132 ^Ir. P. S. Abraham on some Genera 



depend, in some degree at least, upon the coloui of the fur. 

 I have referred above to tlie slight importance of this character 

 in determining species ; and the following remarks occur in 

 my description of P. auri'tus (at p. 84, ' Monograph of the 

 Asiatic Chiroptera '): — " Examples from Northern Africa and 

 sandy districts in the neighbourhood of the Mediterranean and 

 Caspian seas are much paler in colour throughout than those 

 from moister countries. This I have frequently observed in 

 sp.'cimcns of bats brought from desert regions." 



Many specimens of a Plecotus with very light- coloured fur, 

 but not otherwise distinguishable from P. auritus^ were 

 obtained by Dr. Stoliczka at Leh . 



7. Rhinolophus euryale'} (Severtzoff), =1 R. ferruni-eqiLinum^ 



Schreber. 



Rhinolophus euryale^ Blasius, has not yet been recognized 

 by other zoologists from any part of Asia north of the Hima- 

 layas; hut R. fer7-um-eqiunum, which it resembles very closely, 

 is abundant in the Himalayan region. Therefore I would 

 suggest that this species, which has been recognized as R. 

 euryale, with doubt, by Dr. Severtzoff, is probably R.ferrum- 

 equinum. 



XV. — Notes on some Genera of Nudihranchiate Mollusca, 

 with Notices of a neno Genus and of some hitherto unde- 

 scrihed Species^ in the Collection of the British Museum. 

 By P. S. Abraham, M.A., B.Sc, F.R.M.S., F.Z.S. 



[Plates VI. & VII.] 



Calycidoris, gen. nov. 



Corpus subdepressum ; pallium ultra caput et pedem extensum, 

 papillis gracilibus obtectum ; tentacula dorsalia laminata intra 

 foraniina retraetilia ; branchiae simplices, laminatoe, in cavitatem 

 subretractiles, anum circumdataj, medialiter in dorso postico 

 positae ; tentacula labialia in velum conjuncta ; lingua angusta, 

 ordinem uncinorum unum undique in longiim exhibens. 



The body is rather depressed ; the mantle ample, extending 

 over the head and the foot and bearing soft conical papillge. 

 The dorsal tentacles are short and laminated, and retractile 

 within sheathless cavities. The branchiaj are simply lami- 

 nate, form a cup round the anus, together with Avhich they 

 are contained in a common mantle-cavity, the wall of the 

 latter being not completely contractile over them. The oral 



