WIDERSTEN: ANTHOZOA FROM EASTERN COAST OF UNITED STATES 



and musculature of the specimens agree with 

 earher descriptions (cf . Carlgren 1934). 



NEMATOCYSTS.- Co/»w??: basitrichs 8 x 

 1.6 - 12.5 X 2.7, 29-35 x 2.7; microbasic p-masti- 

 gophors 17 X 4.9 - 27 x 6; spirocysts 29 x 3.3 - 61 

 X 6. Tentacles: basitrichs 18.5 x 3.8 - 30 x 6; 

 microbasic p(?)-mastigophors 18.5 x 4.4 - 29 x 

 4.4-5.5; spirocysts 19 x 3.3 - 47 x 7.6. Actino- 

 phari/n.r: basitrichs 24-25 x 3.3; microbasic p- 

 mastigophors 23 x 4.4 - 26 x 5.5 (axial filament = 

 about half the length of the capsule); ca. 27 x 4.9 

 (axial filament almost as long as the capsule). 

 Filaments: basitrichs ca. 9 x 2.2; microbasic 

 p-mastigophors 22 x 4.4 - 28 x 4.9. Acontia: 

 basitrichs ca. 14 x 2.2; 42 x 6 - 57 x 6.5 jim. 



Stephanauge nexilis (Verrill 1883) 



OCCURRENCE.-41°54'N, 65°44'W, 366 m, 2 

 specimens; on the denuded axis of an octocoral. 



GENERAL CHARACTERISTICS. -The yel- 

 lowish, firm column is strongly elongated in the 

 sagittal plane. The dimensions of the scapus is 

 proximally 22 x 4 mm, the height of the column 

 being 7 mm. In one of the specimens, the scapus is 

 provided with 26 low, circularly arranged tubercles 

 bordering 28 vague, radiating scapular ridges. The 

 mesenterial insertions into the body wall are 

 distinct. The number of the yellow, short, basally 

 wide tentacles is not greater than that of the 

 mesenteries (72 and 78). The sphincter is alveolar 

 and strong, slowly diminishing in thickness 

 towards the proximal part of the scapus. The wide 

 actinopharynx is brownish yellow. It is equipped 

 with two siphonoglyphs. The mesenteries are 

 hexamerously arranged, more than six pairs 

 (including the two pairs of directives) being 

 perfect. At least some of the perfect mesenteries 

 are equipped with genital organs. The retractors 

 are diffuse and rather weak. The strong parieto- 

 basilar muscles produce distinct muscular lobes 

 high up in the scapus, approximately at the middle 

 of the mesenteries. The number of mesenteries is 

 not greater proximally than distally. No acontia 

 were found in these specimens (they might have 

 been few and hidden by the strongly developed 

 filaments), but basitrichs of probably acontian 

 origin were measured in one of the specimens. No 

 cinclides could be found. 



NEMATOCYSTS.-Scajoi/s: basitrichs (rare) ca. 

 12 X 2.2; microbasic p-mastigophors 12 x 4.4- 

 5.5 - 19 X 5.5. Tentacles: basitrichs 9 x 1.7 - 20 x 

 2.7; microbasic p-mastigophors (axial filament 

 almost as long as the capsule; diameter = 

 1.5 iim) 21 X 5.5 - 23 x 7.1; spirocysts 25 x 3.8 - 

 49 X 4.4. Actinopharynx: basitrichs 15-18 x 3.3; 

 microbasic p-mastigophors 17 x 4.4 - 22 x 

 5.4-6. Filaments: basitrichs 14-16 x 2.7-3.3 

 (-28 X 2.7); microbasic p-mastigophors 16 x 

 3.8 (-6) - 27 X 5.5. Acontia{l): basitrichs 30.5-36.5 

 X 3.8 /xm. 



Hormathiidae (?) 

 Stephanauge (?) spongicola (Verrill 1883) 



OCCURRENCE.-39°56'N, 69°45'W, 201 m, 3 

 specimens; 40°00'N, 69°30'W, 128 m, 3 specimens; 

 40°02'N, 70°47'W, 161 m, 6 specimens; 40°03'N, 

 71°16'W, 183 m, 16 specimens. At all the localities 

 the specimens were found on the outside of the 

 parchmentlike tubes of onuphid polychaetes. 



GENERAL CHARACTERISTICS.-The col- 

 umn is often smooth but sometimes provided with 

 a few adhesive warts; it is divisible into scapus and 

 scapulus. The scapus was reddish brown to greyish 

 brown in the preserved material, its length being 

 4-12 mm. The largest diameter is 10-11 mm. The 

 scapulus is whitish to pale red. The periderm of the 

 scapus is thin and easily falls off. The tentacles are 

 conical, acute, and yellowish. They are hexame- 

 rously arranged in four to six cycles, those of the 

 inner cycles being distinctly longer than the outer 

 ones. The sphincter is short, mesogloeal, and 

 agrees in its structure with that described by 

 Carlgren (1950). It is not capable of covering all the 

 tentacles. The actinopharynx is about three- 

 quarters the length of the column, wide, and 

 equipped with 18-20 deep, closely lying longi- 

 tudinal folds (Figure 9A); it is yellowish in color. 

 One (?) to four siphonoglyphs are present. In a 

 specimen with two siphonoglyphs there was an 

 eccentric position for them. There are (5-) 8-12 

 pairs of perfect mesenteries, the imperfect ones 

 being 8-16 (-22) pairs. The structure of the retrac- 

 tors of the perfect mesenteries was in agreement 

 with that described by Carlgren (1950) and in 

 many ways reminiscent of those in Phellia gaus- 

 apata. The number of directive pairs varies, being 

 two, three, or four. The retractors of the perfect 



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