ACTINIARIA lg 



p. 723) has stated that only six mesenteries were perfect in the type and that the mesenteries of the first 

 order were fertile in one examined specimen, sterile in another. I have controlled my earlier observations 

 and examined in all three specimens of P. chromatoderus. All three specimens were provided with 12 perfect 

 pairs of mesenteries ; the mesenteries of the second order do not reach as far down on the actinopharynx as 

 the six first pairs. The two first cycles of mesenteries were fertile (2 specimens examined). Maguire has 

 probably not sectionized the whole animals but drawn his conclusions from solitary sections. In the second 

 Paranthus-species there were 3 cycles of mesenteries perfect, some of the mesenteries of the third cycle were 

 perfect only in the uppermost part of the actinopharynx. 



Concerning the genus Parantheoides I think that we may place it together with Paranthus as synonym- 

 ous with this genus. The only difference between the two genera is that Parantheoides is shorter than Paran- 

 thus, but as the only dredged specimen was rather strongly contracted, it is possible that the difference is not 

 so considerable as might be supposed from the exterior. 



Phelliomorpha (type P. crassa (Dan.)) is synonymous with Cactosoma, belonging to the family Halcam- 

 pidae (compare p. 124). 



Phelliopsis (type P. panamensis (Verr.)). If this genus, proposed by Verrill 1899 p. 214), really is 

 devoid of acontia but has basilar muscles, which will have to be verified first, it may belong to the family 

 Paractiidae and form a distinct genus. Perhaps it is related to "Paractis" ferax (Stuckey 1909 p. 387). 



Pycnanthus (type P. maliformis (Me. Murr.)). This genus, characterized by Me. Murrich (1893 

 p. 172) is a good genus. I have here given a more complete diagnosis of the genus and described two new 

 species (compare further this genus). 



Polysiphonia (type P. tuberosa R. Hertwig (1882 p. 56)). This peculiar genus has been explicitly 

 described by myself (Carlgren 1918 p. 36). 



Raphactis (type R. nitida Verr.) probably does not belong to this family. Possibly the genus is 

 related to Korenia, Amphianthus etc. (compare Synanthus). 



Sicyonis (type 5. crassa R. Hertw.) placed by Hertwig 1882 into a special family Sicyonidae, is, as 

 I have before suggested (1899 p. 40), a Paractiidae (compare this genus). 



Stomphia (type 5. coccinea (O. F. Mull.) = S. Churchiae Gos.) is, as I have before shown (1893), a 

 distinct genus among the Paractiidae (compare this genus). 



Synanthus (type 5. mirabilis Verr.). On the basis of Verrill's short and imperfect original descrip- 

 tion (1879) of this genus, Andres (1883 p. 584) has suggested that it is a Zoanthid. It is probable that this 

 suggestion is correct, which, however, cannot be decided until the type-specimen has been examined. On 

 the other hand, I can verify that the species, which Verrill later (1883 p. 48 PI. 5 fig. 9) describes as P. mira- 

 bilis, belongs to the Zoantharia (s. str.). The very description indicates that we have to do with such an 

 animal and a control examination of a specimen, received by The United States National Museum, proves 

 the specimen tobeanlsozoanthus.I here give a short diagnosis of this species, still making the observation 

 that the description of its exterior is imperfect, on account of the scarceness of the material: 



Polyps solitary or connected with each other by inconsiderable, thin coenenchyme. Basal plate wide. 

 Column cylindrical or conical. Tentacles well developed. Ectoderm of the column very high, continuous, 



