134 



found to differ by a somewliat more roljust form of body, l)y the dark pigment 

 of the eyes and especially hy the coarse structure of the 2 posterior pairs of 

 pereiopoda. It also wholly wants the 2 small dorsal spines on the 1st seg- 

 ment of the nrosome, present in most other species. 



Occurrence. — The species has not yet been observed oft the coast 

 of Norway and is only described here in order to show its relation to the 

 other species. The figures here given have been drawn from specimens in 

 the Stockliolm Museum. It was tirst detected by Mr. Lindstrom in the Baltic 

 oif Gotland and has subsequently been found in several other localities both 

 of the Baltic and the Kattegat, in depths varying from 2 to 40 fathoms. The 

 extrascandinavian distribution of the species is very questionable, as it has 

 been generally confounded with other allied species. 



Gen. 4. HaUStoriuS, Statins Mitller, 1775. 

 yyn: Lepidact.ylis, Say. 

 » Pterygocera, Latreille. 

 > Bellia, Sp. Bate. 

 » Sulcator, Sp. Bate. 



Body short and robust, with rather large coxal plates, the 3 anterior 

 pairs of which are curved and obtusely pointed at the tip. Ceplialon depres- 

 sed and produced in front to a sliort rostral projection. Metasome poorly 

 developed, with small epimeral plates. Urosome generally folded lieneath the 

 metasome. Superior antennae with the joints of the peduncle sharply defined 

 and densely setous, accessory appendage well developed. Inferior antennae 

 longer than the superior, penultimate joint of the peduncle laminarly expan- 

 ded and fringed posteriorly with long ciliated setae. Mandibles of usual 

 structure, palp rather large. First pair of maxillae with a densely ciliated 

 flap-shaped expansion outside the basal part, masticatory lobe transversely 

 truncated at the tip, basal lobe not very large, palp well developed with the 

 terminal joint curved, and provided with tufts of slender bristles. Second 

 pair of maxillae largely developed, outer lobe forming a thin semilunar la- 

 mella finely ciliated on the outer edge and fringed along the inner edge with 

 a dense series of very delicate setae, inner lobe much shorter than the outer, 

 and having outside a sigmoid, setous ridge. Maxillipeds of moderate size, 

 basal and masticatory lobes nearly equal in size, and setous on the inner edge, 

 palp rather large, with the 2nd joint i)roduced at the end interiorly to a 

 rounded lobe, and having, on the inner side, several transverse rows of very 

 delicate bristles, third joint securiform, bent, in the middle, at a right angle, 



