Haustorius, Cardenio 125 



much produced, 3<^ sharply beut, 4*ii wauting. Gnathopod 1 simple, 5*^ Joint 

 niucli broader and louger than 6^^, finger small. Gnathopod 2, forming a 

 minute chela. Peraeopods 1 and 2, 4:^^ and ö^^^ joiuts ratlier broad, 5*^ and 

 6^^ Short, 5*^ widened distally. Peraeopods 3—5 (Fig. 35) with 2^ 4^'^ 

 and 5*^ joints much expanded and carrying many spines and setae. Finger 

 wanting in all peraeopods. Pleopods weak. Uropod 1 strong, spinöse; nropod 2 

 smaller, setose; uropod 3, outer ramus 2-jointed, longer than inner, setose 

 at tip. Telson short, much broader than long, not tapering, a little incised. 



1 species. 



1. H. arenarius (Slabber) 1769 Onisciis a., 0. arenaüus. Slabber, Nutuurk. 

 Verlustig., p. 92 t. 11 f. 3, 4 | 1775 Haustorius arenarius^ St. Müller in: Slabber, Phys. 

 Belustig., p.48;i891 H.a., G. 0. Sars, Criist. Xorway, r. 1 p. 135 t. 46 11893 H.a., 

 A.DellaYalle in: F. Fl. Xeapel, t\20 p.750 t.60 f. 22, 23 | 1825 Oniscus a., Pterygoceriis, 

 Latreille in: Enc. meth., v. 10 p. 236 j 1829 0. a., Pterygocera, Latreille in: G. Cuvier, 

 Kögne an., n. ed. u4 p. 124 | 1878 P. arenaria, Bovalliiis in: Bih. Svenska Ak., ».4 nr. 8 

 p.l t.l— 4 I 1851 Belliaa., Bäte in: Ann. nat. Hist., ser.2 r.7 p.318 1. 11 f. 1—8 | 1854 

 Sulcator arenarius., Bäte in: Ann. nat. Hist., ser.2 r. 13 p. 504 | 1871 S. arenatius, 

 A. Boeck in: Forh. Selsk. Christian., 1870 p. 137 | 1818 LepidactyUs dytiscus, Say in: 

 J. Ao. Philad., i?. In p. 380. 



Pleon Segment 3 much larger than 1*^*^ or 2*^, angles rounded, setose. Eyes 

 small, imperfectly developed, light-coloured. Antenna 1 (Fig. 32), flagellum 

 9-jointed, accessory flagellum 5-jointed. Antenna 2 (Fig. 33) little longer 

 than antenna 1, flagellum 10-jointed. Gnathopod 2 more slender than gnatho- 

 pod 1, i)^^ Joint much shorter than 5*^^ In peraeopod 4 (Fig. 35), 4**^ Joint 

 much larger than in the other pairs, longer than broad. In peraeopod 5 

 4^'^ Joint much broader than long. Telson twice as broad as long, cleft 

 not reaching the middle, each lobe with an apical tuft of spinules and 2 

 lateral spinules. Colour paler than sand. L. 9 11 mm. 



Burrows with great dexterity in wet sand. AVill live long in suitable confinement. 

 North- Atlantic (Holland, France and Britaiu. Xorth-Aiuerica); Kattegat. 



4. Gen. Cardenio Stebb. 



1888 Cardenio (Sp. un.: C.paurodadylus). T. Stebbiug in: E.ep. V^oy. Challenger, 

 i:29 p.806 | 1893 C, A. Della Valle in: F. FL Neapel, i-.20 p. 749 | 1890 Cardenis, 

 Warburton in: Zool. Rec, u 25 Crust. p. 18. 



Head somewhat produced. Side-plate 1 very small, 4*^^ broader than 

 deep, scarcely excavate. Antenna 1 shorter than antenna 2, accessory 

 flagellum small, with 2 joints, 2*^ minute. Mandible short, strong, cutting edge 

 quadri-dentate, accessory plate rather stronger on left than on right mandible, 

 left with 3, right with 2 spines in spine-row, molar strong, palp broad, 

 3'^ Joint much shorter than 2^. Maxilla 1, 12 setae on inner plate, 9 spines 

 on outer, several spinules and setules on 2*^ Joint of palp. Maxilla 2, both 

 plates broad, inner with lateral as well as apical armature. Maxillipeds, 

 inner plates moderate, outer fringed with spinules, nearly reaching apex of 

 palp's long 2^ Joint; 1^* of palp very short, 4*'^ rudimentary or wanting. 

 Gnathopods resembling those of Synopia. Gnathopod 1, 5*'^ Joint broad 

 and long, (3*^^^ naiTower, only half as long, both Mnged with spines and 

 setae, finger rudimentary. Gnathopod 2, 2*i, 5*^ and 6*'^ joints long and 

 slender, 6^^ more than half as long as 5*^, capable of closing against it; 

 both carrying long setae, finger wanting. Peraeopods 1 — 5, 4*^ Joint widened. 



