56 AMERICAN HYDROID8. 



given by d'Orbigny make it practically certain that his species was identical with the one described 

 long afterwards as X rfulin-iii fm'fiifii by Trask and universally accepted by later writers under 

 the latter name. This species differs from S. operculata va having the two conspicuous hydro- 

 thecal teeth of the same size. On the other hand, S. pulchella is closely allied to S. 

 Gray, from which it differs in having no spines to the gonangium. 



SERTULARIA BISPINOSA (Gray). 

 (Plate II, ligs. 8-11.) 



Dynamena lispinosa, GRAY, Dieffenbarh, Travels in New Zealand, 1842. 

 Di/niiini-iui liixpiiiiiiai HUTTOX, Trims. New Zealand Inst., V, 1872. 

 Sertulariu liisiiimuta COCGHTREY, Trans. New Zealand Inst., VII, 1875, p. 284. 

 Sertulitrni liixpinosa COUGHTREY, Ann. and Mag., 4th ser., XVII, 1S76, p. 27. 

 Sertularia bispinosa VON LENDENFELD, Australian Hydromednsae, Pt. 3, 1883, p. 407. 

 Serhilni-in liix/iinnxii BALE, Catalogue Australian Hydroid Zoophytes, 1884, p. 68. 

 Diphasic x/iniiiii-lrii-ii VON LENDENFELD, Australian Hydromedusse, Pt. 3, 1884, p. 414. 

 Serlulnriii l>ix/iiiinii VON LENDENFEI,D, Australian Hydromedusa?, Pt. 5, 1884, p. t)22. 

 Dipli<iiti<i xi/iiniiiirii-ii VON LEXDENFKLD, Australian Hydroinedusie, Pt. o, 1SS4, p. 623. 



c. Colony attained a height of 6 to 8 inches (Bale). Stein not fascicled, bearing 

 hydrothfcai throughout, internodes irregular, nodes distant, branches irregularly alternate, them- 

 selves branching dichotomously, internodes as in stem, a hydrotheca in the axil of each branch. 

 Hydrotheca 1 strictly opposite, not leaning forward, well separated in front, tubular, but some- 

 what flask-shaped, adnate to the stem or branch by one-half the adcauline side, distal end 

 narrowing to a moderately large aperture, margin with two abcauline teeth. Operculum not 

 evident in specimens examined. Entire periderm thick and heavy, giving a rigid aspect to the 

 colony. 



<I<>II<IXOIH<-. Gonangia large, obovate, with two flattened spines, one projecting from each 

 shoulder; aperture large, with narrow collar or neck. 



Dixti-ilxttion. East Coast of South America, All>atr<is(i Station 2771, lat. S. 51 34', long. 

 W. 68, 50.5 fathoms. New Zealand (Hutton); Australia (Bale); "Trod. Hav.," (specimen from 

 Levinsen.) 



The above description is taken from a specimen from Professor Levinsen and labeled ''<$'. 

 'bispiiHwi. Gray, Trod. Hav.," which agrees quite exactly with the description given by Bale, and 

 the specimen dredged by the U. S. Fish Commission steamer Albatrvs* off the east coast of 

 South America. This species seems much more rigid in habit than S. opereidata, and the differ- 

 ence in the hydrothecal armature, is reinforced by the conspicuous flattened spines on the 

 gonangia. 



SERTULARIA DESMOIDES Torrey. 



(Plate III, figs. 1-3.) 

 H,'i-ttiltiri<i ih'umoidtx TORREY, Hydroida of Pacific Coast, 1902, p. 65. 



Troplxixoiin . Colony very straggling and irregular in growth, arising from a creeping root- 

 stalk and attaining a height of about 2 inches. Stem very long and slender, divided into irregular 

 internodes, each of which bears one or more pairs of hydrothecse, branches exceedingly irregular 

 in their disposition, sometimes being very distant and forming a right angle with the stem and at 

 others forming an irregular tuft at the distal end, internodes variable, sometimes absent from 

 the greater part of a branch, and at others being 1 divided by fairly constant joints placed a short. 

 distance below the hydrothecse. Hydrothecse strictly opposite, pairs usually quite distant but 

 sometimes only moderately so, contingent in front for less than half their length, the distal por- 

 tion curving outward and ending in an apparently round or oval aperture, facing outward and 

 a little downward: no marginal teeth as a rule, but at times the margin has two obscure teeth. 

 Operculum usually of one flap attached to the abcauline side, others with two ill-defined flaps, 

 and again there will be two flaps, one above another, both attached to the abcauline side. 



