VOL. XV 



1893 



^'''] PROCEEDINGS OF THE NATIONAL MUSEUM. 151 



The stomatoda'Uin possesses well-developed sipliouoj;lyplies Avith 

 smooth walls, the rest of the stomatodieiim being lougitudinally ridged. 

 There are only sixteen pairs of jnesenteries, all of whieli are perfect, 

 eight losing connection with the stoniatochenni, liowever, sooner than 

 the others. The longitudinal muscles are strongly developed, forming 

 a strong pennon (PI. xxi, Fig. 21), and the parieto-basilar {pbm) forms 

 a strong fold upon tlie surface of the mesenteiies. The reproductive 

 organs are borne by the mesenteries of the first cycle, wi; h the exception 

 of the directives. No acontia are present. 



There is necessarily some doubt as to the correctness of this identifi- 

 cation. The external structure agrees well with Dana's species, as does 

 also the habitat; as to the coloration nothing can be said. In referring 

 it to the genus Coiuh/laciis, I have separated it widely from the genera 

 to which it has previously been assigned. The nature of the spliiucter 

 and the arrangement of the mesenteries indicate a relationship to the 

 Antheadie, and of existing genera of this family, by its possession of 

 verructe, and of a I'osse, and l)y tlie al)sence of acrorhagi, it comes near- 

 est to Gondylactis. It differs from the described forms of this genus in 

 its size and in the prominence of the verrucit, but it seems advisable 

 for the present to include it in the genus. 



9. Myonanthus ambiguus, yn. ot sj). nov. 



Plate XXI, Fig. 22; Plate xxii, Fig. 23. 



No. 731(K. Statiou 2839. L:it., 33- 08' N. ; long., 80 ■ 15' W. Depth, 4U fathoms. 

 Many speciiiieiis. 



In looking over the collection soon after it reached me I noticed that 

 in the bottle which contained the species described below as Paractis 

 vinosa, there were a large number of examples of a form which, while 

 resembling the specimens of P. vinosa in general form and size, yet dif- 

 fered decidedly in color. On submitting them to anatomical examina- 

 tion I found that very decided structural differences existed, and that 

 I had to do not only with a distinct species, but even with a member 

 of a distinct family. After nuicli uncertainty as to the family to which 

 it should be assigned, 1 determined to insert it in this report as an ap- 

 pendix to the Antheadiie. My reasons for so doing will better be under- 

 stood after a description of the specimens has been given. 



They are all more or less contracted, some having the tentacles com- 

 pletely contracted, while in others they remain more or less exposed 

 (PI. XXI, Fig. 22). The color of the column and tentacles is pale pink 

 or flesh color. In height the less contracted specimens measure about 

 1""', their diameter ranging from 1.3 to 1.5^'". 



The base is adherent, and in many specimens is more or less covered 

 by a dark brown, somewhat granular cuticle. Its diameter is as a 

 rule somewhat greater than that of the column; in the specimen from 

 which the measurements given above Avere taken its diameter was about 



