780 SCIENTIFIC RECORD FOR 1885. 



For further details, reference must be had to the original memoir of 

 Hilger, ])ublished in the Morphologische Jahrbuch, and a fuller abstract 

 in the Journal of the Royal Microscopical Society. {Morphol. Jahrb., 

 V. 10, pp. 351-371, 2 pi. ; J. B. M. S. (2), r. 5, pp. 222, 223.) 



The relations of Sequenzia. — The small moUusks to which the generic 

 name Sequenzia has been given, and which, on account of the appear- 

 ance of the shell, have been supi)osed to be related to the Solariids by 

 some, and by others to the Trochids, have, it seems, been quite misun- 

 derstood. Prof. A. E. Verrill found in the dredgings of the United 

 States Fish Commission living examples of the genus, and, on exami- 

 nation of the radula and jaws, determined the affinities of the form to 

 be quite different. Professor Verrill approximates the genus (which he 

 raises to the rank of a family) to the Aporrhaidae, and consequently in 

 the group or suborder of Tasnioglossa instead of the Ptenoglossa or 

 Rhipidoglossa. 



The family is definable as Tainioglossates with ovate jaws having a 

 tesselated surface and denticulated edge; teeth of the central row small 

 and with a denticle, of the inner lateral smaller and with curved, unarmed 

 tips, and of the two outer lateral slender, sharp, and strongly curved; 

 shell trochiform,its aperture irregular, with a posterior sinus and a short 

 or rudimentary canal or sinus, with a pearly luster, and decussating 

 sculpture, and operculum thin, rounded-ovate, with a subcentral nucleus 

 and five concentric lines. (Trans. Conn. Acad. Arts & Sci., v. 6, pp. 

 186-191.) 



The animal ofAdeorhis. — There is a small shell, of a discoid form, found 

 along the European coasts, as to whose relations there have been con- 

 siderable doubts ; its generally accepted name is Adeorbis subcarinatus. 

 The doubts as to its aflBnities could only be solved 'by an examination 

 of the anatomy of the animal. This has been undertaken during the 

 past year by Mr. Paul Fischer. He found that the radula has sixty- 

 eight transverse rows of teeth, each row consisting of seven teeth ; the 

 central is wide and trapezoidal, and has a reflected summit and basal 

 cusps ; the lateral teeth are rhomboid and each has a long, stolk-like 

 lateral process ; the inner marginal are long, narrow, and denticulated 

 along its external margin; the external still narrower and with entire 

 margins. It appears, therefore, that Adeorbis has no relations with the 

 Trochids or Cyclostrematids to which some conchologists have been dis- 

 posed to refer it, and that its affinities are really with the Skeneids and 

 Rissoids, as has been long suspected by others. (Trans. Conn. Acad. 

 Arts & 8ci., V. 6.) 



The relations of Truncatella. — Along the shores of many countries be- 

 tween tide-marks or even above normal high-water mark are found cer- 

 tain small moUusks having an elongated turreted shell, truncated at 

 the summit, and with a subcircular aperture. These raollusks belong 



