microbasic 6-mastigophors 31-34 x 4.4-4.9; 69-72 

 X 5.5 Tentacles (peduncles): microbasic b- 

 mastigophors 19-24 x 3.8-4.9; microbasic p- 

 mastigophors (very rare) ca. 36 x 7.6; atrichs (?) 

 ca. 15 X 5.5; spirocysts 19 x 3.8 - 38 x 5.5. 

 Actinopharynx: holotrichs 28 x 5.5 - 46 x 12; 

 atrichs (rare) ca. 12 x 4.9; microbasic p- 

 mastigophors (rare) ca. 22 x 6; spirocysts 17-23 x 

 3.8-4.4. Filaments: holotrichs 37 x 12 - 78 x 32.7; 

 hoplotelous microbasic p-mastigophors 24 x 5.5 - 

 44 X 10.9-12; atrichs (?) 34 x 3.8-35 x 4.4; spi- 

 rocysts (rare) ca. 31 x 3.8 jum. 



The three individuals in the collection having a 

 whitish color of the column (see above) deviate 

 from the combination of the cnidom and the 

 frequency of the nematocysts in some organs. 

 Tentacles (acrospheres): holotrichs 49 x 16.4 - 65.4 

 X 35.4; atrichs (?) 22 x 5.5 - 41 x 10.4; microbasic 

 p-mastigophors 19 x 4.9 - 46 x 6.5. Tentacles 

 (peduncles): holotrichs ca. 66.5 x 19.6; hoplotelous 

 microbasic p-mastigophors 37 x 7.1 - 64 x 8.7; 

 microbasic 6(?)-mastigophors 61 x 6.5 - 88 x 8.7; 

 spirocysts 23 x 2.7 - 52 x 4.4 jum. 



It is probable that the nematocysts charac- 

 terized as atrichs in the tentacles of the whitish 

 variety actually are holotrichs, the structure of 

 which was made unobservable by the fixing agent. 

 Difficulties in distinguishing between the two 

 nematocyst types has been pointed out by Carl- 

 gren (1945) with concern to corallimorpharians. 



Until studies on vital material of the whitish 

 color form have been undertaken, which will 

 possibly confirm the presence of atrichs in the 

 acrospheres, I am inclined to consider it as a 

 member of the species Corynactis delawarei. [In 

 Corynactis annnlata (Swedish Museum of Natural 

 History, reference number 1244) collected off 

 Tristan da Cunha, there is, however, a nemato- 

 cyst equipment in the acrospheres suggestive of 

 that described in the whitish color variety: holo- 

 trichs 46 X 12.5 - 60 X 9.3; microbasic p- 

 mastigophors (rare) ca. 20 x 4.9; atrichs (?) 

 19 X 5.4 - 25 X 6.5 jum; microbasic 6-mastigophors 

 were not found in the specimen studied by me.] 



Actiniaria 

 Edwardsiidae 



Edwardsta sulcata (Verrill 1864) 



OCCURRENCE.-44°00'N, 68°15'W, 110 m, silt- 

 860 



FISHERY BULLETIN; VOL. 74, NO. 4 



clay, 6 specimens, collected from three dredges. 



GENERAL CHARACTERISTICS.-The physa 

 is well developed. The scapus is divided into 

 longitudinal compartments separated by the 

 mesenterial insertions of the macrocnemes. The 

 color of the scapus is yellowish grey. The nemathy- 

 bomes are numerous and often closely aggre- 

 gated (Figure 2A). The periderm is strong, but 

 easily falls off; its color is yellowish brown. The 

 scapulus is provided with high, longitudinally 

 oriented ridges in the strongly contracted mate- 

 rial. The maximum length of the scapus and 

 scapulus is 40 mm, whilst the largest diameter is 4 

 mm. The 16 tentacles are conical, without ridges or 

 nematocyst concentrations. The yellowish-white 

 actinopharynx has one distinct siphonoglyph. The 

 retractors of the eight macrocnemes are circum- 

 scribed and more or less reniform (Figure 2B). The 

 parietal muscles are strongly developed with 10-12 

 partly branched muscle (lamellae on each side of 

 the lamella of the septum (Figure 2C, D). The meso- 

 gloea of the mesentery is much thinner in the 

 vicinity of the retractor portion than was de- 

 scribed by Carlgren (1931) in Edwardsia elegans 

 (Figure 2B). 



NEMAT0CYSTS.-5cajDMs (nemathybomes): 

 microbasic 6-mastigophors 90 x 5.4 - 110 x 6, 

 49 X 3.8 - 71 X 4.4 (the smaller nematocyst type 

 has reached a considerable less degree of 

 specialization than the larger type, the axial 

 filament of which shows great conformity with 

 that in 6-mastigophors of Edwardsia longicornis 

 Carlgren (cf. Carlgren 1940a). Scapulus: basitrichs 

 14 X 1.6 - 16 X 2.2. Tentacles: basitrichs 19- 

 26 X 2.2-2.7; spirocysts 10 x 2.7 - 25 x 3.8. Ac- 

 tinopharynx: basitrichs 16-26 x 2.2; microbasic 

 p-mastigophors (rare) ca. 24 x 4.4. Filaments: 

 basitrichs 19 x 2.2 - 24 x 2.7; microbasic p- 

 mastigophors (often with somewhat bent capsules; 

 axial filament = one third to half the length of 

 the capsule) 21-33 x 3.8-4.4; microbasic p-masti- 

 gophors (axial filament remarkably thin, and 

 about three-fourths of the length of the capsule) 

 23-32 X 4.4-4.8 jum. 



There are many morphological similarities 

 between E. sulcata and E. sipuncnloides. The 

 6-mastigophors in the nemathybomes of the latter 

 species are, however, always much smaller (in one 

 specimen from the U.S. east coast, studied by me, 

 they were 62 x 4.9 - 72.5 x 5.5, 42-44 x 4.4 /xm; 

 cf. also Carlgren 1931). 



