COCHLIOPA. 429 
middle course of the Rio Pamare, Pacific slope, Dec. 1891; Rio Punta Mala, 
20 metres above the sea, April 1892 (Pittier). 
Pittier’s two specimens are smaller than those from Nicaragua, but I cannot see any 
other difference. 
3. Cochliopa trochulus, sp. n. (Tab. XXIII. fig. 2.) 
Testa trochiformis, subanguste umbilicata, striatula, viridi-fusca, apice nigricante, sulcis spiralibus- paucis 
_vel nullis, carina acuta utrinque impresso-marginata, usque ad aperturam persistente; anfr. 44, parum 
convexi, sutura mediocri, interdum subgradata discreti, ultimus basi planatus ; apertura diagonalis, 
piriformis, margine externo tenui, columellari crassiusculo, subreflexo, callo perlato margines jungente, 
fauce ceerulescente. 
Diam. maj. 5-6, min. 43-5, alt. 4-5; apert. diam. 3-33, alt. obliqua 4 millim. 
Hab. S.W. Costa Rica: Rio Grande de Terraba, at El Pozo, in gravel, 25-50 metres 
above the sea, March 1892, and marshes of Sierpe, on aquatic plants, April 1892 
(Pittier) ; El Pozo, Dec. 1892 (Biolley). 
This species is very near the preceding, but differs from it in having a sharp keel in 
the periphery, limited on each side by a visible depression which reaches the aperture ; 
while C. ¢ryoniana has a somewhat prominent line at the commencement of the last 
whorl only, the latter being simply angulated. Moreover, in C. trochulus the whorls 
are less convex on the upper side and flatter on the lower side, the umbilicus is 
narrower and more distinctly circumscribed, and the spiral furrows are scarcely 
visible. The colour is almost alike in both, except that in well-preserved specimens of 
C. trochulus the apex is usually blackish-violet (in C. tryoniana pale greenish), and in 
full-grown ones the peristome is furnished with a blackish edge. J have examined 
twenty-two specimens of C. trochulus of different ages, and fourteen of C. tryoniana, 
and find that the above-mentioned differences are fairly constant in specimens from the 
same locality; but it is quite possible that intermediate forms will be found. 
4, Cochliopa (?) infundibulum, sp. n. (Tab. XXIII. fig. 3.) 
Testa pyramidata, perspective umbilicata, leviter spiratim sulcata; anfr. 5, gradati, valde convexi, ultimus 
infra suturam planatus et radiatim incisus, umbilico lato, distinctius spiratim sulcato, angulo circumdato ; 
apertura valde obliqua, piriformis, peristomate continuo. be 
Diam. maj. 32, min. 33, alt. 4; apert. diam. 2, alt. obliqua 14 millim. 
Hab. Guaremata (Mus. Berol.). 
Two bleached specimens of this shell have been sent to the Berlin Museum 
by H.v. Ihering. It is doubtful if they belong really to the genus Cochliopa ; but 
the pear-shaped aperture, the slightly thickened columellar margin, and the spiral 
sculpture give them somewhat the appearance of the preceding species. It may be a 
lacustrine form, perhaps from the Lake of Peten. 
