JÄDERHOLM, EXOTIC HYDROIDS IN THE SW. ZOOL. STATE MUS. 9 



length of the hydrothecae 0,160 — 0,178 mm and breadth at 

 margin 0,122 — 0,131 mm. Two median teeth, one anterior and 

 one posterior, are to be found and on either side of these 

 there are four lateral teeth. 



Locality: The Indian Ocean, Java Sea, Nordwachter 1891 

 (Dr. C. AuRI^VlLLIUs). Small sterile specimens 5 — 7 mm in 

 length collected. 



Aglaophenia acacia Allm. 



Locality: The Azores, Fayal, Villa Franca, O — 15 fat ho ms, 

 1869, one colony (Josej)hine-Exped. ) 



Agiaophenia struthionides (Murray). 



Locality: California, San Pedro, in the littoral region, 

 1874 (Dr. Eisen). Numerous fertile colonies collected. 



Lytocarpus peiinarius (Lin.) 



Locality: The Indian Ocean, Singapore, 5 — 7 fathoms, 

 1845 (v. Duben). 



Lytocarpus philippinus (KiRcnr.) 



Locality: The Indian Ocean, between Batavia and Singa- 

 pore (Eugenie-Exped. ) Only a few sterile colonies. 



Halicornaria gracilicaulis (Jäderh.) Pl. 2, Fig. 9. 



Syn. Lytocarpus gracilicaulis Jäderh. — Represented in 

 several specimens 15 — 20 cm high, with the stems and prin- 

 cipal branches fascicled. Ramification rather variable. In 

 this respect the young colonies agree with those described and 

 figured by myself^ wliile the older specimens correspond 

 with the hydroid described by Thornely under the name of 

 Lytocarpus Hornelli. The dimensions are: length of the hy- 

 drothecae 0,329 — 0,338 mm, their breadt hat the mouth 0,131 

 — 0,141; the length of the internodes 0,404 — 0,423 mm, and 

 their breadth at the distal end about 0,07 mm. Gonothecae 

 not found. 



^ JÄDERHOLM, E., Aussereuropäische Hydroiden im Schwedischen Reichs- 

 museum Pag. 299, Taf. 14, Fig. 3—4. 



Arkiv för zoologi. Bd 13. K.-o 3. 1* 



