— 12 — 



Thysanopoda bidentata, G. O. Sars, Christiania Vidensk. 

 Selsk. Forh. 1882, n° 18, p. 5o, Pl. 1, fîgs. 11-14. 



Description. — The rostrum is well developed, very nar- 

 rowly triangular, and generally rather long, longer than the 

 eye-stalks, while the front part of the carapace behind the ro- 

 strum is a very short triangle, covering at most only the base of 

 the eye-stalks. The leaflet on the upper end of first antennular 

 joint is rather large, broader than high, and directed obliquely 

 upwards and forwards; its distal margin is straight or slightly 

 convex, deeply pectinate, with 6 to 8 very slender, setiform 

 denticles; the outer angle of the leaflet is produced into an 

 oblique narrow process with about three similar setiform den- 

 ticles. Even in very small spécimens, measuring scarcely 6 mm 

 in length, the margin of the leaflet has some few of thèse cha- 

 racteristic setiform denticles. Upper distal end of second anten- 

 nular joint has on each angle an obliquely conical tubercle which 

 generally is very conspicuous in large, feebly developed in small, 

 spécimens. — Length of large spécimens from the Mediterranean 

 and of one single spécimen from stat. 1 63g, 19.5 mm; other 

 large Atlantic spécimens taken in 1 904 measure scarcely 1 6 mm. 



Localities. — Stat. 1639, 35 spécimens; stat. 1675, 1 spé- 

 cimen; stat. 1676,6 spécimens; stat. 1 7 1 5 , 5 spécimens; stat. 

 1736, 1 spécimen; stat. 1749, 1 spécimen; stat. 1768, 33 spéci- 

 mens; stat. 1834, 4°7 spécimens; stat. 1844, 9 spécimens; stat. 

 1849, I0 ^ spécimens; stat. i85i, 70 spécimens; stat. 1 856, 16 

 spécimens; stat. 1869, 32 spécimens; stat. 1874, 24 spécimens. 



Distribution. — The Copenhagen Muséum possesses a large 

 number of spécimens from 24 localities nearly uniformly dis- 

 tributed in the Atlantic between lat. 46 0 23' N. and 21 0 40' S. 

 But the species goes considerably further northwards, as a 

 spécimen has been taken by Sars in about lat. 63 1/2 0 N. near 

 the Norwegian coast. I have captured it in the harbour of 

 Messina, and it is common in the western half of the Mediter- 

 ranean (material from Monaco). In ail probability the species 

 inhabits only the Atlantic; besides it has not been found south 

 of lat. 2i° 40' S., though the Copenhagen Muséum possesses 

 several other species from a good number of localities in the 

 Atlantic between lat. 22 0 S. and lat. 38° S. 



