302 



met with this species in several places, both on the south and west coasts of 

 Norway, and northwards even to Vadso. It is a true deep-water form, only 

 occurring in depths ranging from 50 to 200 fathoms. 

 Distrihittion. — Kattegat (Meinert). 



10. Monoculodes falcatus, G. 0. Sars, n. sp. 



(PI. 107, fig. 2). 



Form of body nearly as in M. norvegicus. Cephalon exceeding in length 

 the 3 anterior segments of mesosome combined, and produced to a very large 

 and curved rostrum, reaching considerably beyond the basal joint of the su- 

 ])erior antennae, dorsal contour of cephalon forming a perfectly even and 

 uninterrupted curve until the tip of the rostrum. First pair of coxal plates 

 considerably expanded distally; 4th pair comparatively broader than in M. 

 norvcgiCHK, with the infero-posteal corners but little produced Eyes of normal 

 appearance, rather large, rounded oval in form, pigment bright red. Superior 

 antennae exceeding the length of the cephalon and the 3 anterior segments of 

 mesosome combined, 1st joint of the peduncle fully as long as the other 2 

 taken together, flagellum longer than the peduncle, and composed of about 

 13 articulations. Inferior antennae but little longer than the superior, last 

 joint of the peduncle shorter than the penultimate one, flagellum about the 

 length of those joints combined. Anterior gnathopoda rather feeble, propodos 

 narrow oblong and somewhat curved, more than twice as long as it is broad, 

 with the palm shorter than the hind margin, carpal lobe considerably smaller 

 than in M. norregicu^: and not extending to the palm of the propodos. Po- 

 sterior gnathopoda vei-y slender, propodos narrow sublinear, more than 4 times 

 as long as it is broad, carpal process not nearly extending to the palm of 

 the propodos. Pereiopoda somewhat less slender than in M. norvegicus, carpal 

 joint of the 2 anterior pairs slightly expanded, dactylus comparatively shorter. 

 Last pair of pereiopoda nearly as in that species. Telson oblong quadran- 

 gular, terminal edge distinctly insinuated. Body of a more or less dark 

 orange colour, but without any pigmentary markings. Length of adult 

 female reaching 10 mm. 



liemarJcti. — I have formerly confounded this form with M. norvegicus, 

 which species, indeed, is its nearest ally. On closer examination it maj^, however, 

 easily be distinguished by the very large and evenly curved rostrum, the less 

 slender form of the pereiopoda, and especially by the very diiferent colouring 

 of the body. It also grows to a much larger size than that species. 



Occurrence. — Oif the west coast of Norway this form is not rarely 



