270 bulletin: museum of comparative zoology. 



Ventral area indents epitheca, abruptly widened posteriorly. Ventral pore 

 in apical 2'. Precingular 6" quadrangular; postcingular 1' very narrow; 

 posterior intercalary not extending on antapical horn; antapical 1"" a conical 

 asymmetrical horn. Plate formula 3', a , 6", 6, 6'", 1", 1"". Surface 

 reticulate, pores in corners of polygons. 

 Length 75 mJ transdiameter, 48 ju. 



Sta. 4722. 



GONYAULAX SUBULATA, Sp. IIOV. 



A very small biconical species with overhanging girdle and faint linear 

 markings. Length 1.66 transdiameters. Midbody subrotund, contracted 

 abruptly into a tapering truncate apical horn. Antapex subulate. Girdle 

 descending, displaced 1.6 girdle widths, ends overhanging slightly. Ventral 

 area short, sigmoid, not indenting epitheca, broadly rounded posteriorly, not 

 reaching postmargin. Plate formula 3', 0", 6", 6, 6'", l p , 1"". Apical 1' 

 very narrow; precingular 6" quadrangular; postcingular V" very minute; 

 posterior intercalary not on antapical horn, short and wide; antapical V" 

 conical, exposed ventrally, terminating in a sharp subulate antapical spine. 

 Surface smooth, sparingly marked with linear vermiculations in which lie 

 the few scattered pores. 



Length 48 n; transdiameter 27 n. 



Sta. 



Subgenus Gonyaulax. 



The spinifera group. 



Characterized by several asymmetrical antapical spines, absence of linear 

 markings, and rotund body. 



Gonyaulax areolata, sp. nov. 



A minute rotund species with short apical horn and areolate surface. Length 

 1.15 transdiameters. Rotund, apical horn less than 2 girdle widths high, 

 apex squarely truncate. Hypotheca hemispherical, bearing 2, 3, or more 

 unequal, acute, finned, antapical spines. Girdle descending, displaced 

 scarcely a girdle width, without overhang, with ribbed lists. Ventral area 

 nearly straight, gradually widened distally, reaching postmargin, with spinous 

 lists. Ventral pore in apical 3'. Plate formula 3', 0", 6", 6, 6'", 1", 1"". 

 Apical 1' widened below its middle; precingular 6" quadrangular, post- 

 cingular 1'" narrow; posterior intercalary very wide. Surface minutely and 

 densely areolate, few pores. 



Length, 40 n; transdiameter, 35 p. 



Sta. 4717. 



