360 MOLLUSCA. 
numerous yellow streaks, some of which are comparatively broad and even confluent. Inside of the 
aperture and columellar margin as in typical P. ompluviata. 
Long. 26, diam. 15; apert. long. 204, lat. 84 millim. 
» 24, 4, 133; » 20, 5 8 4, 
Hab. N. Guatemata: Vera Paz (Salvin 1). 
This form is almost intermediate between P. impluviata, var. bocourti, and P. nitens, 
var. gracilenta. ‘The comparative breadth of the shell in relation to its length is 
somewhat variable also in this form, as may be seen by the two figures here given. 
Var. gracilior, n. 
More narrow in comparison with its length, whorls less convex, sometimes even subangulated a little below 
the suture; yellowish-brown, some specimens with a few narrow white rays; columellar margin nearly 
straight, thick, white, above somewhat purplish, 
Long. 22, diam. 103; apert. long. 15, lat. 6 millim. 
99 22, 99 10 5 99 15, 99 6 99 
” 23, » 12; ” 16, ,, 63 ” 
Hab. Cuntrau Costa Rica: environs of San José (Biolley); Costa Rica, without 
nearer indication of locality (Karl von Seebach, in Mus. Berol.). 
Beck [Index Mollusca, p. 116 (1837)]| mentions an Aplecta ventricosior from Panama, 
without description ; but I have not been able to obtain any information about it, even 
from the conchologist of the Copenhagen Museum. To judge from the name, it may 
perhaps be referable to P. impluviata. 
5. Physa fuliginea. 
Physa fuliginea, Morelet, Test. Noviss. ii. p. 16 (1851) '. 
Aplecta fuliginosa (Morelet), Fisch. & Crosse, Miss. Scient. Mex., Mollusca, ii. p. 89, t. 30. 
fige. 5, 5a’. 
Darkish brown, with rather short spire; columellar margin thick, somewhat twisted, brownish. 
a. Long. 17, diam. 9; apert. long. 12, lat. 5 millim. 
b. 29 14, 99 73 > 29 10, 39 4 99 
a. Measurements given by Morelet and Fischer and Crosse; b. Smaller specimen from among those in 
Morelet’s collection. 
Hab. N. Guaremata: San Miguel Tucuru (Bocourt * 2), 
W. GUATEMALA: Antigua, in small streams (Morelet } 2). 
Centra Costa Rica: Cartago and San José (Biolley, in Muss. Berol. and Neuchétel). 
Var. hoffmanni, n. (Tab. XX. figg. 5, 5 a, 6.) 
Physa nitens, var. minor, Strebel, Beitr. Mex. Land- und Siissw.-Conch. i. p. 50, t. 6. fiz, 25 f° 
Pale greyish-horn-colour, somewhat narrower than the type. 
* Given by Bocourt as San Miguel Tucusan, no doubt in error for San Miguel Tucuru, in the Polochic 
Valley. 
