WIDERSTEN: ANTHOZOA FROM EASTERN COAST OF UNITED STATES 



number of muscle lamellae (Figure 3C). The short, 

 conical tentacles were 10 (12?) in number. 



NEMATOCYSTS.-Smp?/.s: basitrichs (rare) ca. 

 22 X 3.3, spirocysts (rare) ca. 28 x 3.8. ScapulUs: 

 spirocysts 25 x 3.8 - 49 x 4.4; basitrichs were not 

 found in the very damaged scapular ectoderm. 

 Tentacles: basitrichs (rare) 11.5 x 1.6-2.2 - 20 x 

 2.7; spirocysts 14 x 2.7 - 25 x 3.3. Actinopharynx: 

 microbasic p-mastigophors 24-32 x 3.5; spirocysts 

 17 x 2.2 - 25 X 4.9. Filaments: microbasic p- 

 mastigophors 22-23 x 4.4-4.9; basitrichs (?) 12- 

 13.6 X 3.8 jum. 



The alleged differences as to the form of the 

 tentacles between H. duodecimcirrata and H. 

 chrysantheUum would argue against my decision 

 to refer the specimen to the former species. 

 Considering the extensive contraction of the 

 specimen, this characteristic must, however, be 

 regarded as of minor importance. Of greater 

 importance here is the conformity with H. duo- 

 decimcirrata of the sizes of the nematocysts in 

 different organs (cf. Carlgren 1940a). The number 

 of fertile mesenteries (eight in the studied spec- 

 imen) is another argument for the individual 

 being placed in H. duodecimcirrata. 



Haloclavidae 



Haloclava producta (Stimpson 1856) 



OCCURRENCE. -39°00'N, 74°45'W, 15 m, 

 sandy bottom, 1 specimen. 



GENERAL CHARACTERISTICS.-The col- 

 umn of the strongly contracted and partly dam- 

 aged specimen is fusiform with the ectoderm in 

 closely lying, transverse folds. The color is grey. 

 The scapus has a few sand grains attached to the 

 ectoderm. The length of the column is 16 mm, with 

 the greatest diameter (at the middle of the body) 

 about 8 mm. The retractors of the protomesen- 

 teries are very strong, circumscribed, and ren- 

 iform (Figure 4A). The four pairs of metamesen- 

 teries are weaker than the protomesenteries. The 

 parietal muscles are rather strong (Figure 4B). 

 There is no sphincter. The actinopharynx is rather 

 short with a very deep siphonoglyph. The number 

 of tentacles was impossible to confirm; as there 

 were only mesogloeal fragments left of the tenta- 

 cles, neither the nematocyst types nor their sizes 

 can be treated. The location of the fragments of 

 the tentacles favors the belief that there are 20 

 tentacles in the living animal. 



NEMATOCYSTS.- Co/wmr?: basitrichs 20 x 2.7 

 - 24.5 X 3.3. Actinophanjnx: basitrichs 14 x 2.2 - 

 17.4 X 2.7, 38-57 x 4.4-4.9; spirocysts (only one 

 found) 43.1 X 3.8. Filaments: basitrichs 14 x 2.7 - 

 25 X 3.3, 70-83 x 4.4-5.5, 54.5 x 7 - 75 x 6.5-7.1 

 jLim. 



Peachia parasitica (Agassiz 1859) 



OCCURRENCE.-44°16'N, 67°38'W, 91 m, silt- 

 clay, 1 specimen. 



GENERAL CHARACTERISTICS.-The col- 

 umn of the specimen is strongly contracted, with 

 the length 24 mm and the largest diameter (at the 

 middle of the body) 15 mm. The proximal diameter 

 of the column is 8 mm. The exact arrange- 

 ment of the extended lobes of the conchula was not 

 possible to observe in the specimen. There is no 

 sphincter. The only siphonoglyph is thick-walled 

 and of the typical Peachia appearance. The 

 number of mesenteries are 20, six pairs being 

 perfect, and supplied with strong, diffuse retrac- 

 tors with rather high muscle lamellae. The four 

 pairs of imperfect mesenteries are equipped with 

 rather small, diffuse retractors and are laterally 

 and ventrolaterally located. The 10 conical ten- 

 tacles have broad bases. 



NEMATOCYSTS.-Co^Mmw: basitrichs 27-34 x 

 3.8-4.4. Tentacles: basitrichs 27-39 x 3.8-4.4; spi- 

 rocysts ca. 23 X 3.3 Actinopharynx: basitrichs 

 40-46 X 5.5; spirocysts 19-23 x 2.2-2.7. Filaments: 

 basitrichs 27 x 3.8 - 38 x 4.4; basitrichs (?) 39 x 

 6 - 45 X 7.6; microbasic p-mastigophors (rare) ca. 

 28 X 3.8 jum. 



The filamental nematocysts named "basitrichs 

 (?)" (above) might be ;)-mastigophors. As I have 

 had no chance of observing the exploded capsules 

 and as the axial filament does not show the typical 

 p-mastigophor structure in the unexploded cap- 

 sules, I am not now inclined to consider these 

 nematocysts, which are probably homologous to 

 the "penicilli-like mastigophors" found by Carl- 

 gren (1940b), as microbasic p-mastigophors. 



Actiniidae 



Bolocera tuediae (Johnston 1832) 



OCCURRENCE.-41°27'N, 69°02'W, 146 m, 1 

 specimen; 41°50'N, 69°26'W, 165 m, 1 specimen; 

 42°15.5'N, 69°59.5'W, ? m, 1 specimen; 42°25'N, 



863 



