140 



TjCdvdvr (/(/sjH'rsHS (IxATIIKE). 



PI. XI, Fig-. 2—2/: 



rdhicmoii (/(/f<p('r.siis^ II. IvATiiKE, Zui' Fauna der Krvm. Eiu 

 Beitrag, in : Mémoires pres. a l'Acad. Iiiip. des Sciences de Saint- 

 Pétersbourg par divers savans et lus dans ses assemblees. T. IIL 

 8t. Pétersb. 1837, p. 368, ïab. IV, fig. 4. 



LcdHikr recUrostris, V. Czerniavsky, Crust. IJeca})t)da I'onfica 

 littoralia. Cliarkow 1884, p. 40. 



23 specinu'us, 8 of wliich are adult ova-bearing feniales, col- 

 lected April 1914 in tlie Bay of .Sebastopol, Bhick Sea, presented 

 by Mr. S. Zekxiiv of tlu' Biob)gical Station of Sebastopol. 



T\w largest specimens, ova-bearing feniales, are 75 mm. long- 

 and fully agree witli Batiike's desci'i])tion. Their rostral formulae 

 are the folloAving : 



7 + 1 . 5 + 2 



-— — one specimen, — . one sj)ecimeii. 



6 + 1 . 5 + 1 



—-. — one specimen. — , — seven siiecimeiis. 



o ^ ' 4 



6 + 1 . 5 i- 1 



2 — sfveii specimens, — -^ — two specimens. 



6 + 1 . 4 + 1 



— „ — two specimens, — j — one specimen. 



We conclude from tliese formulae tliat in the tyj)ical species 

 which inhabits the Black Sea, the lower margin of the rostrum 

 (Fig. 2 — 2h) is usually armed with foiir teeth, rarely with fhree, 

 as already stated by Rathke, while five teeth are a great ex- 

 ception. In 10 specimens the upper margin is armed with six 

 teeth, in 10 with five: accordiiig to Kathke's description, how- 

 ever, the usual number should be fire. The 2'^ tootli of the upper 

 margin is situated slightly before the orbital margin or imme- 

 diately over it, but even in the latter case the apex of the tooth 

 is invariablv situated before the orbital margin. One observes 



