ACTINIANS OF GULF OF CALIFORNIA— CARLGREN 433 



2.8 fj, (basitrichs), partly 19.7-25.4 by 4.2-5.5 /x, partly 10-19 by 

 4.2-6.3 fjL (both microbasic ?)-mastigophors) ; those of the acontia 

 partly 24-29.6 by 2.8 ix (basitrichs), partly 35.2-42.3 by 6-7 /x 

 (microbasic amastigophors). 



Color in alcohol. — Pale flesh-colored. 



Measurements. — In contracted state, pedal disc about 1.7 cm., 

 height of the column about 1.2 cm. 



Collecting record. — Angeles Bay, April 1, 1940, two specimens on 

 snails from sand flat. 



Additional distribution record. — Panama. 



Remarks. — I have doubtfully identified the specimens as Antho- 

 tho'e panamensis because of the translucent column and the color. 



Order CERIANTHARIA 

 Family BOTRUCNIDIFERIDAE 



BOTRUANTHUS BENEDENI (Torrey and Klecberger) 



Figure 81, d 



Cerianthus benedeni Torrey and Kleeberger, 1909, p. 121, figs. 2, 3. 

 Botryanthus benedeni McMurrich, 1910, p. 11. 

 Botruanthus benedeni Carlgren, 1912, pp. 42, 44-46. 



Marginal tentacles up to about 100. Labial directive tentacle 

 {d) present. Arrangement of the labial tentacles: 2(d) 413.4312. 

 4312 — . Up to about eight mesenteries attached to the siphono- 

 glyph. Hyposulcus and hemisulci rather well developed. Free 

 parts of the directives not so long as the actinopharynx. Second 

 protomesenteries long but not so long as the first metamesentery. 

 Free part of the third protomesenteries about the same length as 

 the actinopharynx. Most of the mesenteries M and m reach down 

 almost to the aboral end of the body, metamesenteries B and h 

 short. Ciliated tracts a little below the actinopharynx structured 

 as the type 2. The ciliated tracts form a bunch of craspedonemes 

 above the cnidoglandular tract of the third protomesenteries and 

 the h and B mesenteries. The second protomesenteries and the 

 M and m metamesenteries are provided with ciliated tracts almost 

 their entire length. In the upper part of these mesenteries the 

 ciliated tracts form bunches of craspedonemes ; in the center the 

 craspedonemes are scattered; and in the lowest parts more con- 

 centrated. Cnidorages of different size are collected in botrucnide- 

 like bunches or as a pearl necklace on the craspedonemes of the 

 ciliated tracts, either close to the apex of the craspedonemes or 

 more inside. They are more numerous on the branched filaments 

 than on the scattered ones. The second protomesenteries and the 

 M and m metamesenteries are fertile, the other mesenteries sterile. 



