278 BULLETIN OF THE 



Genus ADEORBIS Wood. 

 Adeorbis supranitidus Wood. 



Adeorbis supranitidus Wood, Cat. 1842 ; Crag. Moll., p. 137, pi. xv. figs. 5 a, 5 b, 1848. 

 Skenea trilix Bush, Trans. Conn. Acad., VI. p. 464, pi. xiv. figs. 7, 7 a, 1885. 



Adeorbis supranitidus var. Orbignyi Fischer. 



Adeorbis Orbignyi Fischer, Journ. de Conchyl., VI. pp. 173, 286, 1857. 

 Omalaxisl lirata Verrill, Trans. Conn. Acad., V. p. 529, 1882. 

 Skenea lirata Verrill, he. cit., VI. p. 452 ; Bush, VI. p. 464, 1885. 



Habitat. Station 23, off Bahia Honda, Cuba, in 193 fms. Eastern coast of 

 the United States from Florida to Cape Cod, U. S. Fish Commission. Crag of 

 Britain, Wood. Norway, Lofoten Isl., G. 0. Sars. Tangier Bay, Porcupine 

 Expedition. Cedar Keys, Florida, Hemphill. 



This is a very interesting and variable little shell. The normal form figured 

 by Wood and Bush may be taken as the type, from which we have the follow- 

 ing divergent varieties: 1. With one or more of the carinse missing, some- 

 times all. When the latter is the case, some fine spiral striae remain, and we 

 have A. striatus Wood. 2. The carina? maybe indefinitely multiplied; those 

 with numerous cinguli on the upper surface and the base normal are A . lirata 

 Verrill. Those where the base is also invaded are A. Orbignyi. A. Beaui 

 Fischer,* which is found in Florida, is a gigantic repetition of A. lirata, but they 

 can hardly be united. 



Subgenus CLATHRELLA Recluz. 



- o 



Clathrella Recluz, Journ. de Conchyl., 1864, p. 251. 



The difference between the animals described by Recluz shows that Cla- 

 thrella cannot belong to the same group as Fossarus, and a careful study of 

 F. depressus Seguenza, fragilis O. Sars, reticulata S. Wood, and naticoides n. s., 

 has nearly converted me to Dr. Jeffreys's opinion that they are related to 

 Adeorbis, being elevated and turbinate forms of that group. Whether Phasi- 

 anema S. Wood is identical with Clathrella, or Fossarus, or Isapis, I do not 

 feel ready to decide, and leave that question open. 



Clathrella naticoides n. s. 



Shell minute, white, naticoid, recalling Lunatia heros in shape, but with 

 rounder whorls and deeper sutures; whorls four, the nucleus minute, inflated 

 and obliquely set, polished and glassy; remainder of the whorls of a greenish 



* This is also named Cyclostrema bicarinatum by Guppy, Geol. Journ., XXII. 291, 

 1866. 



