310 



rostrum, and by the much more powerful structure of the gnathopoda, as 

 also by the form of the telson. 



Occurrence. — Boeck detected this form in the Christianiafjord, which, 

 as yet, is the only place on the coast of Norway, where the species has 

 been observed. 



Distribution. — Stat. 40, 48 and 240 of the Norwegian North Atlantic 

 Expedition. 



Gen. 4. MODOCUlopsis, G. 0. Sars, n. 



Syn: Monoculodes, Boeck (])art ) 



Form of body about as in 31o)ioailodes. Cephalon but very little pro- 

 duced in front, rostrum short and obtuse. Fourth and 5th pairs of coxal 

 plates (in female) very large. Eyes confluent, placed within the front above the 

 bases of the superior antennae. The latter (in female) longer than the inferior, 

 last joint of the peduncle unusually elongated, flagellum short. Oral parts 

 about as in Monoo (lodes, except that the mandibular palp is somewhat smal- 

 ler, with the terminal joint shorter than the middle one. Anterior gnathopoda 

 with tlie carpal lobe very large and projecting; posterior ones extremely 

 slender, with the propodos much elongated and tapering distally, and the 

 carpal process slender and produced. The 4 anterior pairs of pereiopoda 

 comparatively short and stout, and densely setous; last pair of the usual 

 slender form. Uropoda and telson about as in Monoculodes. 



Remarlcs. — I have felt justified in establishing this new genus in order 

 to include the rather anomalous form described by Boeck as Monuculodes 

 lomjicornitt. The genus is chiefly characterised by the very slightly produced 

 frontal ])art of the cephalon, by the superior antennae in female being longer 

 than the inferior, and having the 3rd joint of the peduncle unusually elon- 

 gated, and finally by the peculiar structure of the posterior gnathopoda. In 

 some of these characteristics it approaches the following genus, Periocidodes, 

 from which it however differs in the structure of the eyes, the mandibles 

 and the gnathopoda. It comprises as yet but a single species, to be 

 described in the sequel. 



