HO T. GisLÉN, 



I Br 1 and Br 1 with a slight lateral carinatioii. P.^ lacking. Small 

 orals. 



Sp. 52 (St. 54) R— s h hr. I 15i' 1 ami 2 wiili a rather dis- 

 iiiicl median crista. The L of the distal p — s == 2 br. 



Sj). 53 (St. 55) 3'i— 6"' cirral the longest, L = 2V2 br. L of the 

 distal segments 1^/2 br. A dorsal carination from cirral 9. Oppos- 

 ing spine : h ^ ^'2 of the br of the segment. 



B — s as in Sp. 37. U — s h = V/2 br, with a high carina, llv 

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

 very last Br-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 P,). An axillary partly 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 I'ight, 2 mm., 

 without pinnules. Of the remaining arms too the right ones are usually 

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

 lation: 



13r 1—2 3 + 4 5 6 7 8 9 10 ÏÏ 12 + 13 U 15 



R I 1—2 



Br 1—2 3 + 4 5 6 7 8 9 10 11 Ï2 13 14 15 



Sp. 54 (St. 57) R-s h = br. I Br 1 and 2 rather smooth. P, 

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

 resoi'bed. A small intumescense for a parasitic Stylina. 



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 — 36 shows the following distributions. X arms: 18 speci- 

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

 peculiar that the largest specimens often have only X ai-ms, while the 

 multibrachiate specimens have shorter arms. A similar condition is 

 also noticed in Cijllometra pvlchella and has perhaps something to do 

 with the catching of the food. 



