gQ CRUSTACEA MALACOSTRACA. III. 



as long as broad, tapering much from before the middle to the moderately narrow, rounded end placed 

 between the anterior ends of the insertions of the uropods, thns leaving a moderate part of the ventral 

 excavation uncovered; the anal doors placed near the end of the abdomen. — Both uropods are 

 mutilated; of the right uropod only the basal joint, which is slightly longer than the breadth of ab- 

 domen and moderately strong, has been preserved; the left uropod (fig. 3 a) is extremely long, not 

 much less than three-fourths as long as the animal, though its terminal part has been lost; the portion 

 beyond the basal joint is many-jointed and extremely thin, excepting its first joint, which is a little 

 thicker and much longer than the others, and each of these joints has at the end a fine, but distinct hair. 



Length of the specimen 2-5 mm. 



Remarks. M. elongata differs from the forms described above in the shape of the body, very 

 short antemue, some features in the legs, and the extremely long uropods. From the three following- 

 species it is instantly distinguished in having the abdomen much produced backwards behind the 

 uropods, and by various other features. 



Occurrence. Taken by the "lngolf at a single station. 



South of Iceland: Stat. 40: Lat. 62°oo' N., Long. 2i°36' W., 845 fath., temp. 3-3°; 1 spec. 



49. Macrostylis subinermis n. sp. 

 (PI. VII, figs. 4 a— 4 h). 



Female. Bod}' about four times as long as broad, and, as to general aspect, in the main as 

 in M. longiremis Mein. — Head somewhat long (fig. 4 a). — Antennulse moderately short, 5-jointed 

 (fig. 4 b); first joint longer than the two following joints combined and more than twice as long as 

 thick; fifth joint small and thin, with a single sensory filament. — Antennas not fully reaching the 

 posterior angles of third thoracic segment; penultimate joint of the peduncle (fig. 4 b) long, and consider- 

 ably longer than the terminal joint; flagellum about as long as the peduncle, 8-jointed. — Maxillipeds 

 (fig. 4 c) with the two distal joints considerably larger than in M. sfiinifera. 



Thoracic segments (fig. 4 a) of the usual shape; fourth segment only a little narrower than the 

 third, somewhat broader than the fifth, and nearly more than two and a half times as broad as long; 

 seventh segment nearly as broad as the sixth and twice as broad as long; each of the three posterior 

 segments have their postero-lateral parts a little produced, with a small spine on the angle (figs. 4 a 

 and 4f). The first sternite has a small or minute process; the three following sternites are unarmed 

 in specimens without marsupium, while the three -- in ovigerous females only the two — posterior 

 sternites have a small process, which sometimes has disappeared. 



The thoracic legs somewhat similar to those in M. longiremis Mein., but more slender. Third 

 pair (fig. 4 c!) with the upper spine on third joint straight; most of the setae on the two following 

 joints somewhat long, robust, partly spiniform, but the branch near the end feeble or wanting. Sixth 

 pair (fig. 4 e) with fourth joint only half as long as the fifth, but almost as long as the sixth; seventh 

 joint considerably less than half as long as the sixth, about as long as the claw. Seventh pair about 

 as long as the sixth; second joint with a close row of setae along the posterior margin and a smaller 

 number of setae along the opposite margin. 



