388 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



rior portion of the abdomen is rounded with a median excavation or 

 notch at the extremity. 



The legs are more or less similar in structure. 



SYNIDOTEA NODULOSA (Kr^yer). 



Idotea nodulosa Kr0yer, Naturhistorisk Tidsskrift (2). II, 1846, p. 100; Voy. en 

 Scand., Crust., 1849, pi. xxvi, flg. 2. — Reinhardt, Gronlands Krebsdyr, 

 1857, p. 34. — LuTKEN, Crust., Greenland, 1875, p. 150. 

 Synidotea nodidosa Harger, Am. Jour. Sci. (3), XV, 1878, p. 374; Proc. IT. S. 

 Nat. Mus., II, 1879, p. 160; Report U. S. Commissioner of Fish and Fisher- 

 ies, 1880, Pt. 6, pp. 351-352; pi. vi, figs. 33-35.— S. I. Smith, Report of 

 Progress of the Geological Survey of Canada, 1880, p. 218. 

 Edotea nodulosa Miers, Journ. Linn. Soc. London, Zool., XVI, 1883, p. 67. — 



Hansen, Videnskabelige Meddelelser fraden natur- 

 historiske Forening i Kjgbenhavn, 1887-88, p. 188. 

 Synidotea nodulosa Benedict, Proc. Acad. Nat. Sci. 

 Phila., 1897, pp. 398-399.— Richardson, American 

 Naturalist, XXXIV, 1900, p. 228; Proc. U. S. Nat. 

 Mus., XXIII, 1901, pp. 541-542.— Ohlin, Bihang 

 till K. Sv. Vet.-Akad. Handl., XXVI, Afd. iv, 

 1901, No. 12, p. 29. 



Fig. 429.— Synidotea nodu- 

 losa (After Harger). 

 X 4. 



Localities. — Southern Greenland; Middle 

 Ground; latitude 66'-^ 46' north, longitude 54° 10' 

 west; Halifax; Georges Banks; Arctic Seas and 

 southward on Pacific coast as far as British Co- 

 luni])ia; Jugor Schar (Hansen); Recherche Bay, 

 between Reindeer Point and Fox Glacier, West 

 Spitzbergen (Ohlin). 



Dej>tli.—'6 to 111 fathoms (Smith). In stones, 

 sand, and alga\ 



Ohlin'^' says of the color: "It is a uniform dark olive-green, some- 

 times on the epimeres with a trace of purplish spots." 



Bod}^ oblong-ovate, a little over twice as long as wide, 3i mm.: 7i 

 mm. 



Head wider than long, \\ mm.:2i mm., with the anterior margin 

 slightly excavate. The eyes are small, round, composite, and situated 

 close to the lateral margin. In front of each eye and arising from 

 the anterior margin is a conspicuous tubercle. In the median line 

 on the anterior part of the head are two low tubercles in longitudinal 

 series, the second one being slightly larger than the first. On either 

 side of this longitudinal row is a small low tubercle. Back of this 

 arrangement of tubercles are two low elevations, one on either side of 

 the median line. Posterior to these elevations is a low ridge. The 

 hrst pair of anteniKe liave the first two articles short and subcqual; the 

 third is one and a half times longer than the second; the fourth is 



« Bihang till K. Sv. Vet.-Akad. Handl., XXVI, Afd. iv, 1901, No. 12, p. 29. 



