168 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



pallidis, ad suturas impressis, infra, juxta suturas, spiral! ter bi- vel 

 triliratis, et longitudinaliter clathrato-striatis, ultimo aufractu versus 

 basim attenuato, producto, spiraliter undique regulariter minuti- 

 punetato, punctis arctis, superne pallide gilvo, ad medium et infra 

 cinereo-bruimeo, vel gilvo, delicatissime albo-fissurato lineis divaricatis, 

 fulgetrinis, penultimo bino punctorum ordine, et, simul ac in ultimo, 

 infra suturas rufi-maculato, ultimo apud medium spiraliter albo- 

 maeulato, maculis ad Ifevum rufo-marginatis, simili macularum ordine 

 versus basim succiucto, apertura angusta, oblonga, labro recto, paullulum 

 incrassato, columella quadriplicata, plicis acutis, basi attcnuata. 

 Long. 1 8, lat. 8 mm. 



This is one of the most puzzling species we have ever examined. 

 Combining, as it does, the characters of 2Iitra, Lam., s.g. Sivainsonia, 

 H. & A. Ad., with the genus Imhricaria, Schum. {(.'oimlix, Swn.), 

 we hesitated for some time as to its location. We ultimately decided, 

 on account of the following characters, to place it in the latter 

 genus : — 



(a) The shortly cylindriform shape. 



(b) Btraight outer lip. 



(c) Columellar plications, precisely those of the Tmhricarm. 



{d) Its close approximation especially to I. Vanikorenftis, Reeve 

 (PL XIII, Fig. 10), in form and upper whorls, and in regular spiral 

 punctate markings. 



((?) The base and slightly produced canal of Imbricaria. 



On the other hand, the following characters more closely agree 

 with Swainsonia : — 



{a) Markings. Almost identical with those of Mitra Ilar'm, A. Ad. 

 (PI. XIII, Fig. 8), and M. ocellafa, both from the Andaman Isles, 

 the latter occurring also at Singapore. 



{h) Distance between the sutnre of the penultimate whorl and 

 the commencement of the lip. 



At first it occurred to us that it might possibly be a hybrid 

 between Mitra Marm and Imlricaria Vanikorensis, but this is 

 hardly likely. The latter, to begin with, has never been yet found 

 in the Andaman Isles. Xor do we consider it a monstrosity. 

 It remains to add a very beautiful form to an already circumscribed 

 genus ; though we have always been at a loss to entirely comprehend 

 why the genera Ci/h'ndromitra and Imhricaria have been so completely 

 separated from Mitra. We think it would be more reasonable to 

 only allow them subgeneric rank, as formerly, and as such we venture 

 to include this species. 



[N.B. We may remind malacologists that in 1888 one of us 

 described a Cyprcea (C amphithales), from South Africa, which exactly 

 combined the characters of two subgeneric types — Cyprceovula 

 Capensis, Gray, with Lupo^iia Algoensts, Gray. Several specimens, 

 some in live condition, have come to hand in recent years, and it is 

 impossible to say with certainty with which subgenus this interesting 

 shell should be located ; though we incline to Cyprmovula. The 



