1914] 
Pearse: Fauna of the Rock Beaches 
73 
Cyanea capillata Eschscholtz. Several were cast upon the beach at 
Stations 5 and 4 on June 14 and 21. Abundant in Boston Bay on June 28. 
Metridium 7narginatum Milne-Edwards. Abundant at all stations on the 
rock beaches where it ranged from below low tide mark to the top of the 
Ascophyllum zone (fig. 25). The largest individuals, more than six inches 
in diameter, were found in the pools in the lower parts of the Chondrus 
Zone. This species is quite gregareous and a crowded colony often formed 
a veritable carpet in shallow depressions under the Ascophyllum. 
Sargartia leucolena Verrill. Not as widely distributed as the last species 
but apparently more hardy. This species was found at Stations 5, 10, and 
12. Its range was usually confined to the Ascophyllum zone though it 
often went even higher in protected cracks. 
Nemertini 
Linens viridis (Fabr.) Johnson and variety sanguinens. In pools in 
Ascophyllum zone at Station 2, in a Laminaria filled pool at Station 8; 
under Ascophyllum among boulders at Station 10. 
Amphiporus ochraceus Verrill. In a pool in Chondrus Zone at Station 10. 
Nematoda 
Enoplus cochleatus Schneider. Found at Stations 1, 5 and 7 among the 
bases of Ascophyllum and Laminaria fronds. Other species of nematodes 
were doubtless present. 
Annulata 
Professor J. P. Moore, to whom the annelids were referred for identifi- 
cation, remarks that ‘The small size of the Polychaeta is noteworthy.” 
Lepidonotus squamatus (Linnaeus). In pools Laminaria “roots” 
in the lower part of the Chondrus Zone at Stations 7, 8 and 9. 
Nereis virens Sars. Under stones at Station 14. 
Nereis pelagica Linnaeus. Among Laminaria holdfasts at Station 7. 
Nephthys caeca (Fabr.). In the ocean on the sandy beach at Station 4. 
Phyllodyce catenula Verrill. Among Laminaria holdfasts at Station 7. 
Harmothoe imbricata (Linnaeus). Among Laminaria holdfasts at Sta- 
tion 7. 
Odostomia seminuda Gould. This species was found under rocks at 
Station 10. Verrill and Smith (’14) report is as occurring at 2-10 fathoms 
in Vineyard Sound. 
Spirorbis spirorbis (Linnaeus). Found at nearly all stations in exposed 
situations, attached to Laminaria, Chondrus, to the carapaces of Cancer 
borealis and Carcinides maenas, and inside the shell of Pagurus acadianus. 
Hydroides dianthus (Verrill). On the carapace of Cancer borealis. 
Monolephorus parvus Dilersen. Very abundant on June 14 at Station 5 
where many individuals were matted together under boulders. Also 
encountered at Station 1 at the outer edge of the Ascocarpus Zone. 
Lumbricillis agilis Moore. Under Fucus on exposed rock face at Sta- 
tion 9. 
