsonic 

 segment; the endopod more than thrice as long as the peduncle; exopod 

 about half as long as the endopod. L. 9 1 mm. 



Gulf of Siam, depth 2 m. 



2. Gen. Paranannastacus T. Stebbing 



1912 Paranannastacus, T. Stebbing in: Ann. S. Afr. Mus., v. lOv p. 164. 



Like Nannastacus (p. 168), but with no exopods on either the third 

 maxillipeds or the first and second peraeopods of the female. 

 2 species. 

 Synopsis of species: 



, Antero-lateral angles of carapace not produced beyond the 



I pseudorostrum LP. i-eptans 



j Antero-lateral angles of carapace produced beyond the 



y pseudorostrum 2. P. tardus 



1. P. reptans (Calm.) 1911 Nannastacus r., Caiman in: Tr. zool. Soc. London, 

 t\ 18iv p. 341, 356 t. 33 f.22— 28 | 1912 Paranannastacus r., T. Stebbing in: Ann. S. Afr. 

 Mus., V. 10 V p. 164. 



Pseudorostral lobes shortly produced, somewhat upturned, truncate, 

 meeting in the middle line below the branchial orifice, antero-lateral margin 

 deeply concave, antero-lateral corner acutely produced. Carapace little broader 

 than deep, depressed in middle line between the inflated branchial regions 

 and with a median convexity anteriorly. Pedigerous segment 1 reduced to 

 the side-plates, 5*'^ pedigerous and P*^ pleon segment each with a pair of 

 small spiniform dorsal teeth. The pair of eyes prominent and darkly 

 pigmented. Antenna 1, 2"*^ and 3^ joints subequal, and together subequal 

 to pt joint, principal flagellum with minute terminal joint. Maxilliped 3 and 

 peraeopods 1, 2, without exopods. In maxilliped 3 and peraeopod 1 the 2°*^ 

 joint is very short; not short but not inflated in peraeopod 2. Peduncle of 



