ANISOSPIRA. 299 



nearly straight. All of the teeth have squarish basal-plates. 

 Centrals with a large mesocone, slightly longer than the basal- 

 plate, ectocones almost obsolete, merely overhanging slightly 

 at the sides. Lateral teeth a little longer, but not wider than 

 the centrals, with a large mesocone and small ectocone. To- 

 wards the margins the basal-plates shorten, as usual, and the 

 mesocones become proportionally somewhat longer. Neither 

 cusp is bifid, even on the outer teeth, and there is nowhere 

 any indication of an entocone (pi. 63, figs. 52, 53, 54, A. town- 

 sendi) . 



The genitalia resemble Eucalodium in the long vas deferens, 

 other characters being common to both Eucalodium and 

 Ccclocentrum. The jaw is like that of Eucalodium, Archego- 

 coptis, etc., being intermediate between the striate and plaited 

 types, but more solid than the latter. The teeth are similar 

 to those of Eucalodium and Ccclocentrum. The axis is a 

 larger tube than in any Eucalodium, but smaller than in Ccclo- 

 centrum. Anisospira is therefore somewhat intermediate be- 

 tween these two genera, Further information is needed on 

 the free retractor muscles, which are not alike in Cocloccntrum 

 and Eucalodium. 



A. RECTICOSTA (Pfr.). Vol. xvi, pi. 11, figs. 83, 84. 



See p. 16. I am informed by Mr. H. Fulton that on open- 

 ing a specimen of recticosta in the Sowerby and Fulton collec- 

 tion, he found it to be an Anisospira. This specimen is 34 

 mm. long, with 8 whorls, the lower four forming a cylindric 

 portion 11 mm. in diarn., those above tapering so that the 

 second whorl has a diam. of 7 mm. The color is waxy-white. 

 The axial lamella makes two volutions. The shell is labelled 

 " Mexico." I am indebted to Mr. Fulton for the foregoing 

 details. The exact locality of the type specimen, from Cunn- 

 ing's collection (vol. xvi, pi. 11, figs. 83, 84, after Philippi) was 

 unknown. The original description is given on p. 16. The 

 species differs from var. townsendi by the longer taper of the 

 spire, and the much greater width of the whorls from suture 

 to suture. Probably the specimens recorded from Cualata, 

 Colima (Wm. Lloyd), belong to var. townsendi. Urocoptis 

 (Brachypodella) reticosta Pfr., H. & A. ADAMS, Gen. Rec. 

 Moll., ii, 177, is a synonym. 



