172 



DEPARTMENT OF THE XATAL SERVICE 



Selaginopsis inirahilis (Vevrill). 



Trophosome. Stem stout; branches regularly 

 alternate; hydrotlieea? tubular, distal portion free and 

 turned out from the stem, in two rows on the stem and 

 six rows on the branches; margin oval.^with two lateral 

 teeth; operculum of two flaps. 



Gonosome. Gonangia oval, not constricted to form 

 a neck; axKjrture large, circular; surface smooth. 



No. 84. 



Selaginopsis inirahilis. 



Genus Skrtularklla. 



Trophosome. Ilydrotheca? in two rows, alternate, usually with three or four 

 teeth and an operculum of three or four flaps. 



Gonosome. Gonangia usually supplied with ridges or corrugations. 



KEY TO SPECIES. 



a Hydrotheca with four teefli. 



h Stem more or less regularly annulated. S. fusiformls. 



hi) Stem not regularly annulated. 



'• Hydrothee-ce annulated or rugose. 



d Hydrothecse decidedly rugose. S. rugosa. 



(Id Hydrothecfc with complete or incomplete annulations. ''^. conica. 



cc IIydrotheca> smooth. * i^. ftolyzonias. 



qd TTydrothoca^ with three teeth, stem lax. hydrothec-r smooth. S. iricuspidata. 



SertulareUa conica Alhnan. 



Trophosome. Colony small, either unbranched or 

 with a few small branches like the main stem; hydro- 

 thecac nearly tubular, rather distant; annulations com- 

 plete or on the adcauline side only; margin with four 

 teeth; operculum with four flaps. 



Gonosome. Gonangia oval; margin with four stent 

 teeth; surface rugose with distinct crests on the rugo 

 sities. 



No. 85. 

 Serf ularrlla conica. 



Sertularella fusifor)nis llincks. 



Trophosome. " Stem slender, slightly zigzag, gener- 

 ally simple, annulated at the base and below each 

 calycle; hydrothecae bent in opposite directions, elon- 

 gate, somewhat flask-shaped, smooth, one to each inter- 

 node; aperture quadi'identate; opercukun composed of 

 four pieces, each internode, with its calycle, of a fusi- 

 form figure" (Hincks). 



Gonosome. " Gonotheca^ elongate, ovate, slender, 

 ribbed across, produced at the upper extremity into a 

 short neck and toothed"' (Hincks). 



No. 8'6. 

 Serlnlarella fiosiforntis 

 (after Hincks). 



