4 BULLETIN 104, UNITED STATES NATIONAL MUSEUM 



raphy, Tech. Ser., vol. 1, 1927, p. 159. — Casasnovas, Not. Y Res. Inst. 

 Esp. Ocean., ser. 2, No. 29, 1928, p. 6. — Hehon-Allen and Earland, 

 Journ. Roy. Micr. Soc, 1930, p. 178. 



Test tj^pically free, rarely adherent, planispiral, consisting of pro- 

 loculum and long coiled, tubular second chamber, the later coils often 

 somewhat uneven and not entirely planispiral, the tubular chamber 

 overlapping slightly more on one side than on the other, sometimes 

 flattened, periphery rounded; wall calcareous, coarsely pitted, thin; 

 suture depressed; aperture formed by the open end of the tube. 



Diameter up to 0.50-0.60 mm. 



Ehrenberg originally described this species from off the Coast of 

 Mexico, near Vera Cruz. I examined the type in the Ehrenberg 

 collection in Berlin and the drawing given by Ehrenberg, and copied 

 here (pi. 1, fig. 1) is an excellent one of the type specimen. The 

 species is a fairly common one in the West Indian region, and, as the 

 above references show, has been widely recorded elsewhere. 



Whether or not the species has any such wide range as is indicated 

 by the references is doubtful, and few of them are accompanied by 

 figures. The figures given show the typical form and appearance of 

 this species in the West Indian region from which it was described. 



Spirillina vivipara — Material examined 



SPIRILLINA VIVIPARA Ehrenberg, var. DENSEPUNCTATA, new variety 



Plate 1, figures 5 a, b 



Variety differing from the typical in the broader coils which are 

 ornamented by very numerous, fine, and evenly spaced perforations. 



Diameter, 0.35 mm. 



Holotype of variety (Cushman Coll. No. 12877) from Largo Shoal, 

 San Juan Harbor, Porto Rico, at a depth of 7 feet. 



This may be specifically distinct, but material in sufficient quantity 

 is not available for studv. 



