Die Hydroiden der niaoalhaensischeu Region und chilenischen Küste. 641 



four teetli, two of wlücli are narrow and situated at the epicauline 

 side, and two broader at the apocauline. 



Gonosome not present. 



Thmaria quadridens was dredged froni the same gronnd witli 

 Sertularia iniple.m. It is a rather slender form of much elegance, 

 and attains a height of nearly two inches. 



Locality. Station 314, between Cape Virgins and the 

 Falklands Islands; lat. 5P 35' S., long. 65" 39' W., depth 

 70 fathoms/' 



NuTTiNG gibt 1904. 1. c, eine neue Beschreibung des in London 

 befindlichen Originals und stellt dabei fest, dass die Art nur 

 3 Kelchzähne und 3 Opercularklappen habe. 



Sertiilarella nieridionalis Nutting 1904. 



Amer. Hydroids, part 2, p. 98, tab. 23, fig. 8, 9. 



Nutting's Beschreibung lautet: 



„Trophosome. — Colony compactly pinnate in shape, attaining 

 a height of about 2 inches. Stern not fascicled, flexuose, proximal 

 portion not diifering from the rest, not noticeably annulated, divided 

 into fairly regulär internodes by obliques nodes, each internode offen 

 bearing a brauch and two hydrothecae on one side and a single 

 hydrotheca on the other. Brauches regularly alternate, rather closely 

 approximated, constricted sharply at their origins, divided into long 

 and regulär internodes. Hydrothecae large, closely approximated, 

 tubulär, witli both proximal and distal ends expanded, both lower 

 and Upper profl^les concave; about one half of the adcauline wall 

 free; margin expanding, with three strongly developed teeth, and 

 a three-flapped operculum. 



Gonosome. Gonangia quite large, oblong conical. the distal 

 portion being ornamented with three to five, usually three, pro- 

 nounced annular turrets; neck small, tubulär, suddenly expanding 

 distally into a trumpet-shaped termination with a round oriflce. 



This very striking species bears considerable resemblance to 

 S. müneana, but ha'S fewer annulations and a more suddenly enlarged 

 termination to the neck of the gonangia. The trophosome is very 

 much more compact and robust than that of S. müneana, and the 

 hydrothecae are quite different in shape. 



Type slides. — Cat. No. 19767 U. S. N. M., Cat. No. 18709. 

 Mus. Stat. Univ. of Jowa; also in coUection of the author. 



