24 



CRUSTACEA MALACOSTRACA. III. 



first joint of the leg and, seen from above, well marked off by a transverse sutnre. It may be added 

 that the lateral lobes of the segments are a little longer, more produced, in my older specimens than 

 in the large female figured by Sars. 



The median lamella of the male operculum (figs. 6 d — 6 e) tapers, as said above, from the 

 moderately broad base to near the slightly widened end. Each of its pleopods terminates in an inner, 

 distally rounded lobe about as long as broad and an outer somewhat shorter, almost spiniform, acute 

 process directed backwards and a little outwards. — The copulatory organ of each lateral part of the 

 operculum is produced into a thin, long thread reaching nearly to the end of the peduncle of the 

 uropods. The female operculum has been figured by Sars. 



According to Sars his large female was 12 mm. long; my largest specimen, a male, is 8-4111111. 



- The specimens from the "Iugolf" Stat. 25 are very young, without seventh pair of legs, and they 



measure only 2— 2'i mm. in length. They differ from developed specimens in having no dorsal tubercles 



on the thoracic segments, and besides their fifth and sixth segments have the anterior of the lateral 



lobes still undeveloped, being represented by a feeble angle. 



Occurrence. Taken by the "Ingolf" at two stations. 



Davis Strait: Stat. 25: Lat. 63°3o' N., Long. 54°25' W., 582 fath., temp. 3-3°; 27 young. 



Between Angmagsalik and North-West Iceland: Stat. 95: Lat. 65°i4' N., Long. 30°39' W., 752 fath., 



temp. 2'i°; 1 spec. 



The species has been recorded from Davis Strait: Lat. 63°24' N., Long. 53° 10' W., 473 fath. 

 (Stephensen). And the "Thor" has captured it south-west of the Fseroes: Lat. 6i°i5' N., Long. 9°35' W. 

 4 6 3— 5 X 5 f ath., 1 spec. 



Distribution. Hitherto only recorded from a single station in the sea west of Lofoten, 457 

 fath., temp. -f- 07° (G. O. Sars). 



Ianirella Bonnier. 



Description. As to the shape of the body intermediate between Iauira and Pletirogouiiuii, 

 but somewhat more similar to the latter genus. Head with a rostral process and a pair of long lateral 

 processes (PI. I, fig. 8 a). Eyes almost rudimentary or wanting. Antennulse with the peduncular joints 

 well developed and a low number of joints in the flagellum. Antennse in the main as in Ianira; 

 squama distinct. -- Mandibles (fig. 8 c), maxillulse, and maxillae almost as in Ianira; maxillipeds (fig. 8d) 

 somewhat shorter with second joint broader, fourth joint (second joint of the palp) at most as broad 

 as the lobe from second joint. 



Thoracic segments produced into lateral processes or lobes. First pair of legs (fig. 8 e) prehensile, 

 and especially third to fifth joints much thicker than in the following pairs; fifth joint with spines 

 along its prehensile margin; sixth joint about half as long as the fifth and moderately strong; seventh 

 joint conspicuously longer than in Ianira, with the claw somewhat slender and the accessory claw very 

 small. The other legs somewhat slender and moderately long; claw and accessory claw nearly as in 

 first pair. 



Abdomen with lateral processes, and behind the uropods considerably produced as a triangular 



