6 ARKIV FÖR ZOOLOGI. BAND 13. NIO 3. 



Sertularella divaricata (Busk) var. subdichotoma (Krchp.) 



The embranchmeht is very irregular, the anastomosed 

 branches numerous, and many of the nodes indistinguishable. 

 The length of the hydrothecae reaches 0,352 — 0,384 mm and 

 the greatest breadth 0,192 mm. Gonothecae of typical appear- 

 ance and character rather common. 



Locality: Patagonia, Puerto Harris, 15 fathoms, "/o 1896, 

 several colonies, mixed with Bryozoa and seaAveed, growing 

 on a worm-tube; St. Cruz, one colony. (Swed. Exped. to 

 Patagonia 1896.) 



Sertularella turgida (Träsk). PI. 1, Fig. 7. 



This hydroid is already known from San Pedro, but the 

 specimens are remarkable because of the gonothecae having 

 spines considerably bigger than in those from the above- 

 mentioned locality figured by Torrey.^ The gonothecae, 

 not annulated, reach a length of 1,4 — 1,6 mm and a breadth of 

 0,60 — 0,83 mm. 



Locality: California, San Pedro, shallow water, 1874 

 (Dr. Eisen). Rather abmidant on seaweed. 



Sertularella meridionalis Nutt. Pl. 2, Fig. 1. 



Several fragments from a greater colony coUected. Bran- 

 ches divided into long internodes, each generally bearing 

 about 6 hydrothecae. These expand towards the distal and 

 proximal ends, and both the adcauline and abcauline walls 

 are more or less concave. The length of the adnate portion of 

 the hydrothecae is 0,416 — 0,448 mm and the free distal portion 

 0,352 — 0,384 mm. The breadth of the middle portion of the 

 hydrothecae reaches 0,320 — 0,352 mm. Gonothecae not found. 



Locality: Patagonia, St. Cruz. (Swed. Exped. to Pata- 

 gonia 1896.) 



Sertularella diaphaua (Busk, Allm.) Pl. 2, Fig. 2. 



Syn. S. Torreyi Nutt. and S. speciosa Congdon. 



To this species I must refer one single sterile colony 3 cm 

 high. The arrangement and appearance of the hydrothecae 

 agree well, as the figure shows, with the illustrations and 



^ ToRREY, H. B., Hydroida from the Pacific Coast of North America, 

 Fig. 62, 67. 



