136 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Lovenia dumblei, new species. 

 Plate 17, figs. 2a-2c. 



Test of moderate size (anteroposterior diameter, 47.5 mm.; 

 transverse diameter, 46 mm. ; average greatest elevation, 18.5 

 mm.); marginal outline sub-cordiform to sub-oval, slightly 

 angulated. Abactinal surface nearly flat, but with greatest 

 elevation in the posterior portion of the test; odd anterior 

 interambulacral area somewhat ridged. Ambitus of odd an- 

 terior ambulacrum deeply notched ; posterior end truncated. 

 Apical system excentric slightly to the anterior of the center 

 of the test; furnished with four large genital pores crowded 

 together, the two posterior ones being farther apart than the 

 anterior pair; madreporic area extends from between the 

 pores, posteriorly into a lobe. Paired petals of equal length; 

 aborted near the apical system by the internal fasciole; an- 

 terior rows of the pores of the anterior lateral petals form a 

 nearly transverse line. Petals pointed, subtriangular in shape, 

 and curving slightly to the front. Pores large, suboval, and 

 conjugated ; within the internal fasciole, rudimentary petals 

 are present which extend from the apical system to the 

 fasciole, but do not connect with the normally developed pet- 

 als outside. Poriferous areas of equal width for the entire 

 distance. Beyond the ends of the antero-lateral petals a 

 double row of small pores continues past the margin to the 

 peristome. Pores of the odd anterior petal small, obliquely 

 placed, set close together, and located in the center of each 

 plate; they continue from the apical system in slightly diver- 

 gent lines to the ambitus and then converge to the peristome; 

 this system of pores is not interfered with by the internal 

 fasciole. The odd anterior groove is shallow on the upper 

 surface, but becomes more pronounced near the margin and 

 cuts the ambitus in a deep angular notch, passing on the 

 under side to the peristome. Paired petals slightly depressed. 

 Actinal surface slightly concave to the peristome. Amphister- 

 num broad and indistinct in the posterior part, but becoming 

 narrower and more prominent to the anterior, culminating in 

 a well-defined protruding labrum. Peristome situated well to- 

 ward the anterior portion of the test, large and pentagonal in 

 outline ; well defined phyllode present. Periproct large, suboval 



