KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 26. N:0 2. 103 



narrow, with a ro\v of large grannles, formed by the continiTation of the costaä. Costse 3 to 4 in 

 0,0 1 mm. altei'iiating with donble rows of coarse piincta. Luiiulitt noiie or narrow. Ocelli forming 

 a marginal band, and, besides, a band along the furrows or lunulpe. 



This species, which is intermediate between 1). Cro.b)-o and D. vagabunda, differs from D. 

 Crabro in nothing bnt the donble rows of ocelli. The form of the val ve is variable, nsnally 

 elliptical, bnt in some specimens pandnriform. The Innula:'. are indistinct in some forms, narrow in 

 others. It would be admissible to group the forms of this species together with the forms of D. 

 Crabro. The rar. Kinl^eriana and galapagensis are analogous to the Pandnra-series, the var. lata 

 to the separabilis-series. 



Var. Galapagensis Cl. — V. not constricted, elliptical. L. 0, 12; B. O, os mm. Costre 4 in 

 0,01 mm. alternating with donble rows of coarse pnncta. Limnlaj very narrow. Ocelli forming a 

 marginal and an interiör row. — Pl. II f. l(i. 



Marine: Galapagos Islands! 



Var. lata Cl. — V. elliptical, not constricted. L. 0,ii; B. 0, 048 mm. Costse 4 in 0, 01 mm. 

 LnnnlfB moderately broad. — Pl. II f. 14. 



Marine: Galapagos Islands! 



The fig. 12 Pl. CLXXIV in A. S. Atl. represents donbtless a small, bnt strongly corroded 

 form of D. biseriata. 



80. D. vagabunda Brun (1892). — V. pandnriform with tongne-shaped segments. L. 0, 13 

 to 0,17; B. 0,06; at the constriction 0, 043 mm. Central nodnle large, qnadrate; its horns nearly 

 parallel. Furrows narrow, linear, with a row of large grannles. Lnnnlse very narrow or not di- 

 stinct. Costee 3 to 4 in 0, 01 mm., alternating with double rows of coarse puncta. Ocelli forming 

 a marginal band and several obliqne or curved rows besides. ■ — Nav. vagabunda Brdn A. S. Atl. 

 CLXXIV f. 5. Dipl. vag. Icon. n. Pl. II f. 13, 15. 



Marine: Tamatave (Kinter CoU.)! Fossil: S:ta Monica, S:n Pedro (Kinker CoU.) Calif. ! 

 D. vagabimda is a transitional form from JD. biseriata to D. gemmatula (rar. Beyrichiana). 



81. D. prisca A. S. (187.5). — V. slightly constricted, with tongne-shaped or cnneate, 

 obtuse segments. L. O.o: to O, os; B. 0,029 to 0, 03 mm., at the constriction 0, 02 to 0,027 mm. 

 Central nodnle qnadrate; its horns parallel and approximate. Furrows narrow, linear, with a row 

 of lai-ge pnncta. Transverse costfe 7 to 8 in 0, 01 mm. alternating with donble rows of puncta, 

 about Ifi in O.oi mm. and ocelli, 4 to .5 in 0, 01 mm. — Nav. prisca A. S. Atl. Pl. XII 

 f. 66 to 68 (69?). 



Marine: Nottingham (Maryland)! Atlantic City, N. Jers. (Grove CoU.), Richmond, Va! 

 always fossil. 



This species is very nearly akin to D. gemmatula from which it differs by the narrow 

 furrows. The exteriör stratum with small alternating puncta is usually preserved in JD. prisca, 

 bnt never fonnd on D. gemmatula, which may be a conseqnence of the state of preservation and 

 preparation. 



82. D. gemmatula Grun. (187.5). — V. slightly constricted, with tongne-shaped to broadly 

 cuneate segments. L. 0, 07 to 0,15; B. 0, 033 to 0,062; at the con.str. 0,027 to 0, 05 mm. Central 

 nodnle large; its horns almost parallel. Furrows nsnally broad, and somewhat dilated in the 

 middle, with a row of large piincta. Costse 5 to 7 in 0, 01 mm. alternating with rows of more or 

 less numerons, large ocelli. 



Var. hungarica Cl. — • V. moderately constricted. L. O.os; B. 0,025; at the constr. 0,oi8 

 mm. Ocelli forming one row along the margin and one along furrows. 

 Marine: Szåkal, Hungary, fossil! 

 Akin to Nav. expedit a A. S. (Atl. LXIX f. 6) from Moron. 



