ACTINIANS OF GULF OF CALIFORNIA— CARLGREN 419 

 Family ACTINIIDAE 



PHYMACTIS CLEMATIS (Drayton) 



Actinia clematis Drayton, in Dana, 1846, p. 130, pi. 1, figs. 4, 5. 



Phyviactis clematis Milne-Edwards, 1857, p. 275. — Verrill, 1869, p. 476. — 



CARLGREN, 1898, p. 17; 1922, p. 145.— McMuRRiCH, 1904, p. 259. 

 Actinia fiorida Drayton, in Dana, 1846, p. 131, pi. 2, figs. 6-8. 

 Phyma-ctis fiorida Milne-Edwards, 1857, p. 274. — Vb3RRILL, 1869, p. 476. 



The nematocysts of the two small specimens agree fairly well 

 with those of the individuals from Juan Fernandez (Carlgren, 

 1922, p. 146), but those of the marginal spherules are shorter in 

 the latter. The atrichs of the marginal spherules are 48-77.6 by 

 4.2-5.6 IX and 36.7-70.5 by 4.2-5.6 jx respectively in the two speci- 

 mens and the very common basitrichs 53.6-87.4 by 2.8 jn and 

 51-86 by 2,8 ^ respectively. In a specimen of about the same size 

 from Juan Fernandez, the atrichs are 41-67 by 4.2-6 ju,, the 

 basitrichs 49.3-76 by 2.8 jx. The nematocysts of the vesicles in 

 the larger specimen are 17-21 by 2.5-3 /x (basitrichs, common) ; 

 those of the tentacles 18.3-26.8 by 2.5-2.8 /i (basitrichs, very nu- 

 merous) ; those of the actinopharynx partly 18.3-33.8 by about 

 2.8 fx (basitrichs), partly 19.7-24 by 4.2-5.6 ^ (microbasic p-mas- 

 tigophors) ; those of the filaments partly 10-12.7 by about 2.2 /x, 

 partly 21-36 by 3.5-4.2 fx (both basitrichs), partly 19-23.3 by 

 4.2-5.6 /i, (microbasic ?9-mastigophors). 



Collecting record. — Puerto Escondido, March 26, 1940, two 

 specimens. 



Additional distribution record. — Ecuador ; Peru ; Juan Fernan- 

 dez, Chile. 



Remarks. — The present habitat is the northernmost known. 

 The small size of the specimens indicates that the species has 

 reached the limit of its distribution toward the north. 



ANTHOPLEURA DOWII Verrill 



Figure 78, e, f 



Anthopleura dowii Verrill, 1869, p. 474; 1899, p. 44, fig. 8. 



The six specimens in the collection are undoubtedly A. dowii. 

 The color of the tentacles is greenish with light spots in the largest 

 specimen. The exterior is well described by Verrill: "The pores 

 through which water may be ejected" are certainly those of the 

 marginal spherules. The sphincter is almost palmate in the two 

 specimens examined (fig. 78, e, /) . In the largest specimen there 

 are 2 broad siphonoglyphs symmetrically set and strongly pro- 

 longed aborally, 24 pairs of perfect and fertile mesenteries includ- 

 ing the directives and 24 pairs of imperfect, sterile, and filamentous 



