110 T. GisLi:N. 



I Bi- 1 and Bv 1 with a slight latecal carination. P^, hicking. Small 

 07-als. 



Sp. 52 (8t. 54) R— s h=br. I Br 1 and 2 with a rather dis- 

 tinct median ci-ista. Tiie L of the distal p — s = 2 bi-. 



Sp. 53 (St. 55) 3"— 6'" eirral the longest, L = 2i 2 br. L of the 

 distal segments IV2 br. A dorsal eai'ination from eirral 9. Oppos- 

 ing spine : h = 1 2 of the br of the segment. 



B — s as in Sp. 37. R — s h = \2 br, with a high carina. IR 

 somewhat extended and projecting as flaps between I Br— s 1. The 

 very last Bi-segments with a small dorsal spine. The pinnule-suppor- 

 ting Br-s usually shaped like axillaries. The first pinnule most often 

 on Br 7 (sometimes also a small l*j). An axillary [lartly supports a 

 long arm on the left, which is 5 mm. long, and provided with a small 

 Pj and distal pinnules, and partly a smaller arm on the right, 2 inm.. 

 without pinnules. Of the remaining ai-ms too the right ones are usually 

 a little shorter than the left ones. P3 12; 2 mm. Example of pinnu- 

 lation: 



I Br 1—2 3 + 4 5 6 7 8 9 10 li 12 + 13 14 15 

 R I 1-2 - - 



I Br 1—2 3 + 4 5 6 7 8 9 I() H 12 13 14 15 



Sj). 54 (St. 57) R — s h = br. 1 Br 1 and 2 rather smooth. Pj 

 missing. The L of the distal pinnulars = 2 br. Disk 1,8 mm. Orals 

 resorbed. A small intumescense for a parasitic Siylina. 



Generally the radial crista is more distinct on the R — s in younger 

 specimens since the R — s are longer then. With increasing age the 

 R — s are more and more concealed by Cd, and shortened by the rapid 

 increase in the breadth. By this the crista also grows smaller and 

 finally only remains as a rounded tubercle. 



An investigation of the number of arms in the (nearly) full-grown 

 specimens 1 — 30 shows the following distributions. X arms: 18 speci- 

 mens, XI: 9 sp., Xll: 5 sp., XIII: 2 sp., and XVI: 2 sp. It is rather 

 peculiar that the largest specimens often have only X arms, while the 

 multil)rachiate si)ecimens have shorter ai'ms. A similar condition is 

 also noticed in Ci/Uomelra ]nilchell(i and has ]ierha]>s something to do 

 with the catching of the food. 



