262 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



interiorly than exteriorly, about half again as broad as long in the median line; the fifth 

 brachial is slightly wedge-shaped, about twice as broad as long in the median line, the 

 following becoming more obliquely wedge-shaped, and after the second syzygy triangu- 

 lar, about as long as broad, soon becoming somewhat less oblique and wedge-shaped 

 again and very slowly increasing in length, being very long terminally. 



Syzygies occur between brachials 3+4, 9 + 10, 14+15 and distally at intervals 

 of three muscular articulations. 



P! is from 11 to 13 mm. long with 17 or 18 segments of which the first is about 

 as long as broad and the remainder are about twice as long as broad, becoming some- 

 what longer distally; the pinnule is much stouter than those succeeding and tapers 

 very gradually to the tip; it is not so slender distally as the corresponding pinnule in 

 A. bifida; the third and following segments have the distal outer edge produced and 

 finely spinous, this feature gradually increasing in intensity and becoming prominent 

 in the outer half of the pinnule. P 2 is from 7 to 8 mm. long with 12 segments, the first 

 about twice as broad as long, the second about as long as broad, the remainder about 

 twice as long as broad, becoming terminally about three tunes as long as broad; the 

 third and following develop projecting and spinous distal outer edges which are quite 

 prominent. P 3 and the following pinnules are similar to P 2 . The distal pinnules 

 are from 10 to 12 mm. long, exceedingly slender, with about 20 segments, the first 

 longer than broad, the remainder greatly elongated with swollen articulations. 



Remarks [by A.M.C.]. There has been some controversy as to the rank of adriatica. 

 Koehler (1927) regarded it as a form of A. mediterranea but Tortonese (1952), on second 

 thought, maintains that it is a distinct species.* Since the larger number of cirrus 

 segments does occur, though rarely, outside the Adriatic, this character is not absolutely 

 diagnostic and I am inclined to consider adriatica as a subspecies of mediterranea. 



Localities. Adriatic Sea [Olivi, 1792] (several, G.M.). Entire east coast of the 

 Adriatic, 18-73 meters [Heller, 1868]. 



Trieste (Triest) [Heusinger, 1833; Leuckart, 1833; Grube, 1840, 1864; J. Miiller, 

 1849; M. Sars, 1857; Heller, 1868; Stossish, 1876, 1883; Ludwig, 1879; Carus, 1884; 

 Jickeli, 1884; Rosoll, 1888; Hamann, 1889; Seeliger, 1892; Konig, 1894; Grieg, 1904; 

 E. Graeffe, 1905; Sterzinger, 1907; A. H. Clark, 1912; Hartmeyer, 1916; Tortonese, 

 1952, 1956] (102+ U.S.N.M., 35685, 35686, M.C.Z., 243; C.M.; B.M.; G.M.; Berg. 

 M.; Berl. M.; 3033, 4342; V.M., 812, 813, 815; Tortonese collection). Type locality. 



Rovigno [A. H. Clark, 1912; Vatova, 1928, 1950]. Same, 23-28 meters [Zimmer- 

 rnann, 1906]. 



Neresine [Stossish, 1876, 1883; Ludwig, 1879]. Same, 17 meters [Grube, 1864]. 



Narenta channel [Zei, 1942]. 



Crivizza [Stossish, 1876, 1883; Ludwig, 1879]. Same, 8 meters [Grube, 1864] 

 and 55 meters [Grube, 1864; Carus, 1884]. 



Fiume [Kolosvary, 1937]. 



Zaole [Ludwig, 1879; Carus, 1884]. 



Martinsica (Martinschizza) [Stossish, 1876, 1883; Ludwig, 1879; Carus, 1884]. 



Quarnero [Grube, 1861; Heller, 1868]. 



Veglia, 37-55 meters [Faber, 1883], 



Near Ossero (island of Cherso), 37-53 meters [Grube, 1864]. 



Island of Lussin (Lossmi). Lussin, 37-55 meters [Faber, 1883]. Lussingrande 



*See Addenda (p. 838) under 1965. 



