FISHERY BULLETIN: VOL. 74, NO. 4 



19 X 3.3 - 46 X 3.8. Actinopharynx: basitrichs 

 14 X 1.6 - 16 X 2.2 (- 27 x 2.7); microbasic p- 

 mastigophors 15 x 3.3 - 31 x 4.9. Filaments: ba- 

 sitrichs 14 X 1.6 - 28 X 2.7; microbasic jo-masti- 

 gophors (very numerous) 14 x 4.4 - 31 x 4.9- 

 5.5 jLim. 



Metridiidae 



Metridium senile fimbriatum [WerriW 1865) 



OCCURRENCE. -40°35'N, 67°59'W, 84 m, 

 gravel, 5 specimens; 40°40'N, 68°01'W, 84 m, sand, 

 1 specimen; 40°51'N, 68°55'W, 66 m, sand, 4 

 specimens; 41°04'N, 71°24'W, 42 m, 1 specimen; 

 42°00'N, 69°56'W, 48 m, gravelly sand, 1 specimen; 

 42°15'N, 70°12'W, 26 m, 3 specimens; 42°22'N, 

 70°18'W, 33 m, 2 specimens; 42°42'N, 65°18'W, 91 

 m, 1 specimen; 42°42'N, 65°40'W, 90 m, 3 

 specimens; 42°47'N, 66°25'W, 99 m, 1 specimen; 

 42°54'N, 66°14'W, 166 m, 2 specimens; 43°07'N, 

 65°57'W, 97 m, 1 specimen; 43°17'N, 65°35'W, 40 m, 

 gravel, 1 specimen; 43°36'N, 68°50'W, 115 m, 2 

 specimens; 43°43'N, 66°30'W, 84 m, 1 specimen; 

 43°44'N, 66°28'W, 75 m, 1 specimen. 



GENERAL CHARACTERISTICS.-They agree 

 with earlier descriptions of the species (cf., e.g., 

 Carlgren 1893:102). The height of the column 

 varies between 5 and 35 mm, and the diameter of 

 the pedal disc is 7-47 mm. The color is yellow to 

 yellowish brown in the preserved state. The 

 specimens from 40°5rN were all very young, the 

 youngest being equipped with only 12 tentacles. 



NEMATOCYSTS (sizes of the above-men- 

 tioned, small specimens in parentheses).- Co^?/mn: 

 basitrichs 15 x 2.7 - 19 x 3.3 (10 x 1.6 - 12 x 

 2.2); microbasic amastigophors 26-28 x 3.8-4.4 

 (16 X 3.3 - 21 X 3.8-4.4); microbasic p(?)-masti- 

 gophors 23-31 x 3.8-4.4; spirocysts 22-27 x 3.3- 

 3.8. Tentacles: basitrichs (11.5 x 1.6 -) 18 x 2.2 - 28 

 X 2.7-3.3 (17-21 X 2.7-3.3); microbasic amastigo- 

 phors 13 X 2.7 - 15 X 3.3; spirocysts 21 x 3.3 - 31 x 

 4.9 (11 X 2.7 - 17 X 4.4). Actinopharynx: basitrichs 

 26-39 X 3.8 (17 x 2.2 - 27 x 2.7-3.3); microbasic 

 p-mastigophors 22-23 x 3.8 (17-23 x 3.3-3.8); 

 microbasic amastigophors (rare) ca. 31 x 4.4. 

 Filaments: basitrichs (very rare) ca. 14 x 3.8 (12 x 

 2.7); microbasic p-mastigophors 16-25 x 4.4, 24-32 

 X 3.8-4.4 (12-14 X 4.4, 21-23 x 3.8-4.4). Acontia: 

 microbasic 6-mastigophors 51-67 x 3.2-4.9 (40 x 



3.8 - 57 X 4.4); microbasic amastigophors (28 x 

 3.8 -) 49-64 X 4.9-5.5 (36 x 4.4 - 55 x 5.5) jum. 



Aiptasiomorphidae 



Haliplanella luciae (Verrill 1898) 



OCCURRENCE.-39°00''n, 76°22'W, 16 m, silty 

 clay, 10 specimens. 



GENERAL CHARACTERISTICS.-They agree 

 with earlier descriptions (Stephenson 1925:888, 

 1935:197; Field 1949:10). The sizes of the nema- 

 tocyst capsules deviate, however, in some respects 

 from what has been described earlier (cf . Carlgren 

 1940a). 



NEMATOCYSTS. -Coiwrnw: basitrichs 10- 

 11 X 1.6, 19 X 3.3 - 23 X 3.8; microbasic p- or 

 amastigophors 19 x 3.8 - 21 x 4.4. Tentacles: ba- 

 sitrichs 15 X 1.6-20 X 2.2; microbasic p- 

 mastigophors 18 x 3.8 - 25 x 4.9; spirocysts ca. 

 16 X 4.4-4.9. Actinopharynx: basitrichs (?) (the 

 capsules are slightly bent) 30-32 x 2.7-3.3; 

 microbasic jo-mastigophors 23-27 x 3.8; micro- 

 basic p- or amastigophors 21-23 x 2.7-3.3. Fil- 

 aments: basitrichs 14 x 1.6 - 19 x 2.2; microbasic 

 p-mastigophors 22-28 x 3.8; microbasic a(?)- 

 mastigophors 17 x 3.3-28 x 3.8; spirocysts 12.5 x 

 2.7 - 17 X 5.4. Acontia: basitrichs 15-18 x 1.6; 

 microbasic p-mastigophors 43 x 5.5 - 56 x 

 6.5 jLim. It was not possible to determine if there 

 are any microbasic amastigophors present in the 

 acontia, as all the mastigophor capsules were 

 unexploded. 



The only difference in the cnidom of the above- 

 mentioned specimens and earlier descriptions of 

 the species (cf. Carlgren 1945; Field 1949) besides 

 the unsettled presence of microbasic amasti- 

 gophors in the acontia (cf. Hand 1955) are the 

 occurrence in this sample, of basitrichs in the 

 actinopharynx, in agreement with the conditions 

 in Aiptasiomorpha texaensis (cf. Carlgren and 

 Hedgpeth 1952). 



Sagartiidae 

 Sagartiogeton verrtllt drlgren 1942 



OCCURRENCE.-40°32'N, 67°05'W, 338 m, 3 

 specimens, on fragments of mussel shell; 42°25'N, 

 66°21'W, 256 m, gravel, 1 specimen. 



GENERAL CHARACTERISTICS.-The length 



870 



