iivi)i:<Tii>- OB TIM: \voons HOLE RICO [ON. 355 



CALYCELLA. 



i'. Stem n ('reeling root-stock parasitic on other species of hydroids, polyzoons, etc., 

 sending forth short annulated pedicels bearing tubular hyln>tlier;e with distinct, segmented opercula, 

 flonoxonii: (ii.MuiMj.tia oval, borne on the root-stock, and, when mature, bearing globular acrocysts. 



Calycella syringa (Linn.). Fig. 47. 

 (Sertiil'trit xi/rinifii I, inn., SyM. Xat., p. 1311.) 



Tro/ihofiniii'. Pedicels shorter than hydrothecse, very deeply annulated. Hydrothecse tubular, 

 with thick horn -colored walls and slightly sinuated margins; opercular segments rather short, triangular, 

 and capable of being drawn into the hydrotheca when the hydranth is retracted. There is often a sort 

 of an addition or tubular extension beyond the end of the hydrotheca, with a distinct margin bearing 

 the opercular segments. 



(liiiitisoini'. (ionangia oval, borne on short annulated pedicels and, when mature, with globular 

 acrocysts. 



Dixlrilmtiini. Found abundantly in the Woods Hole region, growing over all sorts of plant-like 

 marine organisms, especially other hydroids. 



CUSPIDELLA. 



Trophttixnne. Hydrotheca? sessile with a conical operculum. Hydranths with a conical hypostorne. 

 (liinnsdiiie. Not known. 



Cuspidella costata Ilineks. 



(British Hydrnid Zoophytes, p. 210.) 



Troidioxoiite. Ilydrotheere perfectly cylindrical and sessile, encircled with usually three sharply 

 defined annulations dividing the hydrotheca externally into four zones; operculum composed of 

 numerous segments, the distal ends of which can be retracted within the hydrotheca. 



Qtmotome. Unknown. 



Distribution. Reported by Professor Verril! from Fisher Island Sound, 9 to 11 fathoms. 



This species is identified with doubt by Verrill. 



LAFCEIDjE (modified). 



The modification consists of the removal of the small monosiphonic species, such as Lafcea 

 pocillum, which I have placed in Allman's genus Helidlu, and the genus Cnlycetta, which I have placed 

 in the family ('ampniiii/iiiid.r. 



Trnphosome. Stem fascicled. Hydrothecse tubular, without a partial septum dividing the 

 hydrotheca] cavity from that of the pedicel; margin without teeth or opercula. Hydranths with a 

 conical proboscis. 



(roiiosotiti: Gonangia found in compact masses incrusting the fascicled stem, oblong, each female 

 gonangium containing a single ovum. The gonosome of fjafcen was long regarded as a distinct 

 hydroid organism under the name Cup/tlnin n,-r/,i.> 



LAFCEA. 



This being the only genus of /,/i/ //,r found on the New England coast, it can be identified by the 

 family characters as given above. 



Kl'jl In t/ii'xiH'fii'x i if Ldfii'il full ml in tin' ]\'oodit Hull' nyioil. 



ttydrothecse short, almost scssik 1 L. fhiu/"vn. 



Hydrothi-ca- sk-nder, with distinct podicels which are waved or twisted /,. tirai'ilHinn. 



Lafoea dumosa Fleiri'ig. Fig. 48. 



H'hil. .Tonrn., n, p. 83.) 



Trophosotne, Stem simple, in the form of a creeping root-stock, or compound and erect. Hydro- 

 thecit strong, large, tubular, with short, sometimes hardly evident, pedicels. 



1 Srr New Hydroids from Alaska i\ud Puget .Sound, C. 0. Nutting. I'roc. U. s. N. M., vol. xxi, p. 747. 



