110 



THE PLUMULARID.E. 



CLADOCARPUS Allman (modified). 

 Cladocarpiis ALLMAN, Traus. Zool. Soo. Lend., 1874, VIII, 1't. 8, p. 477; Mem. Mus. Comp. Zool., 1877, V, No. 2, p. 49. 



Gonosome. Stem simple or fascicled; hydrotheca' deep, with margins usually smooth, or with 

 sinuations or crenulations laterally, and one or two distinct anterior teeth ; mesial nematophores 

 very short, spur-like, sometimes not ad u ate to the hydrotheca. 



Gonosome. Gonangia borne on the stein or bases of the hydrocladia, aud protected by simple 

 or branched phylactogouia, springing from the proximal internode of the hydrocladium, and 

 bearing uematophores, but no hydrotheca'. 



This is one of the many well-defined genera introduced by Professor Allmaii. The type 

 species was secured by the Porcupine. Three more species were added ill the llydroida of the 

 Gulf Stream, several in the Challenger Report, aud others by Yerrill, Clarke, aud Fewkes, while 

 five new species are included in the present work. Most, if not all, the species are found in 

 comparatively deep water, which may account for the genus not being discovered earlier than 

 it was. 



In the trophosome. Cladocarptm resembles Thecocarpus more than any other group, especially 

 in the shape and margins of the hydrotheca', while, on the other hand, its gonosome allies it to 

 Aglaophenopsis, from which it differs in having no hydrotheca- on the phylactogonia. 



Distribution of American species of the genus Cladocarpus. 



It will be seen that only three of the fourteen species have been found at a depth less than 50 

 fathoms and none under 20 fathoms, while one, C. flexuosus, was dredged from a depth of nearly 

 1,000 fathoms. 



With the exception of C. formosus Allman, from the Japan Sea, no species of this genus has 

 been found except in the North Atlantic, so far as I can ascertain, and the center of distribution 

 is evidently the West Indian region. 



As would be expected from its bathymetrical distribution, this essentially deep- water genus is 

 more largely represented in northern waters than most of the I'lumularian genera. 



KEY TO AMERICAN SPECIES OF THE GENUS CLADOCAUPI'S. 



"Sound ; Srlor lv $***" ** conspicuous sigmoid intrathecal rldg.. . C. sigm a. 



the knrest Hydrotheca without conspicuous intrathecal ridge C. compressus. 



A single conspicuous anterior tooth. Lat- ( Hydrothec:i' with deep anterior flexure C. ventricosus. 



eral teeth replaced by minute sinua- j Anterior profile nearly straight C.JIexiKs. 



tioas. Hydrocladia not conspicuously ] Anterior profile strongly convex C. obliqtutx. 



slender or sinuous. (Anterior profile concave above and convex below 6'. septalus. 



