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. 



