690 FBOCEEDINGS OF THE NATIONAL MUSEUM. vol.xxh. 



UNIO ELLIPSOIDEUS Locard. 



* Unto ellipsoideits Lucaud, Arch. Mus. Lyon., Ill, 1883, p. 211, pi. xxi, tigs. 1-3.' — 



*Westerlund, Fauu. Pal., II, Pt. 7, 1890, p. 171.- — * P^etel, Couch. Sairi., 

 Ill, 1890, p. 151. 



* Unio (jenezaretliensis Locard, Arcli. Mus. Lyou., Ill, 1883, p. 213, pi. xxi, figs. 



4-6. — ''PyETEL, Couch. Sam., Ill, 1890, p. 153. — *Westerlund, Fauu. Pal., 

 II, Pt. 7, 1890, p. 172. 



* Urriu jauherti Locard, Arch. Mus. Lyou., Ill, 1883, p. 248, pi. xxii, ligs. 8-10. — 



'"PiETEL, Couch. Sam., Ill, 1890, p. 155.— *Westerlund, Faun. Pal., II, Pt. 

 .7, 1890, p. 176. 



* Unio sabuloniciis Kobklt, Icon., new ser., VI, 1893, p. 96, pi. clxxix, fig. 1129. 

 "Unio lortiti Kobelt, Icon., 1st sup., 1895, p. 14, pi. y, fig. 3. 



" Unio Jcohelli Eolle, Icon., 1st sup., 1895, p. 15, pi. vi. fig. 3. 



^Unio pietri Kobelt (part), Icon., 1st sup., 1895, p. 16, pi. vi, figs. 1, 2. 



'^Unio herodes Kobelt, Icon., Ist sup., 1895, p. 17, pi. vi, fig. 4. 



Lake Tiberias. 



tUNIO DELICATUS Lea.^ 



* Unio delieaius Lea, Pr. Acad. N. Sci. Phila., VII, 1863, p. 189.— Ml. Acad. N. Sci. 



Phila., VI, 1866, p. 58, pi. xix, fig. 56.— *Obs., XI, 1867, p. 62, pi. xix, fig. 

 56.— * Westerlund, Fauu. Pal., II, Pt. 7, 1890, p. 178.— *P^tel, Conch. 

 Sam., Ill, 1890, p. 150. 

 *Mar[/aron ( Unio) delicatus Lea, Syn., 1870, p. 42. 



Oroutes River, Syria. 



(Group of U7iio littoralis.) 



Shell rather solid, subinllated, rouiided rhomboid, with a faiut pos- 

 terior ridge, usually slightly biaugulate behiud aud often becoming 

 arcuate when old; beaks prominent aud full; beak sculpture cousistiug 

 of numerous rather line, subparallel ridges or corrugations which are 

 sometimes a good deal broken up, and which extend well out on the 

 disk, but begin at the beaks as normal, somewhat coarse Unio sculpture, 

 sometimes with flue radial lines posteriorly; pseudocardinals rather 

 solid, subcompressed, smooth below; laterals straight or slightly curved; 

 cavity of the beaks rather deep; muscle scars distinct. 



I have never seen the soft parts of any member of this group. 

 Quite a number of descriptions have been published of various nominal 

 species, most of which go into details as to the color of the different 

 parts, but do not give an atom of information as to real characters. 

 The animal is dark or highly colored, aud seems to be gravid in sum- 

 mer, aud no doubt carries the young in the outer gills alone. Gills 

 large, wider behind, inner the larger, especially in front; mantle thick- 

 ened at the edges; palpi very large, elliptical, rouuded behind, hanging 

 at an angle of 45°; branchial opening large, strongly fringed.^ 



' I think this is a form of grelloisianus. Some forms of the latter are very much 

 like U. tigridus Bourguignat, but he says that it has roughened beaks while those 

 of iigridis are always smooth. 



'^I have only seen the type, a young shell, aud its relations are doubtful. The 

 sharp, rather pustulous, beak sculpture, and the shiuiug, yellowish epidermis are 

 like the pictorum group, but its form is peculiar. It may uot come from Sj^ria at all. 



'From a figure in Mai. d'Algerie, II, jjI.xix. 



