NO. 28 NEW HYDROIDS — FRASER 3 



rugosities of the same type as those on the hych^othecae, but more 

 numerous, corresponding to the larger size of the gonangium. Margin 

 with four teeth. 



Holotype. — U.S.N.M. no. 43287. 



Distribution. — West of Puerto Rico, lat. i8°ii'55"N., long. 67° 

 42'5o" W. ; 180 fathoms. 



SERTULARIA SUBTILIS, n. sp. 

 Plate I, fig. 4 



Trophosonic- — Colony consisting of a single, slender, erect, un- 

 branched stem, 3 mm ; the basal portion, nearly one-half, without 

 hydrothecae, smooth, or with one or two annulations ; the distal por- 

 tion is divided into regular internodes, each of which bears a pair 

 of opposite hydrothecae at its distal end (4 pairs of hydrothecae in 

 specimen described) ; hydrothecae in the pair adnate at the base and 

 then turning gradually outward, so that the distal portion is almost 

 at right angles to the stem. The surface is provided with closely 

 placed, crested annuli. Margin with two strong teeth ; operculum of 

 two flaps. 



Gonosome. — Not observed. 



Holotype. —U.S.N.M. no. 43288. 



Distribution.— North of Puerto Rico, lat. i8°23'35" N., long. 65° 

 37' 10" W. ; 10 fathoms. 



AGLAOPHENIA CURVIDENS, n. sp. 



Plate I, fig. 5 



Trophosomc. — Colony reaching a height of 6 cm, sparingly 

 branched ; the principal portion of the main stem and of the branches, 

 fascicled. The simple portion is divided into regular internodes, with 

 a hydrocladium from each ; the hydrocladia alternate from left to 

 right. The hydrothecae are closely placed on the hydrocladium, adnate 

 throughout, rather stout for their depth, with a definite intrathecal 

 ridge about one fourth of the distance from base to margin, reaching 

 entirely across the hydrotheca ; margin with seven teeth that are 

 strongly curved inward ; the point of the tooth is acute but the tooth 

 is curved in so much that, from the lateral view, it appears rounded 

 or emarginate. The median nematophore is adherent at the base to 

 such an extent that the free portion starts more than halfway up the 

 face of the hydrotheca ; it reaches nearly to the margin of the hydro- 

 theca and has an opening at the base of the free portion as well as 



