THE COLLECTION OF MISS H. GATTT. 151 



This is a very minute species, not eiceecling a fourth of an inch 

 in height. The intemodes of the pinnae are easily bent on one 

 another, giving the impression of a movable joint between every 

 two hydrothecse. The corbulee are disproportiqnately large for 

 the minute trophosome, and are rendered remarkable by the line 

 of apertures along each suture. These apertures are caused by 

 the imperfect juncture of the sutures, and are so situated that 

 one occurs between every two denticles. 



The specimen was found creeping over a piece of gulf-weedi. 



Aglaophenia acftidentata, n. sp. (PI. XXII. figs. 1-4.) 



Tropliosome. — Stem irregularly branched, monosiphonic, spring- 

 ing in a crowded tuft from an entangled mass of tubular fila- 

 ments. Hydrotheca^ deep, widening from below upwards, margin 

 with nine strongly marked teeth ; intrathecal ridge distinct, 

 extending round the walls of the hydrotheca at a short distance 

 above the base ; mesial nematophore adnate to the lower two 

 thirds of the hydrotheca, and then continued to the level of the 

 margin as a thick cylindrical process ;, lateral nematophores ovoid, 

 short and wide, not overtoi^ping the hydrotheca. 



Gonosome. — -Corbula entirely closed, short and deep, with 

 about nine c)alesced costae, each having a spur-like denticle at 

 its base ; the peduncle carrying a single hydrotheca. 



Locality ? 



The present species attains a height of about 2 inches, and 

 differs but little from the typical AglaophenicB, It may be known, 

 however, by its deeply-cut hydrotheca-margin and its short thick 

 corbula. Indications of an imperfect septum may be seen in the 

 mesial nematophore near its distal extremity. The denticles of 

 the costae of the corbula are cup-shaped with emarginate orifice, 

 and exhibit very clearly the relation of these bodies to true 

 nematophores. The spur-like nematophore at the base of each 

 costa is well marked. 



AgLAOPHENIA LATE-CABIIS^ATA, U. Sp. (PL XXIII. figS. 5,, 6.) 



Tropliosome. — Stem simple, monosiphonic, springing at intervals 

 from a delicate creeping stolon ; pinnae alternate,, borne each 

 •by a strong process of the stem, the supporting process carrying 

 a strong spine and having a similar spine just below it. Hydro-" 

 thecse deep, with the margin deeply cleft into eight teeth,, the 

 antei'ior mesial tooth being bifid ; abroad keel extending along the 

 front of the hydrotheca from its margin to the mesial nemato- 



