156 LAND AND FRESHWATER 
Wesel of Hamburg. The Vitrina in question must therefore have 
been from the latter.....I see that the specimen in question came 
to me in 1870.” Monsieur A. Issel has very kindly given me the 
information that, during his trip into the Bogos country, he only ob- 
tained V. caillaudi and Isseli, and Helicariom lymphaseus and pallens, 
but not V. riippelliana ; therefore Mr. Damon could not have received 
it from him. He continues, the two species of Helicarion were pre- 
served by me in spirit, but that on looking for them in the Museo 
Civico di Storia Naturale, Genova, only the shells remain, the animals 
having probably decayed and the shells removed from the tubes. 
The animals of these two species of Helicarion are thus described 
by Morelet (7. ¢.) :— 
HELICARION LyYMPHASEUS, Morelet, t. ix. f. 4. 
“ T’animal est épais, finement grenu, d’un fauve livide, couleur de 
fer sur le dos; le pied, nettement tronqué, est percé d’un pore 
assez large que l’on voit 4 l’ceil nu. Le plan locomoteur est separé 
du corps par un sillon. 
“ Testa depressa, tenuissima, nitida, hyalina, pallide fulva, in- 
equaliter arcuato-striata ; spira planulata, vertice obtusa, vix pro- 
minula ; sutura strictissime marginata; anfr. 3, superne plani, 
subtus convexi, ultimus celeriter crescens, subelongatus ; apertura ob- 
liqua, oblonge ovalis, bast rotundata, marginibus rectis, parallelis, 
“Diam. maj. 13, min. 9, altit. 6 millim.” 
HELICARION PALLENS, t. 1x. f. 5. 
‘“‘ T’animal ressemble tout 4 fait au précédent; le lobe postérieur 
du manteau est marqué d’un ligne couleur de fer dans le sens longi- 
tudinal. 
“« T', superne depressa, subtus turgidula, tenuis, striolata, nitida, 
pellucida, pallide straminea ; spira brevis, obtuse rotundata ; anfr. 3, 
convexiusculr, ultimus amplus, jucta suturam marginatam radiatim 
obsolete plicatus ; apertura perobliqua, lunato-ovalis, margine colu- 
mellari arcuato nec membranaceo. 
«Diam. maj. 12-13, min. 8, altit. 5 millim.” 
Both found in the Bogos country by Messrs. Issel and Beccari. 
From the dark line on the left shell-lobe of Mr. Damon’s specimen 
(Plate XLII. fig. 2) I believe it to be this last species. 
While these sheets are passing through the press, I have just 
received two more specimens from Mr. Damon, As regards the 
animal, they agree with H. pallens, but in the size and form of the 
shell better with H. lymphaseus. Monsieur Issel will, I hope, do 
me the favour of settling the true identification, after a comparison 
of these specimens with the types at Genoa. It may possibly be a 
new species. In both specimens the whorls are irregularly wound, 
the last contracting and covering over the second. 
