THE PLUMULARID.K 



73 



In working over the material collected by Count Pourtales in the Gulf Stream, Professor 

 Allman found a species allied to Antennnlaria, but with hydrocladia scattered over the stem 

 instead of being arranged in verticils, for which he formed the genus Antennnpxix. As already 

 noted, the examination of the Challenger Plumularidai convinced Allman that his genus Anlen- 

 nopsis was untenable on account of its complete intergradation with Antcnnnlaria. By using 

 the canaliculated cueuosarc as a definite character of Antennnlaria, the remaining forms with scat- 

 tered liydrocladia can be conveniently grouped under a separate genus, and I therefore reestab- 

 lish Antennopsis for the reception of those forms which would be included under the original defi- 

 nition, minus those having scattered hydrocladia in connection with a canaliculated co'iiosare. 

 So far as I have been able to ascertain, the genus thus circumscribed is represented in American 

 waters only. 



Distribution of American species of the genus Antennopsis. 



[All the species are found ill the Floridian ami Wt-8t Indian region.] 



The above table indicates that this genus is well circumscribed both in geographical and bathy- 

 metrical distribution. 



KEY TO AMERICAN SPECIES OK ANTEXNOI'SIS. 



Stein not fascicled A. hippuris 



Hydrocladia borne on very long processes from the stem ; first iuternode liydrothecate. A. loiigicoyiia 



, Maiu stem strongly geniculate d.nigra 



First internodc (if 'hydrocladia not liydrotln-cate 4. distant 



Hydrothociu twice as deep as wide A. ninnilalii 



ANTENNOPSIS HIPPURIS Allman. 

 (Plate XI, tigs. 4-6.) 



ALI.MAN, Mem. Mus. Comp. Zool., 1877, V, No. 2, p. 35, pi. xxi. 

 KICWKKS, Hull. Mus. Comp. Zool., 1880, VIII, Xo. 7, p. V28. 



Anli'iinopsis 

 Aitteiiiinpxix 



Trophoxome. Colony attaining a height of about 2 inches, not branched; stem straight, not 

 fascicled nor caualicnlated, divided into irregular iuternodes, each of which supports a hydro- 

 cladinin on a stout process from its distal end; hydrocladia scattered on all sides of the stem, 

 slender, divided into alternating liydrothecate and intermediate internodes. Hydrothec;e borne 

 on proximal parts of iuternodes, rather deep, cup shaped, margins not everted; supracalycine 

 neuiatophores present; a mesial nematophore at the base of each hydrotheca, another on the 

 same iuternode above it, two on each intermediate iuternode, and one on the lower side of each 

 hydrocladial process of the stem. 



(lonostomv. Gonangia borne singly in the axils of the hydrocladia; male long and slender, 

 with an oblique terminal orifice; female shorter, stouter, slipper-shaped, with the orifice lateral. 



IHntribiiiion.Ofi' Double-headed Shot Key, 1!>5 fathoms (Pourtali's); lllake, hit. N. 3L' 07', 

 long. W. 78 37', 229 fathoms; Albatross Station 2005, lat. X. 29^ 47', long. W. 80 06', 203 fathoms. 



Type. In the Museum of Comparative Zoology, Cambridge, Massachusetts. 



ANTENNOPSIS DISTANS, new species. 

 (Plate XII, tigs. 1,2.) 



Trophowme. Colony attaining a height of 6 inches, branching in an irregularly alternate 

 manner; stem fascicled, branches fascicled proximally and nonfascicled on their distal portion, 

 and supporting hydrocladia upon long processes; hydrocladia often arranged in a pinnately 



