BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 
579 
Class CTENOPHORA. 
Family Mertensiida3. 
Mertensia ovum (Fabricius). 
Hargitt, 1904, p. 71. 
“Only rarely taken at Woods Hole.” 
Family Pi,eurobrachiid,e. 
Pleurobrachia pileus (Fabricius). 
Verrill and Smith, 1873, p. 722, 444, etc. (Pleu- 
robrachia rhododactyla); 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 Lesueuriidze. 
Lesueuria hyboplcra Agassiz. 
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 Bolinidze. 
Bolina alaia Agassiz. 
A. Agassiz, 1865, p. 15 (no definife local records); 
Verrill, 1875, p. 42; Hargitt, 1904, p. 72. 
Newport. — Agassiz, cited by Verrill. “Seldom 
found at Woods Hole.” — Hargitt. 
Family MnemiidaJ. 
Mnemidpsis 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. Edwards’s towing records Mnemiop- 
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 CESTimE. 
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. 
Beroc ovata Bose. 
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/E. 
Stylochus zebra Verrill. 
Verrill, 1892b, 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 littoralis ); Verrill, 1892b, 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. 
