36 TRANSACTIONS OF THE WAGNER FREE 



This species is rather peculiarly sculptured and I do not recall any recent 

 species resembling it. 



Drillia leucocyma Dall. 



Drillia leucocyma Dall, Proc. U. S. Nat. Mus. vi. p. 32S, pi. 10, fig. 8, 1S83. 

 Drillia zebra var. Tryon, non Lamarck, Man. vi. p. 197, pi. 34, fig. 2, 1884. 



Caloosahatchie beds. Recent, shores of the Gulf of Mexico from Florida 

 to Yucatan, in 3 to 5 fathoms. 



This species belongs to a large group which are without doubt related. 

 As a well-marked combination of certain characters not directly intergrading 

 with its neighbors, I prefer to retain it in specific rank. 



Drillia albomaculata Orbigny. 

 Pleurotoma albomaculata Orb., Moll. Cuba, II. p. 176, pi. xxiv. figs. 16 to 18, 1842. 

 Pleurotoma albopustulata Smith, Ann. Mag. Nat. Hist. 1882, p. 211. 

 Drillia zebra var. Tryon, Man. vi. p. 197, pi. 14, fig. 11, 1S84. 



Caloosahatchie beds. Recent, Florida and the West Indies. 



This is one of the forms related to but distinguishable from the preceding 

 and found in similar situations. 



Drillia (lissotropis var. ?) perpollta Dall. 



Plate 2, figure 2. 



Pleurotoma lissotropis Dall, Bull. Mus. Comp. Zool. i.x. p. 58, Aug. 1881 ; Rep. Blake Gastr , 



p. 91, pi. xi. figs. 3, 4, 1889. 

 Pleurotoma ^y/j^/a Watson, Journ. Lin. Soc. xv. p. 433, Oct. 1881 ; Chall. Gastr., p. 341, pi. 



xxi. fig. 4, 1885. 



Type, recent in the Gulf of Mexico and West Indies in 73 to 24S 

 fathoms. 



Wdintty perpolita. Fossil in the Caloosahatchie beds. 



This shell differs from the recent D. lissotropis in the entire absence of the 

 fine spiral striation which in nearly all specimens o{ lissotropis is visible between 

 the ribs. It is uniformly stouter, the ribs are more widely separated and 

 flexuous. The anal fasciole forms a moderate constriction which nearly cuts 

 off the ends of the ribs where they abut on the suture behind them; these 

 ends have therefore somewhat the appearance of a row of nodules. • In D. 

 lissotropis the fasciole is hardly perceptible, the ribs appear continuous and less 

 sharp-edged than m perpolita. I consider it probably specifically distinct from 

 D. lissotropis, which is, however, its nearest relative. The max. Ion. of D. 

 perpolita is 9.75 ; max. lat. 3.0 mm. 



Drillia (lissotropis var.) scissurata Dall. 

 This form is rather stout, like D. perpolita, but with more oblique and, on 

 the last whorl especially, more crowded and narrower ribs; the fasciole hardly 

 constricts the whorl, which slopes from the suture forward so that its widest 



