ACTINIANS OF GULF OF CALIFORNIA— CARLGREN 421 



the latter not examined in regard to directives) ; tvv'o individuals 

 from Puerto Escondido are provided with three and six siphono- 

 g-lyphs, only one joined vv^ith directives. There are numerous per- 

 fect mesenteries ; I counted 46 pairs in one specimen. There are 

 more mesenteries at the base than at the margin. The retractors 

 of the mesenteries are diffuse and not strong, the parietobasilar 

 muscles distinct. The nematocysts of the marginal spherules are 

 partly 32.4-48.6 by 4.2-5.5 fx (32.4-42.3 by 4.2-5 ^, 38-47.9 by 

 5.5 fjL, 39.5-47.5 by 5-5.5 fi, 39.5-48.6 ^) (atrichs), partly 24-25.4 by 

 2.8 IX (few basitrichs in the one individual examined) ; those of 

 the vesicles 16.9-31 by 2.5-4.2 fi (basitrichs, probably two kinds) ; 

 those of the tentacles 24-29.6 by 2.8-3 /a (basitrichs) ; those of the 

 actinopharynx partly 23.3-33.8 by 3-3.5 /., partly 12.7-16 by 2.2- 

 2.8 fx (both basitrichs) ; those of the filaments partly 11.3-17.6 by 

 1.5-2.2 fi, partly 32.4-38.8 by 5-7 jx (both basitrichs), and partly 

 19.7-26 by 4.2-5.6 /x (microbasic 2J-niastigophors in 12 specimens 

 from Tiburon Island and Point Lobos examined). 



Measurements. — The very contracted specimen from Point 

 Lobos, oral disc 4 cm., height 1.7 cm. ; an individual from Angeles 

 Bay, breadth 4 by 2.5 cm., height 1.3 cm. 



Cotypes. — Three specimens, U.S.N.M. No. 49447, Puerto Es- 

 condido, March 26, 1940. 



Collecting records. — Point Lobos, Espiritu Santo Island, March 

 20, 1940, 1 specimen ; Angeles Bay, rocky coast, April 1, 1940, 

 3 specimens ; south of Tiburon Island, April 3, 1940, 1 specimen. 



Remarks. — The species is undoubtedly nearly related to Bunodo- 

 sovia (Eucladactis) grandis (Verrill), to which I was at first 

 inclined to refer the present specimens, but as ginndis has smaller, 

 very closely set, and more compound vesicles and very numerous 

 tentacles (according to Verrill more than 500 in a large specimen) 

 I think it is best to propose a new species for our specimens. 



BUNODACTIS MEXICANA. new species 



Figure 79, a 



Pedal disc wide. Column, except for a short part of the limbus, 

 provided with longitudinal rows of verrucae, which are more or 

 less compound at the shallow fosse. Sphincter endodermal, pin- 

 nate-circumscribed. Tentacles up to more than 100, short, conical, 

 hexamerously or irregularly arranged. Two distinct but not broad 

 siphonoglyphs, symmetrically set or not, slightly prolonged 

 aborally or not. Mesenteries regularly or irregularly arranged. 

 Most of mesenteries perfect and apart from the directives fertile. 

 Sterile mesenteries seemingly at the base. Retractors bandlike but 



