580 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 20, 



This shell, near in general shape to A. glandina, is distinguished 

 by the enamel which is spread over the spire being regularly and 

 distinctly spirally striated or grooved, aud by the strong parietal plait. 

 In some examples the spiral grooving covers the whole of the whorls ; 

 but in others the greater part of the last whorl is smooth. The 

 columella is grooved in a similar manner. 



Lower Miocene, Manzanilla, Trinidad. 



3. PiCULA CAEBASEA, SpCC. UOV. 



Shell pyriform, somewhat ventricose ; spire short, scarcely elevated; 

 whorls 5, ornamented with equidistant raised spiral lines, of which 

 there are three finer between every two of the larger lines, their 

 interstices being cancellated by numerous fine subequal raised lines, 

 which scarcely rise upon the spiral ones ; suture sunk ; aperture 

 ovate, wide, nearly as long as the shell. 



This species closely resembles F. clathrata, Lam., from which it is 

 distinguishable by the ornamentation. 



Trinidad (Caroni Series); Anguilla. 



4. Melakopsis capula, spec. nov. 



Shell ovate-turreted ; spire conical, sharp ; whorls about 7, regu- 

 larly increasing, ornamented superiorly with fine costae, becoming 

 obsolete on the last whorl, which forms more than half the length of 

 the shell ; suture linear, impressed ; aperture ovate ; outer lip sim- 

 ple, prominent ; collumella twisted ; canal short and broad. 



I do not know of any form resembling this species, which was 

 probably not a freshwater shell. It may possibly have been an 

 estuarine form. It reminds one of a shortened and widened Eulimaj 

 or even a Stylifer. 



Upper Miocene, Cumana. 



5. Ttieeitella toek-ata, spec. nov. 



Shell turreted, elongate ; whorls numerous, increasing very gra- 

 dually, ornamented with two spiral keels, each bearing a monili- 

 form row of granules ; the upper keel accompanied by a granular 

 line halfway between it and the linear suture ; the rounded conca- 

 vity between the keels having also two fine linear spiral rows of 

 moniliform granules ; aperture subquadrate. 



Upper Miocene, Cumana ; Jamaica ; San Domingo. 



6. Coebula vieta, spec. nov. 



Shell subtrigonal, nearly equilateral, rounded at both extremities, 

 scarcely truncate posteriorly ; right valve turgid, ornamented with 

 numerous stout, rounded, concentric costae ; umbones prominent. 



This shell is variable as to height, small examples approaching in 

 form to C. elevata, Conr. It appears to be most closely allied to 

 C. gibha and C. pisum, from which it is distinguished by its greater 

 size and stouter concentric ribs, of which there are between thirty 

 and forty on the large valve of well-grown examples of C. vieta. It 

 is also less truncate posteriorly than the species mentioned. 



