38 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Type locality, Mazatlan, Mexico, 23°19'00"N, 106°23'00"W, inter- 

 tidal, two colonies, Miss A. E. Blagg, collector. Also taken at Hancock 

 Station 341, three colonies, Secas Islands, Panama, 7°53'10"N, 82° 12' 

 05''W, 30 fms. 



Electra bellula var. bicornis (Hincks), 1881 



Membranipora bellula var. a (bicornis) Hincks, 1881a:149. 

 Electra bellula var. bicornis, Hastings, 1930 :706. 



This is a thin-walled, rather delicate species with a small, short, 

 median spine proximal to the opesia. The variety bicornis, in addition to 

 the median spine, has a longer forked or branched spine on either side 

 of the central one, bending forward over the opesia, (the median spine 

 sometimes wanting) . 



The species and variety have a wide distribution. It did not occur in 

 the Hancock dredgings, but Dr. Hastings has recorded it from the Ga- 

 lapagos Islands. 



Electra hastingsae Marcus, 1938 



Electra hastingsae Marcus, 1938 :17, synonymy. 

 Electra monostachys, Hastings, 1930:706. 



(Not Me?nbranipora monostachys Busk, 1854, and numerous later au- 

 thors). 



This species has been confused with Electra {M embranipora) crustu- 

 lenta (Pallas), the variety with a single proximal spine, which it re- 

 sembles, but in that form there is a well-calcified operculum often of 

 striking white appearance, while in hastingsae the operculum is entirely 

 membranous. There is usually a pair of small distal spines opposite the 

 operculum and some small marginal spines; the single proximal spine is 

 smaller and not as much enlarged at the base as in crustulenta. 



This species was not found in the Hancock collections, but Hastings 

 recorded it from Balboa, Canal Zone, along shore. It is a common species 

 along the shores of western Europe and eastern North America, and 

 Marcus records it from Santos Bay, Brazil. 



Family Flustridae Smitt, 1867 



The zoarium is erect, free, frondose and flexible with little calcifica- 

 tion (rarely encrusting and loosely attached). Zoopcia membraniporine, 

 the opesia occupying all or nearly all of the front; walls thin, usually 

 with uniporous septules. Avicularia interzooecial, usually simple and 



