II. — Descriptions of New and Rare Species of Hypeoids from 

 THE New England Coast. By S. F. Clark/. 



A 



The material for this paper was gathered while at work on the 

 Hydroids hi the Museum of Yale College. This colleetion is mostly 

 from the New England Coast, and is very large and complete. 



Obelia bictispidata, sp. nov. 



Plate IX, fig. 1. 



The stem is erect, slender, straight or nearly so, compound, con- 

 sisting of many united tubes Avhich gradually diminish in number 

 toward the top, varying in color from a light horn, to a light whitish 

 brown, sparingly branched, and with three or four annulations just 

 above the origin of each • branch ; branches short, ascending, slender 

 and irregularly arranged, sometimes one, and often two branches 

 starting from a node ; branches few, very short, slender and ascending. 



Hydrothecre very deeply cainpainilate, narrow, tapering slightly 

 toward the base, very hyaline, and with eight to ten longitudinal 

 lines extending from the distal extremity nearly to the base ; the 

 rim is armed with very acute teeth, varying in number from sixteen 

 to twenty- two, and arranged in pairs, the spaces in which the longi- 

 tudinal lines terminate being a trifle wider and deeper than the alter- 

 nate spaces ; the pedicels supporting the hydrothecse are long and 

 tapering, consisting of about fifteen annulations. Gonothecfe un- 

 known. 



Height of largest specimens, about three inches (80"'"^). 



The specimens from which this species is described were taken in 3-5 

 fathoms, on the reefs near Thimble Islands, Long Island Sound, Sep- 

 tember 23, 1874. 



This species is closely allied to 0. Mdentata, but is readily distin- 

 guished from the latter by its entirely diiFerent habit, the narrower 

 and deeper calycles, and by the long tapering pedicels upon which 

 the calycles are supported. 



Obelia bidentata, sp. nov. 



Plate IX, fig. 2. 

 Stems clustered, straight or slightly flexuous, compound, composed, 

 at the base, of eight vor ten slender, united tubes, varying in color 

 from a light horn to a dingy wdiite, densely branched, and with three 



