76 Bulletin Wisconsin Natural History Society [Vol. 12, Nos. 1 & 2 
Crustacea 
Balanus balanoides (Linnaeus). Abundant at all stations on rocks ; 
Mytilus shells, and other solid objects. This species (fig. 3) is found ex- 
clusively between tides. Dr. Pilsbury states that he '‘has never seen it in 
material dredged from below low-water mark.” The variety cuspidatus 
Pilsbury was collected at Station 2 on a wave swept ledge, and at Station 
9 in Swallow’s Cave. 
Calanus fimnarcMus Gunner. Abundant in the shore water on several 
occasions, especially in the morning or evening, at Stations 4, 10 and 12. 
Cyclops sp.? Abundant in some pools on rocks above high tide — often 
with Enteromorpha. 
Moina micrura Kurz. Abundant in several small pools above high tide 
mark at Station 12. 
Crago septemspinosus (Say). Abundant on the sand beach at Station 4 
and among the eel grass at Stations 13 and 14. The color usually matches 
the bottom closely, hence these shrimps probably do not migrate quickly 
from one locality to another. 
Homarus americanus Milne-Edwards. Rather common in deeper water 
off the rock beaches. 
Pagurus acadianus Benedict. Common on sand beach. Station 4, and 
on the eel grass flat. Station 13. 
Pagurus pubescens (Brandt). Not uncommon in the Chondrus Zone on 
rock beaches. 
Carcinides mcenas (Linnaeus). This species was dominant on the mud 
flats and also present in all the zones on the rock beaches. It walks with 
ease over vertical rock faces under water. On the mud flats it often bur- 
rows when the tide is out, and perhaps later walks about with a disc of mud 
covering the carapace. 
Cancer irroratus Say. Not very common, found at Stations 7, 9, 10, 13 
and 14. 
Cancer borealis Stimpson. Common on the rock beaches in the Chondrus 
Zone. Many females were carrying eggs on June 14. Four stomachs 
examined on June 23 were empty. Many of these crabs had other animals 
and algae growing on them; among these may be mentioned; Crepidula 
plana, Spirorbis spirorbis, Hydroides dianthus, Membranipora, Mytilus, 
Hildenbrandtia. 
Hyas coarctatus Leach. One individual was captured in the Ascophyllum 
at Station 1 which bore three algae — Philayella littoralis (Linn.), Ceramium 
rubrum Agassiz, and Grinnellia a^nericana Harv. — on its back. 
Orchestia grillus (Bose.). Abundant at top of sand beach at Station 4; 
also found at Station 8 under Ascophyllum. 
Talorchestia sp.? Seen on sand beach at Station 4. 
Allorchestes littoralis Stimpson. Found among Fucus and Ascophyllum 
at Stations 2, 4, and 9. 
Gamarellus angulosus (Rathke). Found under Fucus and Ascophyllum 
at low tides at Stations 2 and 8. At high tide this species often "swarmed” 
at the surface.* 
