lO SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



segmentally arranged ventral ganglia. There is considerably less 

 fusion of the ganglia of the head than in other groups. 



Occurrence. — Of five beaches examined in the vicinity of Woods 

 Hole, Mass., Derocheilocaris typicus was found only in Nobska Beach 

 near the town of Woods Hole and in a beach 5 km. east of Woods 

 Hole near the town of Falmouth. About 50 mature and 12 immature 

 specimens were collected during June and July, 1939. The great 

 majority of these organisms occurred within a meter of the high-tide 

 line at a depth of 12 to 16 cm. in the damp sand. Although many 

 series of intertidal sand samples were collected at Baxter's Beach, 

 Pine Orchard, Conn., between November 1937, and May 1942, this 

 form was found only during April 1940. 



ACKNOWLEDGMENTS 



The senior author carried on the field work associated with this 

 study during June and July, 1939, when he was a visiting investigator 

 at the Woods Hole Oceanographic Institution. He wishes to express 

 his gratitude to Prof. H. B. Bigelow, then director of the Institution, 

 for his kindness in providing laboratory facilities. Both authors thank 

 Prof. G. E. Hutchinson, of Yale University, for his many helpful 

 suggestions. 



LITERATURE CITED 



Monk, C. R. 



1941. Marine harpacticoid copepods from California. Trans. Amer. Microsc. 



Soc, vol. 60, pp. 75-99- 

 Pennak, R. W. 



1942a. Harpacticoid copepods from some intertidal beaches near Woods Hole, 

 Massachusetts. Trans. Amer. Microsc. Soc, vol. 61, pp. 274-285. 

 1942b. Ecology of some copepods inhabiting intertidal beaches near Woods 

 Hole, Massachusetts. Ecology, vol. 23, pp. 446-456. 

 Sars, G. O. 



1901. An account of the Crustacea of Norway, vol. 4, pp. 1-4. Bergen 



Museum. 

 1903-1911. An account of the Crustacea of Norway, vol. 5, Copepoda Har- 

 pacticoida. 449 pp. Bergen Museum. 

 ZiNN, D. J. 



1942. An ecological study of the interstitial microfauna of some marine 



sandy beaches with special reference to the Copepoda. Dissertation, 

 Yale Univ. 



