BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 



579 



Class CTENOPHORA. 



Family MERTENSIID/E. 



Mertensia ovum (Fabricius). 



Hargitt, 1904, p. 71. 



"Only rarely taken at Woods Hole." 



Family PLEUROBRACHIID.'E. 



Pleurobrachia pilcus (Fabricius). 



Verrill and Smith, 1873, p. 722, 444, etc. (Pleu- 

 robrachia rhododacty la); Bumpus, 1898; Hargitt, 

 1904, p. 71. 



Vineyard Sound, Woods Hole Harbor, etc.; 

 sometimes abundant. This species has been 

 reported by various local observers for every 

 month in the year. According to Mr. Ed- 

 wards 's towing records it has been taken most 

 frequently in April. 



With eggs, May, 1890. J. P. McMurrich, in Ma- 

 rine Biological Labora ory card catalogue. 



Family LESUEURIID^. 



Lesueuria hyboptcra Agassi z. 



A. Agassiz, 1865, p. 23; Verrill and Smith, 1873, 



p. 722, 454; Hargitt, 1904, p. 72. 

 Newport. Agassiz. Woods Hole. Hargitt. 

 Recorded for September by Verrill, for Decem- 

 ber and January (?) by Hargitt. 



Family BOLINID^. 



Bolina alata Agassiz. 



A. Agassiz, 1865, p. 15 (no definite local records); 



Verrill, 1875, p. 42; Hargitt, 1904, p. 72. 

 Newport. Agassiz, cited by Verrill. "Seldom 



found at Woods Hole . "-Hargitt. 



Family 



Mnemiatpsis leidyi Agassiz. 



A. Agassiz, 1865, p. 20; Verrill and Smith, 1873, 

 p. 722,449; Fewkes, 1881, p. 173; 1882, p. 

 291; Bumpus, 1898; Hargitt, 1904, p. 72. 



Scarce to very abundant throughout the waters 

 of the region. Recorded by various local ob- 

 servers for every month of the year. Accord- 

 ing to Mr. Ed wards 'stowing records Alnemiop- 

 sis has been taken most frequently in Septem- 

 ber and December. This ctenophore is of very 

 irregular occurrence. During some summers it 

 is enormously abundant everywhere in local 

 waters, but in other summers (e. g., that of 

 1904) it may not be observed at all. Periods 

 of extreme abundance may likewise occur in 

 winter. (See note under Edwardsia leidyi, p. 



576.) 



Family CESTID^S. 



Cestus veneris Lesueur. 



Verrill and Smith, 1873, p. 723 ; Hargitt, 1904, p. 



73- 



Fragments of a single specimen taken at New- 

 port. Hargitt, citing A. Agassiz. 



Family BEROID^E. 



Beroe ovala Bosc. 

 Hargitt, 1904, p. 73. 



" Common at Woods Hole in 1901, though seldom 

 taken in any considerable numbers." 



Beroe cucumis Fabricius. 



Verrill and Smith, 1873, p. 723, 454, etc. (Idyia 



roseola); Hargitt, 1904, p. 73. 

 "Off Gay Head, not common"; taken in Sep- 

 tember. Verrill. Off Crab Ledge in 1902. 

 Hargitt. 



Phylum PLATYHELMINTHES. 

 Class TURBELLARIA. 



Family PLANOCERID^. 



Stylochus zebra Verrill. 



Verrill, i892b, p. 463. 



Great Harbor; on piles, and on shore , at low- water 

 mark; likewise dredged in 10 to 12 fathoms 

 Verrill. Tarpaulin Cove. Curtis. This spe- 

 cies sometimes lives commensally, within the 

 shell occupied by a hermit crab. Verrill, 

 W. C. Curtis (MS.). 



Eustylochus ellipiicus (Girard). 



Verrill and Smith, 1873, p. 632, 325 (Stylo- 



chopsis litforalis}; Verrill, i892b, p. 463. 

 Woods Hole, Vineyard Sound, Newport; common 



in shallow water and between tides, under 



stones and in tide pools, likewise on piles. 



Verrill. 

 Large clusters of eggs were found July 12. 



