45 



AU the radial pouches are about the same in breadth, and the sep- 

 tum between them is nearly straight. The ocular pouch, however, is 

 a little broader than the tentacular pouch at the level of the sense 

 organ. 



The oral arms are quite characteristic and remarkable. They are 

 lanceolate in form and are at the proximal part as broad as the radial 

 length of the umbrella and a 

 little longer than that in length. 

 They are finely frilled at the 

 margin. The lateral halves of 

 them are folded internally and 

 the whole is very strongly 

 curved, so that they coil them- 

 selves like a screw and as the 

 coil is very close they assume 

 the long conical shape, tapering 

 gradually to a pointât the distal 

 end. Thus the oral arms of this 

 medusa resemble in appearance 

 to those of rhizostomatous me- 

 dusae. The thick proximal part 

 of the oral arms is covered with 

 nesselwarts. 



The tentacles are compres- 

 sed laterally at the base, and all 



of them are nearly the same in length. They are longer than the dia- 

 meter of the umbrella. They are 24 in number. 



The four subgenital cavités are round or sometimes oval. 



The color of the umbrella is told to be light brown, that of the 

 tentacles and the mid-rib of the oral arm bro\*'n. 



The examined specimens are 70 — 100 mm in diameter of the um- 

 brella. They are from the Monterey Bay and it is said that they abound 

 there in summer. 



Dec. 10, 1898. 



5. Clava glomerata mihi, eine anscheinend neue Hydroide. 



Von Dr. Einar Lönnberg, Upsala. 

 (Mit 1 Figur.) 



eingeg. 12. December 1898. 



Mit dieser kurzen Notiz wünsche ich die Aufmerksamkeit der 

 Herren Kollegen, die Gelegenheit haben die marinen biologischen 



