82 CRUSTACEA MALACOSTRACA. III. 



and especially on the posterior sternites are long and slender in M. longiremis; the female operculum, 

 which is from somewhat less than to fully twice as long as broad, reaches to the insertion of the 

 nropods, thus to rather near the end of the abdomen, and its posterior end (fig. 5 a) is somewhat broader 

 than in allied forms. The setae and spines on the upper side of fourth joint of third pair of legs are 

 characteristic as to length, and several among them are bifid at the end (comp. the figure of Sars) and 

 differ from those in M. subinermis. 



A single mutilated female from our area agrees completely in ail essential features with spec- 

 imens from Skager Rak. 



Occurrence. Not taken by the "Ingolf". But it has been gathered by the "Thor" at a 

 single locality. 



West of Iceland: Lat. 63°46' N., Long. 22°56' W., 79 fath.; 1 spec. 



Distribution. Off the Skaw in Skager Rak, 125 fath. (Meinert). 



51. Macrostylis longipes n. sp. 

 (PI. VII, figs. 6 a— 6 g). 



Male. Slender, about five times as long as broad. -- Head of the usual shape. — Antennulae 

 nearly as long as the head, somewhat robust, 5-jointed; first and second joint subcylindrical, subequal 

 in length, together a little longer than the remainder of the appendage (fig. 6 b), and each about twice 

 as long as deep; third joint short, thicker towards the end, scarcely as long as the fourth, which is 

 thicker and has a transverse row of long sensory filaments a little from the end; fifth joint consider- 

 ably longer than the fourth, somewhat clavate and with a number of long sensory filaments near the 

 end. — (Antennae lost, excepting the three small and slender proximal joints). — Maxillipeds with their 

 distal joints as in M. subinermis. 



Thorax slender. The three anterior segments combined slightly longer than broad. Fourth 

 segment a little narrower than the third, short, two and a half times as broad as long, with the postero- 

 lateral angles broadly rounded. The three posterior segments subequal in length, equal in breadth, 

 and slightly narrower than fourth segment; their postero-lateral part at each side (fig. 6 f) produced 

 conspicuously backwards and a little outwards, distally rounded, and seen from above the posterior 

 part of the coxae is perceived at their ends, but spines seem to be wanting; seventh segment scarcely one- 

 third as broad again as long. First segment has a strong and somewhat long, acute ventral process 

 directed mainly downwards (fig. 6 a); sixth segment with a broad, low, acute process, while the process 

 on seventh segment is slender, somewhat long, acute and directed downwards and a little backwards. 



The three anterior pairs of legs of usual length and shape. Third pair (figs. 6 c) somewhat 

 slender; the spine on third joint somewhat long and straight; most of the setae or spines on the two 

 following joints of middle length and scarcely bifid at the end. Fourth pair, as usual, shorter than 

 the third, not one-third as long as the animal; the four posterior pairs increase gradually in length 

 backwards, but so much that sixth pair are a little longer than all thoracic segments combined, and 

 seventh pair nearly half as long again as the entire animal, thus showing a quite anomalous devel- 

 opment. Sixth pair (fig. 6d) slender in proportion to their length; fifth joint is almost three times, 



