329 von Trìchoniscus anzusehen geneigt ist. Mit Rücksicht auf den Bau der vorderen Antennen und der Mundwerkzeuge sehe ich mich ver-anlaßt, Verhoeffs Ansicht heizustimmen, d. h. Titiianetes \venigsten> als nächsten Verwandten von Trìchoniscus zu betrachten. Wenn die beiden Sarsschen Familien der Ligiidae und Trichoniscidae überhaupt als solche aufrecht erhalten werden können, so muß TitJui-we/es jedenfalls aus der ersteren ausgeschieden und den Trichonis-cidae zugewiesen werden. 3. A new Genus and Species of Solenogastres. By Harold Heath, Stanford University, Calif., U. S. A., Department of Zoology. eingeg. 11. Oktober 1904. Thiele' and especially Nierstraß^ have called attention to the fact that in recent years several new species have been included in the genus Cliaetoderma whose eligibility is exceedingly doubtful. Chaetoderma raduUfera Kow. with its large radula containing nine rows of five teeth each, peculiar "jaws" and small liver is certainly not closely related to Chaetoderma nutidulum the type of the genus, and from all appearances deserves the generic name Prochaetoderma pro-posed by Thiele. The case against Ch. gutterosum Kow., Ch. lovent Nierstr. and Ch. töeVem Nierstr. is not so strong and yet is certain that these species lack several typical characters. In the first place the radula is comparatively complex, consisting as it does of one or two rows w ith several teeth in each row together with a great median tooth and lateral plates. It is possible that some of these so called teeth may subsequently prove to be merely plates for the attachment of muscles that move the teeth or radula supports; but at the present time so great an uncertainty exists concerning these and other matters related to the internal organization of these forms that it seems best not to attempt to revise the classification until we have a more perfect know-ledge of their anatomy. In 1S95 Mr. Cloudsley Rutter, late of the U. S. Fish Com. sent two specimens of solenogastres from Yakutat Bay, Alaska and two years ago a number of additional individuals were taken by the Str. Albatross in Lynn Canal and Chatham Straits, Alaska in water of about 300 fath. depth. In some respects, especially in the arrange-ment of the organs in the posterior end of the body, this species con-1 Die systematische Stellung der Solenogastren und die Phylogenie der Mol-lusken. Zeitschr. f. wiss. Zool. Bd. LXXH. S. 275. 2 The Solenogastres of the Siboga-Expedition. p. 42. — Tseue Solenogastren. Zool. Jahrb. Bd. 18. S. ;i68.
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