369 



broad at the base, and gradually tapering distally, tip with a short and 

 narrow sinus. Colour a magnificent coral-red, somewhat more intense at the 

 posterior edges of the segments. Length of a nearly adiilt specimen 24 mm. 

 Maximum length of arctic specimens reaching 40 mm. 



Bcmarls. — The present species was detected in the j-ear 1878 during 

 the 3rd cruise of the Norwegian North Atlantic Expedition. It is undoubtedly 

 identical with the form at first recorded by Whiteaves and Verrill as £))mmi?)7« 

 rornigera, and by the Rev. Mr. Stebbing as i". conspicua. From the other species 

 is is easily distinguishable both by its large size, and by several well-mai'ked 

 structural details, for instance by the much more strongly developed dorsal 

 carina, the numerous obtuse lateral tubercles, and the greatly prolonged rostrum ; 

 moreover the gnathopoda are comparativel}' more strongly built than usual. 



Occurrence. — The only place on the Norwegian coast, where I have 

 met with this species, is at Hasvig, west Finmark, where a few apparently not 

 yet fully adult specimens were collected from a depth of 100 to 150 fathoms. 



I)i>>trihntion. — OtF the south and west coasts of Spitsbergen (Norw. 

 North. Atl. Exped.), Atlantic coast of North America (Sidn. Smith, Stebbing), 

 Greenland (Hansen). 



Gren. 2. Acanthozone, Boeck, 1870. 



Syn. : Acanthosoma, Owen. 



Body densely spinous, spines arranged in longitudinal rows both 

 along the back and sides. Cephalon with a very small rostral projection, 

 postantennal corners spiniform. Coxal plates comparatively small, but rigid 

 and projecting laterally, each terminating with one or more acute lappets, 

 4th and 5th pairs not very different from the others. Eyes well developed 

 and rather prominent. Antennse very slender and elongated, especially the 

 inferior ones. Anterior and posterior lips about as in Epimeria- Mandibles 

 very strong, with the cutting edge bluntly dentated and the molar expansion 

 very thick, palp large. First pair of maxillae nearly as in Epimeria; 2nd 

 pair with the lobes comparatively narrower, and about of equal length. Maxil 

 lipeds scarcely differing from those in Epimeria. Gnathopoda rather feeble 

 in structure, having the propodos elongated and narrow. Pereiopoda com- 

 parativel}' strongly built, the 3 posterior pairs of same structure, and succes- 

 sively increasing in length, basal joint moderately expanded, and having the 

 posterior edge divided into acute lappets. Last pair of uropoda with the rami 

 sube<|ual and lanceolate in form. Telson rather elongated, with the apex entire 



