730 



M. supra-ventralis (V.L.) 1, midway between the lateral line and 

 the base of the ventral. 



M. postero-lateralis (Po.L.) 1, a little below the lateral line, in 

 the vertical from the space between the last and last but one of the 

 A.A. (vertically below the adipose fin). 



M. ventrales (V.) 6, forming a fairly regular arch; the foremost is 

 low down, between the bases of the ventrals, the second is higher, the 

 third highest, the fourth, fifth and sixth being again lower. (On the 

 right side, the third spot is not developed.) 



M. supra-anales (A.A.) 3, of which the lowest 2, together with the 

 last ventral, form a straight line, which runs obliquely uj)wards and 

 backwards ; the uppermost is more isolated, and is situated a little below 

 the lateral line. 



M. anales anteriores (A.A.) 7, on the right side 8. The last pho- 

 tophore lies a little beyond the beginning of the ventral luminous gland, 

 the last but one just at the anterior margin of that gland. 



M. anales posteriores (A.P.) 2, at the edge of the centre of the 

 luminous gland, and separated from both A.A. and P.C. by an interval 

 equal to the length of 2 or 3 scales. 



M. praecaudales (P.C.) 3, all single. The foremost is situated at 

 the end of the ventral luminous gland, the second immediately over the 

 fourth rudimentary spine of the caudal, and the third just at the end 

 of the lateral line. 



The scales in the lateral line are of the same size as the others. 

 Their number is 36 (the same on both sides). There are moreover on 

 each side 2 or 3 poreless scales at the base of the caudal. 



8. Einige neue Planktonorganismen aus südschweizerischen und ober- 

 italienischen Seebecken. 



Von Dr. Otto Zach arias (Plön). 



eingeg. 26. Februar 1905. 



Bei Gelegenheit einer Studienreise, die ich im vorigen Frühjahr 

 (1904) an die insubrischen Seen unternahm, entdeckte ich einige neue 

 tierische Planktonwesen, welche ich hier in Kürze charakterisieren will. 

 Die Abbildung derselben wird andernorts erfolgen i. 



So fand ich im Luganer See (Lago Ceresio) eine auffällige Va- 

 rietät der bekannten Tintinnoine Codonella lacustris Entz vor, welche 

 ein von der typischen Species erhebhch abweichendes Gehäuse besitzt, 



1 Hydrobiologische und fischereiwirtschaftliche Beobachtungen aus einigen 

 Seen der Schweiz und Italiens. Plön. Forschungsberichte, XII. Bd. 1905. IX. Kap. 

 S. 169—302. 



