WIDERSTEN: ANTHOZOA FROM EASTERN COAST OF UNITED STATES 



slightly developed. The pedal disc is well defined 

 and excavated. The individual studied was sterile. 



NEMATOCYSTS. -Co/wmn (distally): basi- 

 trichs 17 x 1.6; microbasic p-mastigophors (?) ca. 

 16 X 3.3; spirocysts 33-60 x 3.8. Column (prox- 

 imally): basitrichs 21-26 x 2.2, 16 x 2.7 - 26 x 

 3.8; microbasic p-mastigophors (rare) ca. 33 x 

 5.5; spirocysts 14 x 2.7 - 53 x 3.3. Tentacles: 

 basitrichs 22 x 2.2 - 24.5 x 2.7; microbasic 

 jo-mastigophors 22 x 3.8 - 27 x 4.4; spirocysts 15 

 X 2.2 - 26 X 3.3. Actinopharynx: basitrichs 25 x 

 2.7 - 30 X 3.3; microbasic p-mastigophors 18.5 x 

 4.9 - 24.5 X 6; microbasic jo(?)-mastigophors 27 x 

 4.9 - 30 X 5.5. Filaments: basitrichs 22 x 3.3 - 32 

 X 3.8-4.9; microbasic /^-mastigophors (axial 

 filament = about half the length of the capsule) 20 

 X 4.4 - 26 X 5.4; microbasic p-mastigophors (axial 

 filament = almost the length of the capsule) 12.5 

 X 4.4 - 15 X 4.9; spirocysts 49-57 x 3.8-5.5 jum. 



The most obvious difference between the 

 above-mentioned specimen and the earlier de- 

 scription of the species (cf. Carlgren and Hedg- 

 peth 1952:159), besides the different color of the 

 column and the occurrence of 12 pairs of perfect 

 mesenteries, is the size of the filamental basi- 

 trichs. While the filaments in material from Port 

 Aransas and Port Isabel are provided with basi- 

 trichs ranging in size from 12.7 to 14 x 2.2 jum, the 

 above-described specimen has much larger nema- 

 tocysts of the corresponding type: 22 x 3.3 - 

 32 X 4.9 jum. The same tendency can be seen also 

 with regards to the basitrichs of the column. 



Antho/oba perdix CVerrill 1882) 



OCCURRENCE.-40°06'N, 71°00'W, 179 m, 1 

 specimen; 40°10'N, 70°00'W, 114 m, silty sand, 1 

 specimen; 40°10'N, 71°15'W, 110 m, silty sand, 1 

 specimen. 



GENERAL CHARACTERISTICS.-The col- 

 umn is smooth and, in the material studied, tran- 

 versely wrinkled. The smaller specimens are 

 olive-shaped; the larger specimen is cup-shaped 

 with an expanded distal part. The color is greyish, 

 with scattered, irregularly shaped, brownish spots. 

 The oral disc of the larger specimen is greyish 

 yellow with faintly marked, brown, and radially 

 directed streaks. An outer lip-shaped fold is here 

 provided on its outside with a zone, reddish brown 

 in color. Two parallel ribbons of the same color 



divide this fold and the central part of the oral disc 

 into two halves. The excavated pedal disc is faintly 

 set off from the column. The length of the column 

 is 12-21 mm, and its diameter is 16-44 mm. The 

 pedal disc is maximally 23 mm in diameter. The 

 tentacles are numerous (in the largest specimen 

 about 600), short and conical, greyish in color. They 

 are longitudinally furrowed and provided with an 

 apical pore; in the smaller specimens they are 

 sometimes equipped with small, papillar processes. 

 The tentacles are arranged in five cycles, those of 

 the outer cycles being much smaller than the inner 

 ones (even in the largest specimen the outer 

 tentacles are papillary). The fifth cycle of mesen- 

 teries is not complete. The number of perfect 

 mesenteries in the larger specimen is 48. There are 

 more mesenteries distally than proximally. The 

 sphincter is alveolar (Figure 6). The retractors are 

 diffuse and extended in length. The entoderm of 

 the tentacles and the oral disc is reddish brown. All 

 the specimens were sterile. 



NEMATOCYSTS. -Co/Mmw: basitrichs 20- 

 28 X 2.7-3.3. Tentacles: basitrichs 15-16 x 1.6-2.2, 

 23 X 2.2 - 36 X 3.3-3.8; spirocysts (very numerous) 



Figure 6.-Antholoba perdix. Sections through the distal parts 

 of the sphincter in young specimens, mgl-mesogloeal layer. 



869 



