THE MOUjSTT desert REGION 133 



coast. Moore (1909) lists a group dredged from off the 

 coasts of Labrador, Newfoundland, and Nova Scotia, while 

 Mcintosh in his monograph of British annelids (1900-1923) 

 described many of the forms found in American waters. 



The student will find that as a general introduction to the 

 literature, morphology, and taxonomy of this group, Fauvel 

 (1923, 1927), in his monograph of the polychaetes of France, 

 has summarized all of the essential information and has pre- 

 sented it in a very accessible form. Chamberlin (1919) gives 

 an even more valuable discussion of the taxonomy. 



Following a method devised by ]\Iayor and used by Tread- 

 well, the animals were first narcotized in a solution of MgSO^ 

 (154 grams to the liter), and killed in 5 per cent formalin. As 

 soon as dead they were transferred to 90 per cent alcohol until 

 hardened, and then run down to 70 per cent alcohol, to be sub- 

 sequently returned to a stronger alcohol. Storing in 80 or 90 

 per cent alcohol seemed to insure the best preservation. In 

 mounting parapodia, jaws, and other structures for micro- 

 scopic study, the use of Euparal was found to be most con- 

 venient and entirely satisfactory. 



The writer is greatly indebted to Dr. A. L. Treadwell for 

 his kindness in giving freely of his advice and reprints, and 

 for a considerable number of identifications made by him ; and 

 to Dr. J. Percy Moore for reprints. Dr. Waldo L. Schmitt 

 has been most generous in allowing facilities for the study of 

 material at the United States Museum and for the loan of 

 specimens for use during the summer. 



In accord with Dr. Treadwell's advice this subclass has 

 been arranged directly into families follo^ving the order of 

 Chamberlin 's (1919) paper on the 'Albatross' polychaets. 



The following species of this subclass have been found sexu- 

 ally mature during July and August : 

 Polynoidae 



Harmothoe imbricala 

 Gattyana cirrosa 

 Lepidonotns sqiiamatus 

 Aphroditidae 



Aphrodita hastata 



