108 THE PLUMULARID.E. 



Goiifiaome. Corbula open, composed of numerous narrow, widely separated leaves, each 

 bearing a hydrotheca near its base and a row of nematophores along its distal end. There are 

 several hydrotheca' between the corbula and the stem. 



Distribution. Coasts of Europe and (treat Britain, 12 to 40 fathoms; New England coast 

 (Hincks). 



The only mention I can find of the occurrence of this species in American waters is by Hincks, 1 

 who under "Habitat" says: " Massachusetts Hay (Agassi/.), Mingan Islands, Gulf of St. Lawrence 

 (teslc A. Agassiz)." I have been unable to verify this reference. 



Immense specimens referred to this species occur in the Bay of Naples, where they are found 

 branching in a straggling manner, and attaining a height of 3 feet. 



THECOCARPUS DISTANS (Allman). 



(Plate XXIV, tigs. 14-lli.) 

 Aglaopltrnia dixtans ALLMAN, Mem. Mus. Comp. /onl., 1877, V, No. 2, p. 44, pi. xxvr. 



Trophoftome. Hydrocaulus attaining a height of about -1 i nches, simple, rooted by an entangled 

 bunch of tubular filaments, fascicled below, becoming nonfascicled above, and here divided into 

 equal internodes, each of which carries a pinna on alternate sides; pinna- (hydrocladia) distant, 

 attaining the length of nearly an inch. Hydrotheca- deep, nearly cylindrical above, narrowed 

 below; margin crenate, with a single long tooth-like process in front; intrathecal ridge not con- 

 spicuous. Supracalycine neiuatophores not overtopping the hydrotheca; mesial nematophore 

 attaining about a third of the height of the hydrotheca, to which it is ad n ate for its entire length. 



Gonoiiome. Corbula- composed of numerous pairs of ribs, which are quite free from one 

 another, each carrying a small hydrotheca near its origin, and having 7iumerous tooth-like nciuato- 

 phores along its distal edge; peduncle of corbula rather long, carrying three hydrotheca-. 



Dredged off Pacific Reef from a depth of 283 fathoms. 



The above description is quoted entire from the original. Professor Allman does not state 

 that this species presents the peculiar thickened protuberances on the outer stem found in all the 

 other species that I have placed in this genus. It is interesting to note that the describe! 1 dis- 

 tinctly says that the corbula; "like the corbuhe, of other species are metamorphosed pinna*," 

 although lie afterwards, in the Challenger Report, places this species in the genus Lytocarpus, in 

 which the gonaugia are protected by true phylactogonia, which seem to me to be quite distinct 

 from corbula-. 



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



THECOCARPUS NORMANI,- new species. 

 (Plate XXV, figs. 1, 2.) 



Tniphoxome. Colony sparsely branched, attaining a height of 8 inches, fascicled, with the 

 component tubes diverted from their course at intervals to form flattened protuberances; hydio- 

 cladia alternate, about 1 inches long and divided into regular hydrothecate internodes. Ilydro- 

 theca- close set, robust, cylindrical, not appreciably diminishing below ; a single somewhat retrorse 

 anterior tooth and a number of minute lateral siimations around the margin; intrathecal ridge 

 inconspicuous; supracalycine nematophores rather smaller than in other species of the genus, not 

 reaching above the hydtothecal margin: mesial nematophore single, adnate to the hydrotheca, 

 reaching the level of the intrathecal ridge. 



Gonosome. Corbuhe composed of numerous separated pairs of narrow leaves, each bearing a 

 hydrotheca near its base, and a row of nematophores along its distal portion. There are six or 

 seven 'hydrotheca- between each corbula and the stem, those nearest the corbula being modified 

 by the suppression of their mesial nematophores, the one immediately preceding the corbula being 

 without any nematophore, its distal end free and elevated above the internode. 



IHxtribution. Albatross Station 2415, lat. K 30" 44', long. W. 79 20', 440 fathoms. 



This species bears about the same relation to T. ilixtanx that T. beueilicli does to T. bispinosus. 



1 British Zoophytes, 1868, p. 2H2. 



'-' In honor of the Knvrrrinl ( 'nuoii A. M. Normau, F. R. Z. S., a veteran worker in the field of marine /oology 

 anil to whom the science is greatly inclelik-d. 



