3(>0 HTLLKTLN ill'- 'I'll : I'NITKU -T.VTICS K1SH COMMISSION. 



fiiiiiiixniin'.- -i ionangia "suhscssile, ovate, smooth, with an even, shortly tubnlous mouth." 

 (Hineks. ) 



I>ist,-il,nt'ii>it.\ specinu-n in the 1 . S. Fish Commission collection at Woods Hole bears the label: 

 "E. by S., Siinkeiy light. 20 lath." 



This species has always hitherto been placed in the genus ,V^/./,-M. Its strictly alternate 

 . Kydrothecic, however, make it necessary to consider it. a s,-i-lnl<ii-<'lln in accordance with the definition 

 given above. 



M. x,;-inl,u-tn<i niiiitinn (Linn.). cl - KcrtulnreUn Iricuxijiilata (Alder). 



Sertularella tricuspidata (Alder). Fig. 61. 

 i Sertutarla trirusiiidata Alder, Cat. Zooph. North and Durli., i>. 21.) 



niie. Colony slender, branches alternate, divided into regular internodes, each of which 

 bears a hydrotheca. Hydrothewe cylindrical, slightly curved, distant, with a 3-toothed margin and 

 3-parted operculum. 



<iiinuiimi: Gonangia deeply ringed, ovate, with a constricted tubular neck and circular orifice. 

 Di*ti-ili>rt!on.\ specimen in the Fish Commission collection at Woods Hole bears the label "E. 

 by S., Sankety light, 25 fath." 



Sertularella rugosa (Linn.). Fig. <>'2. 



(fit'iii'lui'i'i rni/dfn Linn.. Sy<(. Nut.. )i. 1308.) 



Ti-iiiiliiiKonie. Colony minute, vjnbranched, or sparingly branched; intemodes short, each bearing 

 a' hydrotheca. Hydrothecic fusiforiii, very deeply and conspicuously marked with annular corruga- 

 tions; aperture quadrangular, rather obscurely toothed; teeth, 4: operculum composed of 4 pieces. 



Gonosome. Gonangia like the hydrothecse, but much larger. 



Distribution. Noank, on piles of wharf. Off Watch Hill, 17 to 21 fathoms. (Verrill.) 



Sertularella pclyzonias (Linn.). Fig. 63. 



(Sertularia polysonias Linn., Sj-st. Nat., p. 813.) ' 



Tropliosome. Colony branched in an irregular manner, the branches alternate, but not equally 

 distant, divided into regular Intel-nodes, each of which bears a hydrotheca; nodes oblique. Hydro- 

 theca! swollen below, narrowing above to a margin, with 4 shallow teeth and an operculum of 4 pieces. 

 floiiomiiie. Gonangia ovate, corrugated, with a short pedicel and quadrate aperture. 

 I >;.-,! rilmtirm. "Off New London, 6 fath.; Gardener Bay, 6 to 8 fathoms; Block Island Sound, 17 

 to 24 fathoms." (Verrill.) 



