102 AMERICAN HYDROIDS. 



Distribution. Brazil, Richard llathbuu. This form may at once be recognized by its very 

 large, spout-like mesial nematophores. 



Type slides. Cat. No. 18659, U.S.N.M.; Gat. No. 15366, Mus. State Uiiiv. Iowa; also in the 

 collection of the author. 



AGLAOPHENIA STRUTHIONIDES (Murray). 



(Plate XXII, figs. 10-12.) 



Pliimularia stnithionides MURRAY, Ann. and Mag. Nat. Hist., 3d ser., V, I860, p. 251, ]>1. xn, fig. 2. 



Aglaophenia franciscana ALEXANDER AGASSIZ,' N. A. Acaleph/e, 1XU5, p. 140. 



Aglaophenia arbor on VERRILL, Report of Commissioner of Fish and Fisheries, 1871-72, p. 730. 



Aglaophenia franciscana KIKCHENPAUEK, Feber die Hydroideui'amilie Plniuuluridie, 187(5, 1't. 2, p. 24. 



Aglaophenia stnithionides MARKTANNEK-TURNEHETSCIIER, Die Hydroiden des k. k. uaturhist. 1 lofmuseums, 1890, p. 265. 



Trophosome. Colony unbranched, attaining a height of about 4 inches in an incomplete 

 specimen; stem not fascicled, divided by oblique nodes into short internodes, each of which 

 bears a hydrooladium on its antero-lateral surface; hydrocladia directed forward and upward, 

 closely approximated, divided by oblique nodes into short internodes which are usually less 

 than twice as long as wide. Hydrotheca' closely approximated, obconical in general outline, 

 margin flaring and armed with eleven teeth, the anterior being lng, sharp, and directed 

 upward and backward, the next long and directed forward, the next rounded and bent outward, 

 the next rounded and directed upward, and the last, posterior, between the supracalycine ueinato- 

 phores. There is considerable variation in the marginal teeth, but this seems to be the typical 

 arrangement. Intrathecal ridge low, strong, directed forward, and curved slightly upward; 

 upper one-third of the hydrotheca free from the hydrocladiurn ; supracalyciue nematophores 

 large, not overtopping the hydrotheca; mesial nenuttophore large, its distal portion not separated 

 widely from the front of the hydrotheca, and when complete reaching the level of the margin of 

 the latter; there is a large triangular cauline nematophore at the base of each hydrocladium that 

 resembles those found in the genus Lytocarpus. 



Gonosome. Corbuhe on hydrocladia which take the place and position of regular hydrocladia, 

 and bear three hydrotheca' on the proximal portion ; corbula closed, with eight to thirteen pairs of 

 narrow leaves with a row of nematophores on the distal edge of each, but where the leaves are 

 slightly separated above it is seen that each edge of each leaf is armed with nematophores. There 

 are thus really two rows to each leaf, one of which is ordinarily concealed under the edge of the 

 preceding leaf. There is no pronounced process at the base of each leaf. 



Distribution. Santa Cruz; collected by Anderson. (Yale Museum specimen.) San Diego, 

 California; Edward Palmer. San Francisco, California; Alexander Agassiz. Puget Sound; 

 Doctor Steiudachuer. 



Professor Verrill 2 described a specimen in the Boston Society collection which he considered 

 to be the type specimen of Pltimuhiria arborea Desor. This specimen he has kindly permitted me 

 to study, and it proves to be Aglaophenia (Plumularia) struthionides Murray. It seems that fur- 

 ther consideration caused Professor Verrill to doubt that the specimen was Desor's type after all. 

 Through the kindness of Miss Slack, the librarian of Museum of Comparative /oology, at Cam- 

 bridge, I have received a copy of Desor's original description of Plumularia arborea, from which it 

 is seen that the Boston Society specimeu can not be Desor's type.' 1 Through uncertainty concern- 

 ing the labels, it is thought by Professor Verrill that the locality given for the specimen in question 

 is incorrect, and the validity of the label is further weakened by the fact that this species has so 

 far been found only on the Pacific coast. 



'Doctor Agassiz here regards Plumularia franciscana Trask as synonymous with P. stnithioniden Murray. A 

 comparison of the original descriptions furnishes good grounds for regarding this as an error. 



Invertebrate Animals of Vineyard Sound, 1872, p. 730. 



:1 My reason for deciding that the Boston Society specimen can not be 1 lesor's I', arborea is found in the following 

 sentence from his original description, Proceedings of the Boston Society of Natural History, III, p. 65: ''Cells 

 pyriform with a plain margin," etc. The italics are my own. The specimeu has the margin of the hydrotheca very 

 strongly dentate, the teeth being unusually jagged and conspicuous. 



