116 Haploops 



3. Gen. Haploops Lilj. 



1855 Haploops. W . Liljeborg in: Öfv. Ak. Förh., r. 12 p. 135 , 1891 H., G. 0. 

 Sars, Crust. Norvvay, r.l p. 191 | 1893 H., A. Della Valle in: F. Fl. Neapel, v. 20 p. 111, 

 126, 485 I 1894 ü., T. Stebbing in: Bijdr. Dierk., r. 17 j). 18. 



Head with postero-antennal cornevs rounded oif. Side-plate 1 deeper 

 than next pair, partly concealiüg base of autenna 2; 4*^ evenly curved 

 below the prominent posterior angle. f]yes less perfect than in the otlier 

 genera, corneal lenses 4 or 2 or noue. Mandibular palp (Fig. 28) setose, 

 with elongate 3*^ Joint. Peraeopods 3 and 4, 2*^ Joint rather broad, its front 

 edge moderately curved, S^'i carryiug several transverse rows of spines. 

 Peraeopod 5 (Fig. 29), 2^^^ Joint squarely dilated above, so that the front 

 and bind margin are subparallel, while the descending lobe is narrowly or 

 bi'oadly rounded, its margin fringed with setae, of which there are many 

 also on the bind margin and surface of the expansion; 3*^ Joint shorter than 4*^\ 

 4*^' and 5^^^ broad, 6*^* very naiTow, 7*^^ spiniform. üropod 3 reaching conside- 

 rably beyond the others, rami foliaceous, setose at the edges, inner margin of 

 inner ramus armed with strong spines. Telson of moderate size, usually 

 deeply cleft. One pair of hepato-pancreatic caeca (Della Valle). 



5 species. 



Synopsis of species: 



j Body smootli or nearly so, corneal lenses present — 2. 

 1 \ Body with dorsal fascicles of setae, corneal lenses 

 I absent — 4. 

 Antenna 1 very long; uropod 1, inner ramus very 



short 1. H. dellavallei . p. 116 



2 



j Antenna 1 not very long; uropod 1, inner ramus 



not very short — 3. 

 . Corneal lenses 2; uropod 3 in $ , rami subequal, 



) setose 2. H. tubicola . . . p. 117 



j Corneal lenses 4; uropod 3 in $ , rami unequal, 



' smooth 3. H. laevis .... p. 117 



J Telson cleft a little beyond the middle 4. H. setosa . . . p. 117 



\ Telson cleft nearly to the base 5. H. robusta . . . p. 118 



1. H. dellavallei Stebb.*) 1893 H. tuUcola (err., non W. Liljeborg 1855!), 

 A. Della Valle in: F. Fl. Neapel, ^).20 p.486 t. 3 f. 2; t. 37 f. 1—18. 



Corneal lenses 4, colour of eyes erimson, standing out on a gTound 

 of bright yellow. Antenna 1 much longer than the body, flagellum 7 times 

 as long as peduncle, of about 30 joiuts with very long setae. Antenna 2 

 subequal to autenna 1, ultimate Joint of peduncle a little longer than penultimate. 

 fliigellum as in antenna 1. Peraeopod 5, 2*^ Joint rather naiTOW, broadest 

 at base, bind margin concave, lower lobe naiTOw, scarcely reaching beyond 

 the Short 3*^, 4*^ and 5*^ equal, 5^^ with both margins crenate, 6**^ and 7*'^ 

 very small. Uropod 1 perfectly smooth, inner ramus spine-like, ^^ length 

 of outer; uropod 2 furnished with spines; uropod 3 with the rami subequal 

 and foliaceous, armed with spinules and setules. Telson heart-shaped, cleft 

 almost to the base, with a setule on each side of the almost acute apex. 

 (Jolour pearl-grey, changing into yellow-brown on the sides; a large erimson 

 blotch occupies part of the head and peraeon segnicnt 1. L. 8 mm. 



Gulf of Naples. Depth 20—40 m. 



*) Spec. nov. After Antonio Della Valle. 



