34 



T. GiSLÉN. 



P„ 24-37 (6—7 T) 11 — 13 mm., l\ 20-35; 5—9 mm., P., and P, 

 very short (4 — (5 mm). Combs here and there to Pjg or P.^,,. Distal 

 p. Ki — IS: (■) mm. 



Disk 14 mm. Anal iiitorradius with coarse and large calcareous 

 plates. 



In this specimen there is a fine example of »mulliplieative» arm- 

 regeneration. Instead of the usual method of ai'm-division in this ge- 

 nus with an undivided arm now on the right now on the left fi'om a 

 II Brax, we have in this case a type of arm-division that continually 

 gives unramified arms to the inner side, but which on the outer side 

 continues to I'amifv. 



IIl-2 3+4i 



I 1+2 



IIIj 12 



IV, 1-2 



Brj 1-2 3+4... 11 + 12. 



1+11.. 



Ill, 1-2 



IVj 1-2 



II 1-2 3 + 4 



III 



1-'? 



Ill 1-2 



Br^ 1-2 3 + 4... 10 

 Br, 1-2 3 + 4... II + 12... 

 Br, 12 3 + 4. ..11 + 12... 

 Br, 1-2 3 + 4... 



Br, 1-2. ...10+ 11... 



Br, 12 3--4...11 +12.. 

 Br 1-2 3 + 4.... 11 + 12.. 

 Br 1-2 3 + 4. ...10+11.. 

 Br 1-2 3 + 4.... 11 + 12... 

 iBr 1-2 3 + 4.... 12+13.. 17 + 18.. 22 + 23. 



V, 1-2 



Sp. 4 (St. 60) Cd 4 mm. free dorsal surface 1,?. mm. C. XXII 

 20—21 (D) 26-30 (V) 13—26 mm. i 2 whorls. 4* segment a little 

 longer than broad, 5"' to 7"' or 8*'' one L= P/aXbr, then shorter 

 again. From the 7"' or 8* segment polished segments with transverse 

 cristas with small spines. Opposing spine h = V* X the br of the segment. 



R — s visible in the corners. I Br 1 h = V^ br, laterally free 

 from each other. I Brax pentagonal h = ^/2 X br. Lateral margins 

 form an obtuse angle with I Br 1. Distal borders with small spines 

 as in the following ossicle; for the rest the arm-bases arc rather smooth. 



