254 M, F. cFA. Furtado on Viquesnelia atlantica. 



attached to the anterior end of the uterus, its canal attached 

 (externally) to the oviduct. Vestibule as long as the oviduct 

 (neglecting the convolutions of the latter), variously curved 

 or reduplicate. Penis short, depressed, situate in the middle 

 of the vestibule, bifid, of a delicate yellow-pink colour ; vas 

 deferens entering the anterior lobe*. 



Shell. — I have nothing to add to M. Morelet's description, 

 which is as follows : — " T. ancyliformis, oblonga, planata, 

 rugosiuscula^ longitudinaliter costulata, fulvescens ; spira 

 brevis, lateralis, postica, apice albido." 



Note. — I have not found Viquesnelia atlantica in the 

 gardens of Ponta Delgarda, where it was discovered by MM. 

 Morelet and Drouet. The specimens upon which this memoir 

 is founded were caught on Oct. ol, 1880, on the mountains 

 near 7 Cidades, near the aqueducts of Muro do Carvao and 

 Muro das 9 Janellas, on stones and overturned masses of 

 Sphagnum. Specimens collected in the same neighbourhood 

 in the month of May had the albuminiparous gland so slightly 

 developed that it was necessary, in order to complete the 

 study of the reproductive organs, to wait for the breeding- 

 season ; in May the spermatheca was so small as to escape 

 observation. 



EXPLANATION OF PLATE XIII. 



Viquesnelia atlantica. 



Figs. 1, 2. Animal (iiat. size). 



Fig. 3. Occasional attitude when beginning to creep. 



Fig. 4. Tail-end (magnified). 



* [It will be seen from M. Furtado's description that Viquesnelia is 

 similar in anatomical structure to Limax and the allied genera. The 

 mandible connects it with Vitrina, Hyalina, and Limax ; and it would go 

 with those genera into Morch's " Oxygnatha ' ("maxilla la3vis, acie 

 simplici "). It can hardly be doubted, however, that too much stress 

 has been laid upon characters taken from the mandible. This is inci- 

 dentally shown by M. Fm-tado in a paper entitled " Indaga^oes sobre 

 a complicaQao das Maxillas da alguns Helices uaturalisados nos Azores " 

 (Lisbon, 1880), in which he shows that in Azorean examples of Helix 

 pisana, lactea, and aspersa the mandible is singularly variable and often 

 differs conspicuously from Moquin-Taudon's description of the same organ 

 in European specimens of what are believed to be the same species. The 

 lingual ribbon seems to connect Viquesnelia with TestaceUa, to which it is 

 otherwise only remotely allied. It is hardly possible at present to discuss 

 the exact place of Vitrina and Viquesnelia in the long chain of genera and 

 subgenera which intervenes between Limax and Helix, though they seem 

 to approach the first genus rather than the second. Much anatomical 

 research is required to define these forms and discover their mutual rela- 

 tions ; and M. Furtado's paper is a welcome addition to the materials 

 already collected. — M.] 



