34 



T. GiSLfeN. 



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

 very short (4 — mm). Combs here and there to P25 or P^,,. Distal 

 p. 16 — 18; 6 mm. 



Disk 14 mm. Anal interradius with coarse and large ealeareons 

 plates. 



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

 regeneration. Instead of the usual method of arm-division in this ge- 

 nus with an undivided arm now on llie I'iglit now on the left fiom a 

 II Brax, we have in this ease a type of ai'm-division that eontinually 

 gives uin'amitled arms to the inner side, but which on the outer side 

 continues in laniifv. 



iBr, 1-2 3+4... 11 + 12... 



11 V, 1-2 

 2I iBr, 12 3 + 4... 10 + 11... 



iBr, 1-2 3 + 4... 11 - 12... 



Br, 1 2 3 r4...11 + 12... 



IBr, 1-2 3 + 4... 



1 1+2 



III 2 3+4, 



11, 



11 1-23 14 



III 12 



III 12: 



I\', 1 2 iBr, 1 2....1U , II... 



\- 1 2 

 ' IBr, 1-2 3";-4...11 -i 12.. 



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



iBr 1-2 3 + 4....1U 11.. 



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



iBr 12 3 + 4. ...12+13. .17 + 18.. 22 + 23. 



Sjh 4 (St. 60) (M 4 mm. free dorsal sui-faee 1,:. mm. C. XXII 

 20—21 (D) 26—30 (V) 13—26 nun. i 2 whorls. 4"' segment a little 

 longer than broad, 5"' to 7"' or 8"' one L = P 2 X br, then shorter 

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

 cristas with small spines. Opposing spine h = ' 4 X the br of the segment. 



R — s ^•isible in the corners. 1 Bi- 1 h = ';! br. laterally free 

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

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

 as in the following ossicle: for the i-est the arm-bases arc rather smo(*th. 



