vol.i.] Torrey. — Hydroida of the Pacific Const. 71 



axils of the branches. Otherwise the fragment in I lie Univer- 

 sity of California collection agrees well with his description. 



Fam. Plumulariidae L. Ag. 



Trophosome. "Hydrothecae cup-shaped, usually more or less adnate to 

 the stem or branches, and always arranged on one side only of the hydro- 

 cladia or branches, on which they grow. Nematophores present. 



Gonosome. "Reproduction by means of planulae. No medusae." (Nut- 

 ting, '01.) 



Aglaophenia. 



Trophosome. Hydrotheeal margin dentate; a posterior intrathecal ridge 

 present and well marked ; two supraealycine and one mesial nematophore 

 attached to each hydrotheca. 



Gonosome. "Gonangia inclosed in a true corbula formed of a modified 

 pinna, its leaves without hydrothecae at their bases. The corbula may be 

 either open or closed" (Nutting.). 



Aglaophenia diegensis, sp. now 



PI. IX. Figs. 84, 85, 86. 



Trophosome. Stems attaining a height of 150 mm., divided into short 

 internodes. Hydrocladia alternating, one to an internode. They may be 

 divided by very faint nodes into internodes of equal length, each bearing 

 one hydrotheca, adnate for almost its entire length; the nodal constrictions 

 are quite often wanting, however, or reduced to exceedingly faint grooves 

 on the side opposite the thecae. 



Hydrothecae one-fourth longer than the diameter of the mouth, laterally 

 compressed but flaring distally so that the aperture is approximately circu- 

 lar. Rim ornamented with nine irregular teeth, the median tooth is sharp 

 and recurved, though less abruptly than in A. struthionides . The teeth next 

 the median one on either side are the longest and directed strongly forward 

 and laterally. The next two on each side are curved upward and outward, 

 sub-equal. The smallest teeth are those next the hydrocladium. The teeth 

 in size and arrangement are more regular than in A. struthionides. There 

 may be a faint intrathecal ridge near the bottom of the theca, running 

 obliquely upward. 



Mesial nematophore reaches level of hydrotheeal mouth; tapers 

 slightly to tip after leaving wall of hydrotheca. Supraealycine nemato- 

 phores reach rim of theca; curve upward, forward and outward, narrowing 

 slightly to the orifice. 



Septal ridge just below supraealycine nematophores and one just above 

 bottom of hydrotheca. Cauline nemataphores as in A. struthionides: one tri- 

 angular, in axil of hydrocladium; another tubular, on base of shoulder 

 supporting hydrocladium; and a third, larger, tubular, just proximal to 

 latter. 



Gonosome. Corbulae substituted for the usual hydrocladia. Each corbula 

 is three times as long as broad, formed of eight pairs of alternating leaflets, 



