74 Bulletin Wisconsin Natural History Society [VoL 12, Nos. 1 & 2 
Lumbriconereisf sp.? The sandy mud flats at Station 14 were filled 
with these worms. On account of an accident no specimens were preserved 
for identification. 
Bryozoa 
Flustrella hispida (Fabricius). Found in rather exposed situations 
growing on rock under algae; often encrusted Chondrus, Ascophyllum, 
and Fucus. 
Memhranipora pilosa (Linnaeus). In exposed situations on rock and 
algae. 
Hippothoa hyalina (Linnaeus). On rocks and Chondrius at Statous 7 
and 10. 
Hippothoa divaricata Lamouroux. At station 1 on Chondrus. 
Lepralia phallasiana (Moll.). At Station 5 among Ascophyllum on 
boulders. 
Echinodermata 
Henricia sanguinolenta (O. F. M.), Several collected at Station 7 in 
pools with Laminaria. 
Asterias forbesi (Desor) Verrill. More or less common at all stations 
on the rock beaches; most abundant in the Chondrus Zone. These star- 
fishes usually migrated upward somewhat with the rising tide and later 
dropped off the rock or migrated under the algae when the outgoing water 
left them exposed. Several were seen eating gastropods and Mytili. 
Although A. vulgaris is said to be common in Boston Bay (Verrill and 
Smith, 74) no individual was observed on the beaches. 
Ophiopholis aculeata (Linnaeus). In pools in Chondrus Zone at Stations 
1, 7, 8 and 9, usually among Laminarians. 
Strongylocentrotus drohachiensis Agassiz. Abundant in a clean pool 
at the bottom of a crack (6 feet wide) at Station 9; also observed at sta- 
tions 7, 8, and 10, usually in Chondrus Zone. This species is rather seden- 
tary in its habits (fig. 24). On June 23 the stomachs of several individuals 
were examined. They contained Ascophyllum in considerable quantity 
together with the nematodes, living and dead, which commonly infest the 
bladders of that alga. Balantidium, another ciliate, and small flagellates 
were common in the contents of the alimentary canal; one cast barnacle 
skin was also present. 
Ecinarachnius parma (Lamark) Gray. Common at low water mark in the 
sand at Station 4. 
Mollusca 
Chiton ruber Lowe. Taken in a pool in the Chondrus Zone at Station 9. 
Dendronotus frondrosus Ascanius. At Station 8 in Chondrus. 
Aeolidia papillosa Linnaeus. In pools in Chrondus Zone at Stations 
1, 6, and 9. 
Coryphella sp? In a pool in Swallow’s Cave, at Station 10. 
Acmaea testudinalis (Forbes and Hanley). This species was found 
on all rock beaches and was more common below the Ascophyllum zone 
