104 K. J. Bush — Marine Gastropods referred to 



rounded above but decidedly angular below, with the base flat and 

 appearing somewhat concave. The umbilical region is of consider- 

 able size, with a comparatively email but deep opening, which is not 

 in the center of the base, owing to the abrupt enlargement of the 

 whorls. The aperture is large, very oblique, somewhat angular, so 

 that when the shell rests on the base the spire is considerably tilted. 

 The sculpture consists, on the body-whorl, of four to six unevenly 

 elevated, unequally separated carinse, which are crossed by very con- 

 spicuous, elevated, irregular, oblique, somewhat sinuous lines in the 

 direction of the lines of growth ; these considerably roughen the 

 entire surface from the suture over the base well up into the umbil- 

 icus. The suture is defined by a much roughened carina which rests 

 well up on the preceding whorl. The nucleus is regularly coiled, 

 smooth and shining. Some specimens are very glassy and some are 

 stained by oxide of iron. 



Nothing seemed to be known of the animal or operculum until 

 1865, when Mr, Jeffreys described the latter (B, C, vol. iii, p, 317) 

 as "paucispiral, horny, with lateral nucleus," and suggested the near 

 relation of the genus to Solarium. In 1869 (B. C, vol. v, p. 216), he 

 mentioned a specimen as having been found with the animal which 

 is of a very red color. In 1885 (" Proceedings of the Zoological 

 Society" of London, for January, p. 40), he again mentioned the 

 animal and referred to the descriptions given by Mr. Duprey in the 

 " Annals and Magazine of Natural History," London, for October, 

 1876. Mr. Duprey stated that he had had several animals alive for 

 some time and had studied their habits and characters with great 

 care. The following is an abstract of his description : 



Animal white, with a pinkish hue, semi-transparent, easily con- 

 tained in the shell. Snout rather long, extensile, cloven at the tip. 

 Tentacles long, extensile, blunt, diverging. Eyes very small, at out- 

 ward base and a little behind the tentacles. Foot slightly notched 

 in front, square behind. Gill comblike, on right side of body. 



Unfortunately the odontophore of the type has never been studied, 

 so that the true relation of the genus is still doubtful. 



List of species belonging to the marine fauna of eastern America 

 which have been referred to Adeorbis : 



Adeorbis Bea\di Fischer, A. Orblgnyi Fischer, A. Adamsi 

 Fischer, A. lirata (Verrill) Dall, A. siqoranitidus Wood = A. trilix 

 (Bush) Dall, A. striatus Wood = sp, ?, A. elegans A, Adams, A. 

 ( Clathrella) naticoides Dall, A. nautiliformis Holmes = Cochlio- 

 lepis parasitica Stimpson, A. olivaceus (Verrill) Dall, A. cosiidata 

 (Moller) Verrill = Molleria costulata (Moller) Jeffreys, A. inornatum 

 (d'Orb.), A. cyclostomoides Pfr. 



