THE MOUNT DESEKT REGION 129 



LITEEATUKE 



Graff, Ludwig von 1911 Acoela, Ehabdocoela und Alloeocoela des Ostens der 

 Vereinigten Staaten von Amerika. Zeits. wiss. Zool., Bd. 99, S. 321- 

 428, 6 pi. 



Hyman, L. H. 1931 Studies on the morphology, taxonomy, and distribution of 

 North American triclad Turbellaria. IV. Recent European revisions of 

 the triclads, and their application to the American forms, with a key 

 to the latter and new notes on distribution. Trans. Amer. Micro. Soc, 

 vol. 50, pp. 316-335, 1 pi. 



Manteb, H. W. 1925 Some marine fish trematodes of Maine. Jour. Parasit., 

 vol. 12, pp. 11-18, 1 pi. 



Stringer, C. E. 1918 The free-living flatworms (Turbellaria). "Ward and 

 Whipple: Fresh-Water Biology, pp. 323-364, 62 fig. 



WiLHELMi, J. 1909 Tricladen. Fauna Flora Neapel, monogr. 32, pp. i-xii, 

 1-405, 16 pi., 80 fig. 



NEMERTINEA 



Following the view of Dr. A. L. Treadwell (in litt.) this 

 group is treated as a phylum. Such a treatment introduces 

 certain problems of internal classification which we do not 

 feel qualified to solve, and so we have passed directly to the 

 orders without attempting to arrange the group in classes. 



Order HOPLONEMERTEA 



Amphiporidae 

 Amphiphorus Ehrenberg 



A. ANGULATus (0. F. Mullcr). (Verrill, 1892, p. 10, pi. 33, 

 figs. 1, la, 2.) The species ranges in length here from 11 to 

 140 mm. It is most abundant in the shell beach which forms 

 a part of the Nubble, but has also been dredged. Stations: 

 D 146 ;S 43, 48, 49. 



Tetrastemmatidae 

 Tetrastemma Ehrenberg 



T. CANDiDUM (0. F. Mtiller). (Mcintosh, 1874, p. 167, pi. 

 11, figs. 2, 3 ; Verrill, 1892, p. 25, pi. 33, figs. 9-lOa ; pi. 35, figs. 

 9, 10.) Rather common among algae at low tide. Sexes are 

 mature during August. Station : S 49. 



