172 Cumacea: 24. Nannastacidae, 3. Nannastacus 



projected, the ends usually a little divergent. Peraeopod 1 with 4 — C laminar 

 spines on lateral margin of 2^^ joint, 7*^ joint more than half as long as 

 (\^K with long thin spine-like claw. Peduncle of uropods long and narrow, 

 especially in the d, more than twice as long as the exopod which is from 

 four-fifths to three-fourths as long as the endopod and has a longer apical 

 spine; endopod with 4 spines on medial margin in §, 7 in d. Colour greyish 

 white, with some darker patches in front. L. 3 mm. 



Mediterranean, at Spezia; depths 11 — 19 m. 



8. N. braehydaetylus Calm. 1905 N. b., Caiman in: Siboga-Exp., nr. 36 p. 2, 

 14 tf. 3 a— e. 



Allied to A\ longirostris, but integument not setulose, pseudorostral 

 lobes less elongate, not apically divergent, antero-lateral margin very short, 

 lower corner quadrate: telsonic segment broader than long; eyes very large, 

 dark, near together; peraeopod 1 very stout, 7*^ joint less than one-third 

 of the length of the 6*^^, with very short stout curved claw; peduncle of 

 uropods a little more than one and a half times the length of the endopod, 

 which has a short apical spine and 7 spines on the medial margin: exopod 

 incomplete, apparently agreeing with that of N. longirostris. L. 6 !•(> mm. 

 9 unknown. 



Sailus Ketjil, Paternoster Islands (Simda-Sea?); surface. 



9. N. ossiani Stebb. 1900 j\^. o., T. Stebbing in: Willey, Zool. Results, 

 pars 5 p. H06, 612 t. 64A j 1904 N. o., Caiman in: Herdman, Rep. Ceylon Pearl J'ish., 

 V.2 p. 177 I 1905 N. o., Caiman in: Siboga-Exp., nr. 36 p. 12. 



Pseudorostral lobes obliquely upturned, apically rounded, the distal part 

 concentrically ridged, bases of 3 spines below the upturned lobes (shown in 

 figure); antero-lateral corners blunt, little produced. Carapace tumid, median 

 line in profile with long anterior and short hinder convexity, branchial regions 

 inflated. Fourth and fifth pedigerous segments having the centre dorsally 

 much elevated. Pleon segments with pellucid lateral carinae and pair of 

 serrate dorsal carinae, distally extended into a strong tooth in segments 1 — 5, 

 segment 5 not greatly longer than any other, telsonic segment apically pointed. 

 Eyes wide apart, dark, apparently composed each of 3 corneal lenses. Flagellum 

 of antenna 2 comparatively short, 10-jointed. In peraeopod 1, 5^^ joint sub- 

 equal to 6*^, but considerably longer than 6*'^ in 3*^. 4^^^. and b^'^ pairs. 

 Peduncle of uropods a little shorter than the slender exopod, which is no 

 doubt shorter than the much stouter (broken) endopod. L. d 2 mm. o 

 unknown. . . 



Blanche Bay, New Britain; surface. 



10. N. hanseni Calm. 1905 N. h.. Caiman in: Siboga-Exp., nr. 36 p. 11 tf. 1 a — e. 



Pseudorostral lobes horizontal, apically truncate, not ridged, not meeting 

 either above or below the branchial orifice; antero-lateral corners blunt, 

 obscurely serrate, slightly produced. Carapace depressed in median line 

 between the inflated branchial regions, elevated behind into bilobed prominence 

 overhanging some of the pedigerous segments, of which the last 3 have each 

 a dorsal pair of spinose prominences. Pleon segments 1 — 4 have lofty spine- 

 tipped pairs of prominences, the 5*^^ segment a much lower pair, telsonic 

 segment apically pointed. Eyes large, dark, each with 3 corneal lenses. Limbs 

 as in N. ossiani (nr. 9), and probably also the uropods, the unbroken endopod 



